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Post-earthquake landslide hazard evolution:Spatio-temporal analysis of active fault zone in Western Himalayas 认领 引用
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作者 Syed Naveed-Ul-Hasan BUKHARI Khawaja Shoaib AHMED +3 位作者 Nawaz IKRAM Nadeem Ahmad USMANI Simon SADIQ Syed Ahsan Hussain GARDEZI 《Journal of Mountain Science》 SCIE CSCD 2026年第5期2088-2110,共23页
Active faults play a critical role in controlling landslide hazards,particularly in orogenic belts such as the western Himalayas,where landslides pose a persistent threat to lives and infrastructure.This hazard became... Active faults play a critical role in controlling landslide hazards,particularly in orogenic belts such as the western Himalayas,where landslides pose a persistent threat to lives and infrastructure.This hazard became evident during and after the 2005 Kashmir earthquake,which ruptured along the Bagh-Balakot Fault(BBF).This study investigates the spatiotemporal influence of the BBF on landslide distribution from 2006 to 2024 using multi-temporal landslide susceptibility mapping and spatial analysis.Two comprehensive landslide inventories were developed for the pre-and post-decadal periods,LSI-2013(2006-2013)and LSI-2024(2014-2024),using high-resolution remote sensing and field validation.Landslide susceptibility was assessed using Logistic Regression(LR)and Random Forest(RF)models,incorporating eleven conditioning factors screened for multicollinearity using Pearson correlation and VIF analyses based on a 70/30 split of landslide and nonlandslide points into training and testing datasets.The results indicate that the RF model consistently outperformed LR,achieving higher predictive accuracies with area under the curve(AUC)values of 0.91(LSI-2013)and 0.90(LSI-2024).Maximum landslide densities of 4.0 and 2.2 landslides/km²were recorded within the 0-250 m and 250-500 m buffers of the BBF,respectively.This pronounced localized clustering remains significantly higher within 1 km along the BBF across both temporal inventories,underscoring the long-term geomorphic influence of fault activity,particularly along its northern segment.In contrast,areas distal to the fault exhibit an overall temporal decline in landslide susceptibility from 2013 to 2024,reflecting progressive post-seismic slope stabilization following the 2005 earthquake.The multi-temporal landslide susceptibility maps clearly demonstrate the persistent fault-controlled susceptibility patterns and evolving nature of landslide hazard in this region.Ultimately,this study provides comprehensive site-specific spatial guidance for landslide hazard assessment and offers insights for informed land-use planning and risk mitigation in tectonically active regions of the western Himalayas. 展开更多
关键词 Active faults Landslide susceptibility mapping Kashmir earthquake Spatio-temporal landslide inventory Bagh-Balakot Fault Western Himalayas
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Polygonal Fault Systems in the Zhongjiannan Basin of South China Sea:Geometry,Evolution and Implications 认领 引用
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作者 HU Shouxiang ZHAO Fang 《Journal of Ocean University of China》 SCIE CAS CSCD 2026年第1期184-196,共13页
Polygonal fault systems(PFS),characterized by multi-directional fault patterns within layered sequences,are well-documented features in global continental margin basins.While the geometry and formation mechanisms of P... Polygonal fault systems(PFS),characterized by multi-directional fault patterns within layered sequences,are well-documented features in global continental margin basins.While the geometry and formation mechanisms of PFS have been extensively studied in the northern South China Sea,the PFS in the Zhongjiannan Basin(western South China Sea)remain relatively unexplored,with a lack of quantitative analysis regarding their propagation.This study addresses this gap by using high-resolution three-dimensional(3D)seismic data and conducting a quantitative fault analysis to thoroughly examine the planform,cross-sectional geometry,and evolution of PFS in the northern Zhongjiannan Basin.The absence of a dominant strike direction among these polygonal faults suggests that their evolution is not controlled by anisotropic stress.Our interpretation of seismic data,constrained by the spatial relationship among PFS,gullies,and pockmarks,indicates that PFS mainly developed within the Miocene strata,with their initiation occurring during the late Miocene.Furthermore,the PFS act as key conduits connecting gullies to pockmarks in this area.The formation and development of PFS may be primarily driven by thermally triggered processes within siliceous sediments.The necessary heat source is probably associated with the abundant submarine magmatism observed in the Zhongjiannan Basin.To reconstruct the regional geological history,a four-stage evolutionary model,incorporating the formation of PFS,is presented.This research significantly improves our understanding of the regional geological evolution of the Zhongjiannan Basin,providing critical insights into the initiation and development of PFS in the western South China Sea. 展开更多
关键词 South China Sea Zhongjiannan Basin polygonal faults layer-bound faults fluid migration gullies pockmark
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Tectonic dynamics shaping the lake Hazar Basin along the East Anatolian fault system:Insights from fault kinematics and structural evolution 认领 引用
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作者 Elif AKGÜN Mustafa SOFTA 《Journal of Mountain Science》 SCIE CSCD 2026年第2期505-530,共26页
The Lake Hazar basin,located along the Palu segment of the East Anatolian Fault System(EAFS),provides a key natural laboratory for examining transtensional deformation in a major intracontinental strike-slip zone.Inte... The Lake Hazar basin,located along the Palu segment of the East Anatolian Fault System(EAFS),provides a key natural laboratory for examining transtensional deformation in a major intracontinental strike-slip zone.Integrated field mapping,fault-slip analysis,and focal mechanism inversion reveal a polyphase tectonic history involving sequential compressional,strike-slip,and extensional regimes.Rigorous discrimination of heterogeneous fault-slip datasets into homogeneous subsets enabled reconstruction of geologically consistent stress tensors and clarified the temporal transition from strike-slip to transtensional deformation.Paleostress results indicate NNE–SSW compression and NW–SE extension,consistent with present-day seismotectonic and geomorphic patterns.Variations in stress ratio Rvalues(0.26–0.57 for strike-slip;0.28–0.33 for extensional domains)and low misfit angles(<15°)reflect localized strain partitioning and reactivation of inherited faults.The Lake Hazar basin thus evolved from a pull-apart structure into a negative flower geometry through successive deformation and fault linkage.These findings highlight that discriminating polyphase fault-slip data is essential for resolving deformation dynamics in complex fault systems.The integrated structural,paleostress,and seismotectonic framework presented here refines understanding of strain localization,fault reactivation,and stress transfer along the East Anatolian Fault System. 展开更多
关键词 Palu segment East Anatolian Fault System Lake Hazar basin Paleostress Strain partitioning Fault reactivation
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Fault sealing evolution in complex fault zones of the Houxia Basin,China 认领 引用
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作者 Sujie Yan Yunwen Guan +1 位作者 Peng Wu Renhai Pu 《Energy Geoscience》 EI CAS CSCD 2026年第1期134-147,共14页
Fault sealing capacity is controlled by present-day geometry and clay content,with current research focusing on enhancing the accuracy of capacity estimates.The mechanisms for evaluating both presentday and paleo-seal... Fault sealing capacity is controlled by present-day geometry and clay content,with current research focusing on enhancing the accuracy of capacity estimates.The mechanisms for evaluating both presentday and paleo-sealing are consistent,where the current sealing capacity representing the final stage in the evolutionary process of fault sealing.To address the limitations of the conventional shale gouge ratio(SGR)in evaluating the dynamic nature of fault sealing,this study proposes a visual model for fault sealing evolution.Fault sealing evolution is jointly controlled by the burial history and clay smear history and exerts a critical influence on hydrocarbon migration and accumulation.Hydrocarbon exploration data confirm that fault sealing during and after hydrocarbon migration critically impacts reservoir preservation.If faults remain unsealed during hydrocarbon migration and accumulation,they serve solely as conduits,with their present-day sealing capacity having limited impact.Effective fault sealing thus depends on the alignment between the evolutionary sealing stages and hydrocarbon activity.Building on this framework,we propose a method to visually and quantitatively characterize the fault sealing evolution alongside hydrocarbon activity.A case study of the Xishanyao Formation in the Houxia Basin highlights that the F4 fault transitioned from being over-open to sealed at the onset of hydrocarbon migration,thereby preserving the trap,while the F8-2 fault underwent a complete sealed–reopen cycle,with the late-stage reopening leading to an absence of hydrocarbon accumulation.This temporal contrast forms the basis for a new time-sensitive methodology for assessing fault-seal integrity in complex structural settings. 展开更多
关键词 Houxia Basin Historical fault sealing Shale gouge ratio Gas reservoir preservation Geophysical modeling
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Spatiotemporal evolution of near-fielddeformation in analogue strike-slip fault models with various locked segment lengths 认领 引用
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作者 Zhandong Su Yangnong Zeng +7 位作者 Arno Zang Xiaoli Liu Jinzhong Sun Mingdong Zang Sizhe Zhou Mengyuan Li Zhiwen Wang Jianyong Zhang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第4期2653-2665,共13页
Locked segments are high-strength structural elements in fault zones that release significantseismic energy during earthquakes.In fracture mechanics,they act as high-stress concentration patches(asperities)where ruptu... Locked segments are high-strength structural elements in fault zones that release significantseismic energy during earthquakes.In fracture mechanics,they act as high-stress concentration patches(asperities)where rupture initiates.The progressive failure of locked segments along faults plays a crucial role in the energy partition of earthquakes.The impact of locked segments on the near-fielddeformation and nucleation of faults,however,remains poorly understood.In this study,rock-like materials with pre-manufactured strike-slip faults containing various locked segments lengths under uniaxial stress.The mechanical properties,local deformation fields,and slip displacement rates during the uniaxial loading of the models were quantified.Results indicate that the uniaxial compressive strength and elastic modulus of the system peak once the ratio of locked segment to fault length is approximately 0.6.Meanwhile,the resistance of the models to deformation increased,and the failure mode transformed from shear failure to tensile failure.Under loading,compression and dilatation quadrants were formed on both sides of the fault.Large-scale fractures dominate the dilatation quadrants,and the degree of deformation disturbance in this region was significantly higher than that in the compression quadrants.With increasing locked segment length,the amplitude of deformation perturbations decreased after the peak strength.Shorter locked segments were more susceptible to deformation and failure.In the fracture evolution process,a relationship between the stress deflectionangle and the displacement rate was found,which is empirically described by an exponential function.These findings clarify geological structures failure mechanisms and support seismic hazard assessment for strike-slip earthquake regions. 展开更多
关键词 Analogue strike-slip fault model Locked segment length Local deformation field Local stress deflection angle Displacement rate
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Formation and evolution of the strike-slip faults in the central Sichuan Basin, SW China 认领 引用 被引量：15
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作者 MA Bingshan LIANG Han +7 位作者 WU Guanghui TANG Qingsong TIAN Weizhen ZHANG Chen YANG Shuai ZHONG Yuan ZHANG Xuan ZHANG Zili 《Petroleum Exploration and Development》 SCIE 2023年第2期373-387,共15页
Based on 3D seismic and drilling data, the timing, evolution and genetic mechanism of deep strike-slip faults in the central Sichuan Basin are thoroughly examined by using the U-Pb dating of fault-filled carbonate cem... Based on 3D seismic and drilling data, the timing, evolution and genetic mechanism of deep strike-slip faults in the central Sichuan Basin are thoroughly examined by using the U-Pb dating of fault-filled carbonate cement and seismic-geological analysis. The strike-slip fault system was initially formed in the Late Sinian, basically finalized in the Early Cambrian with dextral transtensional structure, was overlaid with at least one stage of transpressional deformation before the Permian, then was reversed into a sinistral weak transtensional structure in the Late Permian. Only a few of these faults were selectively activated in the Indosinian and later periods. The strike-slip fault system was affected by the preexisting structures such as Nanhuanian rifting normal faults and NW-striking deep basement faults. It is an oblique accommodated intracratonic transfer fault system developed from the Late Sinian to Early Cambrian to adjust the uneven extension of the Anyue trough from north to south and matches the Anyue trough in evolution time and intensity. In the later stage, multiple inversion tectonics and selective activation occurred under different tectonic backgrounds. 展开更多
关键词 strike-slip fault fault timing fault evolution seismic-geological analysis U-Pb dating faulting mechanism cra-tonic Sichuan Basin
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Evolution and triggering mechanism of fault-slip rockbursts in deep tunnels:Insights from 3D printed large-scale physical models 认领 引用 被引量：2
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作者 Shi-Ming Mei Xia-Ting Feng +3 位作者 Zheng-Wei Li Ben-Guo He Cheng-Xiang Yang Wei Zhang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第11期6821-6836,共16页
The excavation of deep tunnels crossing faults is highly prone to triggering rockburst disasters,which has become a significant engineering issue.In this study,taking the fault-slip rockbursts from a deep tunnel in so... The excavation of deep tunnels crossing faults is highly prone to triggering rockburst disasters,which has become a significant engineering issue.In this study,taking the fault-slip rockbursts from a deep tunnel in southwestern China as the engineering prototype,large-scale three-dimensional(3D)physical model tests were conducted on a 3D-printed complex geological model containing two faults.Based on the selfdeveloped 3D loading system and excavation device,the macroscopic failure of fault-slip rockbursts was simulated indoors.The stress,strain,and fracturing characteristics of the surrounding rock near the two faults were systematically evaluated during excavation and multistage loading.The test results effectively revealed the evolution and triggering mechanism of fault-slip rockbursts.After the excavation of a highstress tunnel,stress readjustment occurred.Owing to the presence of these two faults,stress continued to accumulate in the rock mass between them,leading to the accumulation of fractures.When the shear stress on a fault surface exceeded its shear strength,sudden fault slip and dislocation occurred,thus triggering rockbursts.Rockbursts occurred twice in the vault between the two faults,showing obvious intermittent characteristics.The rockburst pit was controlled by two faults.When the faults remained stable,tensile failure predominated in the surrounding rock.However,when the fault slip was triggered,shear failure in the surrounding rock increased.These findings provide valuable insights for enhancing the comprehension of fault-slip rockbursts. 展开更多
关键词 Fault-slip rockbursts Evolution mechanism 3D printing Large-scale physical model test Deep tunnel
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Evaluation index and evolution law of fault sealing in caprock above depleted reservoir 认领 引用
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作者 Kai Zhao Xiaoyun Wang +4 位作者 Wenjie Song Zhihui Xu Shuyi Shi Simin Zhang Chenxi Yang 《International Journal of Coal Science & Technology》 SCIE EI CAS CSCD 2025年第3期180-206,共27页
In the process of oil and gas production,reservoir pressure depletion leads to changes in pore pressure and in-situ stress in caprock,which may reactivate closed faults in caprock,break the sealing of caprock,and make... In the process of oil and gas production,reservoir pressure depletion leads to changes in pore pressure and in-situ stress in caprock,which may reactivate closed faults in caprock,break the sealing of caprock,and make depleted oil and gas reservoirs unsuitable for gas storage.In order to effectively evaluate the sealing of faults in caprock above depleted reservoir and provide a basis for a reasonable selection of injection time and location for gas storage,this paper comprehensively considers fault slip potential(FSP)and fault tensile potential(FTP),and establishes a fault sealing evaluation model in caprock above depleted reservoir.The influences of distance of fault from reservoir top,reservoir pressure depletion degree,cap mechanical property,fault occurrence,fault frictional property and in-situ stress anisotropy in caprock on different types of FSP and FTP are analyzed.The results show that for normal faults,reverse faults,and strike-slip faults,FTP increases with reservoir depletion and does not cause tensile failure,among which FTP is the smallest for normal faults.FSP is the key to controlling fault sealing in caprock above depleted reservoir.For reverse faults and strike-slip faults,in the early stage of reservoir depletion,the FsP is larger when the fault is farther away from the top of the reservoir,while normal faults are the opposite.When the normal fault is closer to the top of the reservoir,the cap poisson ratio is smaller,the Biot's coefficient is larger,the internal friction coefficient of the fault is smaller,the inherent shear strength of the fault is smaller,σH/σv is smaller,σh/σv is smaller,45°<β<75°,α=0° or α=180°,the FSP is larger with the reservoir depletion,and the shear failure of the fault is the most likely.At this time,the reservoir pressure should be strictly controlled not to be too small,so that it can be suitable for the construction of gas storage.Under other conditions,the possibility of shear failure of the caprock is less.For reverse faults and strike-slip faults,when is smaller,the FSP decreases first and then increases with reservoir depletion.Although the possibility of shear failure decreases in the initial stage of reservoir depletion,it increases in the later stage.The research results can provide a theoretical basis for the reconstruction of underground gas storage. 展开更多
关键词 Reservoir depletion Evaluation index Caprock Fault sealing Evolution law
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Intricate Fault Systems in Longmenshan Structural Belt's Northern End:Exploring Structural Evolution and Seismic Rupture Behavior in the Eastern Tibetan Plateau 认领 引用
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作者 Hanyu Huang Renqi Lu +3 位作者 Dengfa He Jinliang Gao Weikang Zhang Lingyu Kang 《Journal of Earth Science》 SCIE CAS CSCD 2025年第1期250-265,共16页
The Longmenshan structural belt on the eastern edge of the Tibetan Plateau experienced the impactful Mw7.92008 Wenchuan Earthquake,causing a 350 km surface rupture.Traditional models attribute this to the Beichuan and... The Longmenshan structural belt on the eastern edge of the Tibetan Plateau experienced the impactful Mw7.92008 Wenchuan Earthquake,causing a 350 km surface rupture.Traditional models attribute this to the Beichuan and Pengguan faults,but our research reveals a complex fault system at the northern end,with inconsistencies in surface rupture,aftershock distribution,and focal mechanisms.We integrate shallow geology,active source seismic reflection,and magnetotelluric profiling to establish a deep structural model for the northern end of the Longmenshan structural belt.This area exhibits dominant reverse thrust nappe tectonics,and analyzing the tectonic evolution history provides insights into deformation propagation from the orogenic belt toward the Sichuan Basin.Focal mechanism analysis and relocated aftershock data reveals two distinct types of seismogenic structures in the northern end of the Longmenshan structural belt.In the middle to northern segments,the reverse fault type is attributed to reactivated pre-existing faults.Conversely,at the northern end,the strike-slip fault type originates from high-angle co-seismic rupture cutting through pre-existing reverse faults.This study enhances our understanding of fault complexity and seismic mechanisms in the northeastern Longmenshan structural belt,providing new insights into regional tectonics. 展开更多
关键词 Longmenshan structural belt fault system structural evolution tectonics earthquakes focal mechanism
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Deciphering tectonic uplift and landscape evolution through geomorphic indices:insights into low-and high-angle fault interactions in the BozdağHigh,Western Anatolia 认领 引用 被引量：1
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作者 Semih ESKİ Hasan SÖZBİLİR Çiğdem TEPE 《Journal of Mountain Science》 SCIE CSCD 2025年第6期2111-2144,共34页
The BozdağHigh is a metamorphic core complex located between the Gediz(Alaşehir)and Küçük Menderes grabens in the Western Anatolia Extensional Province.The region is structurally controlled by low-angle... The BozdağHigh is a metamorphic core complex located between the Gediz(Alaşehir)and Küçük Menderes grabens in the Western Anatolia Extensional Province.The region is structurally controlled by low-angle Gediz Detachment Faults(GDF)and high-angle normal faults,which play a fundamental role in its geomorphological evolution.Understanding how these fault systems interact to shape uplift,drainage reorganization,and landscape dynamics remains an open scientific question.This study utilizes GIS-based morphometric analyses of 53 drainage basins and mountain fronts to quantify the spatial variations in uplift and fault activity.By integrating geomorphic indices(e.g.,χ-index,ksn,Smf,Vf)with analytical hierarchy process(AHP)models,we assess relative tectonic activity and investigate the kinematic evolution of fault-bounded blocks.Our findings reveal that the BozdağHigh experienced distinct rotational phases before and after the activation of high-angle faults,transitioning from an initial detachment-dominated extensional system to a segmented fault network.Additionally,BozdağHigh exhibits contrasting tectonic activity between its northern and southern flanks.While the northern flank,facing the Gediz Graben,experiences higher uplift rates and stronger tectonic forcing,the southern flank,adjacent to the Küçük Menderes Graben,exhibits relatively subdued tectonic activity and increased erosional modification.The western section of the eastern flank shows a more rapid uplift trend toward the east,whereas the southern flank displays significant surface tilting.Geomorphic evidence suggests that sequential fault activity and strain partitioning control differential uplift,drainage divide migrations,and basin asymmetry.Asymmetric basins in the southern sector,characterized by high hypsometric integral(HI)and low normalized steepness index(ksn)values,suggest a balance between erosional processes and tectonic uplift.In contrast,regions with ongoing rapid uplift exhibit higher ksn values and active knickpoint formation.These results provide new insights into the interaction between lowand high-angle fault systems and contribute to the broader understanding of tectonic evolution in extensional provinces.These new insights include the identification of spatially variable uplift and rotation patterns caused by sequential activation of low-and high-angle faults,revealing how block tilting and strain partitioning have shaped drainage reorganization and landscape evolution in the BozdağHigh. 展开更多
关键词 Gediz Graben BozdağHigh Gediz Detachment Fault Tectonic geomorphology Active faulting
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Tectonic evolution and its control over deposition in fault basins: A case study of the Western Sag of the Cenozoic Liaohe Depression, eastern China 认领 引用 被引量：4
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作者 Zhang Zhen Bao Zhidong +2 位作者 Tong Hengmao Wang Yong Li Haowu 《Petroleum Science》 SCIE CAS CSCD 2013年第3期269-281,共13页
The main petroliferous basins in eastern China are Cenozoic fault basins, most of which have experienced two-stage tectonic evolution, i.e., rifting subsidence in the Paleogene and post-rifting thermal subsidence in t... The main petroliferous basins in eastern China are Cenozoic fault basins, most of which have experienced two-stage tectonic evolution, i.e., rifting subsidence in the Paleogene and post-rifting thermal subsidence in the Neogene-Quaternary. The episodic tectonic evolution and syndepositional faulting had significant influence on the fault basins in terms of accommodation space, deposition rate, and depositional facies zones. In this study, the tectonic deformation characteristics and the tectonic-depositional evolution of the Western Sag of the Cenozoic Liaohe Depression were investigated by comprehensive analysis of the available geological and geophysical data using the modern theory of tectonic geology and the balanced section technique. The tectonic deformation of the Cenozoic fault basin was characterized by superimposed faults and depression. In addition, there existed relatively independent but still related extensional tectonic systems and strike-slip tectonic systems. The tectonic evolution of the fault basin involved five stages, i.e., initial rifting stage （E2s4）, intense faulting stage （E2s3）, fault-depression transition stage （E3sl2）, differential uplifting stage （E3d）, and depression stage （N-Q）. According to the characteristics of tectonic development and evolution of the Western Sag, the depositional evolution in the Cenozoic fault basin was divided into two stages, i.e., multi-episodic rifting filling in the Paleogene and post-rifting filling in the Neogene-Quaternary. The former rifting stage was further subdivided into four episodes with different characteristics of depositional development. The episodic faulting controlled the filling process and filling pattern of the Cenozoic Western Sag as well as the development and spatial distribution of associated depositional systems, whereas the syndepositional faults that developed in multiple stages in various tectonic positions controlled the development of depositional systems and sand bodies in the Western Sag. That is, the fault terraces on steep slopes controlled the development of sand bodies, the fault terraces on gentle slopes controlled the development of low-stand fan bodies, and the fault terraces or fault troughs in the central basin controlled the development of fluxoturbidite bodies. 展开更多
关键词 Fault basin syndepositional fault tectonic evolution depositional evolution Western Sag
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Origin and Evolution Process of Overpressure in the Shahezi Formation of Xujiaweizi Fault Depression in the Northern Songliao Basin,NE China 认领 引用 被引量：1
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作者 ZHANG Chengju JIANG Zhenxue +7 位作者 LU Jiamin SHI Lidong BI Zhongyu SUN Lidong YANG Liang LI Xiaomei LIU Jiajun MIAO Huan 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2025年第1期212-227,共16页
It is of great significance for deep oil and gas exploration to understand the origin and evolution behind overpressure.Overpressure occurs in the deep Shahezi Formation of Xujiaweizi fault depression.However,due to l... It is of great significance for deep oil and gas exploration to understand the origin and evolution behind overpressure.Overpressure occurs in the deep Shahezi Formation of Xujiaweizi fault depression.However,due to limited degree of exploration,there are some problems in the study area,such as unclear understanding of the origin of overpressure and the vague investigation of overpressure evolution.To clarify the impact of overpressure on oil and gas migration and accumulation in the study area,this study focuses on the research of the origin and evolution of overpressure in the Shahezi Formation of the study area,utilizing single well logging parameters and combining methods such as microthermometry of fluid inclusions,laser Raman spectrum,and basin simulation.The results show that the overpressure of the Shahezi Formation in Xujiaweizi fault depression is primarily generated by hydrocarbon generation pressurization,and the evolution of overpressure is closely related to hydrocarbon generation.The development of overpressure can be divided into two evolutionary stages:early hydrocarbon generation pressurization and late uplift release,with slight variations in different regions.Tight glutenite gas reservoirs in the Shahezi Formation are characterized by continuous charging.The overall charging period ranges from the late Denglouku to the early Mingshui(110-67 Ma ago).There is an obvious paleo-overpressure during the gas reservoir formation period.The gas generation period of source rocks occurred approximately 125-60 Ma ago,and the main gas generation period(112-67 Ma ago)highly coincides with the period of natural gas charging.The anomalously high pressure during the accumulation period is considered the significant driving force for natural gas charging.In addition,the sustained effect of overpressure provides better conditions for the preservation of tight gas reservoirs within the source.The results of the study are of guiding significance for the in-depth exploration and development of deep tight sandstone gas in the Shahezi Formation of Xujiaweizi fault depression. 展开更多
关键词 fluid inclusion laser Raman spectrum basin simulation overpressure genesis paleo-pressure recovery Shahezi Formation Xujiaweizi fault depression
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Tectonic Evolution of the Ailao Shan-Red River Fault since the Middle Miocene from Apatite Fission Track Thermochronology and its Implications for Tibetan Plateau Growth 认领 引用
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作者 GONG Wei LI Chaoyang +4 位作者 JIANG Liang WANG Yuyan LI Hongyu ZHAO Lihong ZHAO Faqiang 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2025年第1期126-143,共18页
The temporal and spatial evolution of the Ailao Shan-Red River(ASRR)fault zone,which serves as an important accommodation zone for the extrusion and escape of the Southeastern Tibetan Plateau,is crucial for analyzing ... The temporal and spatial evolution of the Ailao Shan-Red River(ASRR)fault zone,which serves as an important accommodation zone for the extrusion and escape of the Southeastern Tibetan Plateau,is crucial for analyzing the uplift and growth of the plateau.Based on the petrology and apatite fission track analysis,the tectonic history and active pattern of the ASRR fault zone since the middle Miocene are determined in this study.The ASRR fault zone exhibits 12-8Ma and 8-4 Ma rapid cooling phases since the middle Miocene.The 12-8 Ma and 8-4 Ma cooling may imply that the dextral movement of the ASRR fault zone presents a migration trend from northwest to southeast,accompanied by the weakening of the activity intensity,which is directly related to deformation processes,including extrusion boundary migration and active tectonic movements of the southeastern Tibetan Plateau,since the middle-late Miocene. 展开更多
关键词 apatite fission track extrusion tectonics middle Miocene Ailao Shan-Red River fault zone Tibetan Plateau
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Decomposition and Evolution of Intracontinental Strike-Slip Faults in Eastern Tibetan Plateau 认领 引用 被引量：8
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作者 YAO Qi XU Xiwei +2 位作者 XING Huilin XU Chong WANG Xiaohui 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2013年第2期304-317,共14页
Little attention had been paid to the intracontinental strike-slip faults of the Tibetan Plateau. Since the discovery of the Longriba fault using re-measured GPS data in 2003, an increasing amount of attention has bee... Little attention had been paid to the intracontinental strike-slip faults of the Tibetan Plateau. Since the discovery of the Longriba fault using re-measured GPS data in 2003, an increasing amount of attention has been paid to this neglected fault. The local relief and transverse swath profile show that the Longriba fault is the boundary line that separates the high and flat tomography of the Tibet plateau from the high and precipitous tomography of Orogen. In addition, GPS data shows that the Longriba fault is the boundary line where the migratory direction of the Bayan Har block changed from eastward to southeastward. The GPS data shows that the Longriba fault is the boundary fault of the sub-blocks of the eastern Bayan Har block. We built three-dimensional models containing the Longriba fault and the middle segment of the Longmenshan fault, across the Bayan Har block and the Sichuan Basin. A nonlinear finite element method was used to simulate the fault behavior and the block deformation of the Eastern Tibetan Plateau. The results show that the low resistivity and low velocity layer acts as a detachment layer, which causes the overlying blocks to move southeastward. The detachment layer also controls the vertical and horizontal deformation of the rigid Bayan Har block and leads to accumulation strain on the edge of the layer where the Longmenshan thrust is located. After a sufficient amount of strain has been accumulated on the Longmenshan fault, a large earthquake occurs, such as the 2008 Wenchuan earthquake. The strike slip activity of the Longriba fault, which is above the low resistivity and low velocity layer, partitions the lateral displacements of the Bayan Har block and adjusts the direction of motion of the Bayan Har block, from the eastward moving Ahba sub-block in the west to southeastward moving Longmenshan sub-block in the east. Four models with different depths to the Longriba fault were constructed： （1） a shallow fault with a depth of only 4 km, （2） a deeper fault that is half as deep as the Longmenshan fault, （3） a deep fault that is 2 km shallower than the low resistivity and low velocity layer, and （4） a fault that is as deep as the low resistivity and low velocity layer. The activity and influence of the Longriba fault with different development stage under this tectonic system were shown： in one Earthquake recurrence period, the rupture region of the fault increases with the depth of the fault, and the lateral slip partition by the fault also changes with the fault depth. It suggests that the Longriba fault is a newly generated fault that developed after the quick uplift in Late Cenozoic along this tectonic setting and gradually extended from the northwest to southeast. The calculations provide the characteristic of block deformation and fault behaviors of intra-continental strike-slip fault and major boundary thrust faults in the eastern margin of the Tibet plateau. Although the low resistivity and low velocity layer controls the deformation of the Bayan Hat block and the uplift of the Longmenshan thrust, the partition of the Longriba fault has an important influence on the intra-plate deformation and modern geomorphic evolution. 展开更多
关键词 Bayan Har block Longmenshan thrust fault Longriba fault intracontinental fault,nonlinear friction
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Factors controlling the formation and evolution of source rocks in the Shahezi Formation,Xujiaweizi fault depression,Songliao Basin 认领 引用 被引量：2
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作者 Xiang Zhou Lidong Sun 《Energy Geoscience》 EI 2023年第2期1-16,共16页
The types and quality of source rocks in the Shahezi Formation are the key factors affecting the distributions of various deep gas reservoirs in the Xujiaweizi fault depression in Songliao Basin.To clarify the quality... The types and quality of source rocks in the Shahezi Formation are the key factors affecting the distributions of various deep gas reservoirs in the Xujiaweizi fault depression in Songliao Basin.To clarify the quality differences and origins of different types of source rocks in the Shahezi Formation,this study reconstructed the sedimentary and water environment,determined the controlling effects of fault activity,sedimentary facies,and paleo-sedimentary environment on the quality of various source rocks,by making full use of seismic,logging,core,organic geochemical and element geochemical analysis.The results show that two types of source rocks developed in the Shahezi Formation,namely,mudstones and coals.The mudstones have a relatively high abundance of organic matter,which consists of type-Ⅱ kerogen and partial type-Ⅲ kerogen,and are concentrated in Sha-I Member.The coals have a high abundance of organic matter,which consist of type-Ⅲ kerogen,and are mainly distributed in Sha-Ⅱ Member.During the deposition of Sha-I Member,intense fault activity formed arrow,deep-water lacustrine basins with high salinity and strong reducibility on the downthrow sides of faults.During the deposition of Sha-II Member,fault activity progressively weakened,and the areas of lacustrine basins enlarged to their maximum values and became wide,shallow-water basins with low salinity and low reducibility.The development of source rocks was controlled by fault activity,sedimentary facies,and paleo-sedimentary environment.Fault activity formed accommodation space on the downthrown sides of faults for mudstone accumulation,thus determining mudstone thickness.The sedimentary environment controlled the organic matter input and determined the distribution of mudstones and coals.The paleo-sedimentary environment,which consisted of paleo-salinity,as well as paleo-water depth and redox conditions,affected the accumulation and preservation of organic matter and is the main controlling factor for the quality difference of various source rocks in the Shahezi Formation. 展开更多
关键词 Fault Paleo-environment evolution Source rock Deep gas reservoirs Shahezi Formation Xujiaweizi fault depression
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Sequential Fault Diagnosis Using an Inertial Velocity Differential Evolution Algorithm 认领 引用 被引量：5
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作者 Xiao-Hong Qiu Yu-Ting Hu Bo Li 《International Journal of Automation and computing》 CSCD 2019年第3期389-397,共9页
The optimal test sequence design for fault diagnosis is a challenging NP-complete problem.An improved differential evolution(DE)algorithm with additional inertial velocity term called inertial velocity differential ev... The optimal test sequence design for fault diagnosis is a challenging NP-complete problem.An improved differential evolution(DE)algorithm with additional inertial velocity term called inertial velocity differential evolution(IVDE)is proposed to solve the optimal test sequence problem(OTP)in complicated electronic system.The proposed IVDE algorithm is constructed based on adaptive differential evolution algorithm.And it is used to optimize the test sequence sets with a new individual fitness function including the index of fault isolation rate(FIR)satisfied and generate diagnostic decision tree to decrease the test sets and the test cost.The simulation results show that IVDE algorithm can cut down the test cost with the satisfied FIR.Compared with the other algorithms such as particle swarm optimization(PSO)and genetic algorithm(GA),IVDE can get better solution to OTP. 展开更多
关键词 Differential evolution(DE) evolutionary computation fault isolation rate(FIR) testability fault diagnosis
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The Cenozoic activities of Yangjiang-Yitongdong Fault: insights from analysis of the tectonic characteristics and evolution processes in western Zhujiang(Pearl) River Mouth Basin 认领 引用 被引量：14
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作者 Yuhan Li Rongwei Zhu +2 位作者 Hailing Liu Xuelin Qiu Haibo Huang 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2019年第9期87-101,共15页
The Yangjiang-Yitongdong Fault (YJF) is an important NW-trending regional fault, which divides the Zhujiang (Pearl) River Mouth Basin (ZRMB) into western and eastern segments. In Cenozoic, the northern continental mar... The Yangjiang-Yitongdong Fault (YJF) is an important NW-trending regional fault, which divides the Zhujiang (Pearl) River Mouth Basin (ZRMB) into western and eastern segments. In Cenozoic, the northern continental margin of the South China Sea (SCS) underwent continental rifting, breakup, seafloor spreading and thermal subsidence processes, and the Cenozoic activities of YJF is one part of this series of complex processes. Two long NW-trending multichannel seismic profiles located on both sides of the YJF extending from the continental shelf to Continent-Ocean Boundary (COB) were used to study the tectonic and sedimentary characteristics of western ZRMB. Using the 2D-Move software and back-stripping method, we constructed the balance cross-section model and calculated the fault activity rate. Through the comprehensive consideration of tectonic position, tectonic evolution history, featured structure, and stress analysis, we deduced the activity history of the YJF in Cenozoic. The results showed that the YJF can be divided into two segments by the central uplift belt. From 65 Ma to 32 Ma, the YJF was in sinistral motion as a whole, inherited the preexisting sinistral motion of Mesozoic YJF, in which, the southern part of YJF was mainly in extension activity, controlling the formation and evolution of Yunkai Low Uplift, coupled with slight sinistral motion. From 32 Ma to 23.8 Ma, the sinistral motion in northern part of YJF continued, while the sinistral motion in southern part began to stop or shifted to a slightly dextral motion. After 23.8 Ma, the dextral motion in southern part of YJF continued, while the sinistral motion in northern part of YJF gradually stopped, or shifted to the slightly dextral motion. The shift of the YJF strike-slip direction may be related to the magmatic underplating in continent-ocean transition, southeastern ZRMB. According to the analysis of tectonic activity intensity and rift sedimentary structure, the activities of YJF in Cenozoic played a regulating role in the rift extension process of ZRMB. 展开更多
关键词 Yangjiang-Yitongdong Fault Zhujiang (Pearl) River Mouth Basin tectonic evolution strike slip movement Cenozoic
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Tectonic Characteristics, Evolution, and Significance of the Zhouwang Fault, Lower Yangtze Area, Eastern China 认领 引用 被引量：5
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作者 ZHANG Gang CHEN Guangtao +4 位作者 REN Shenglian GE Can LIN Shoufa SONG Chuanzhong LI Longming 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2022年第2期460-476,共17页
Fault geometry, kinematics, geophysics, the tectonic stress field and tectonic evolution of the Zhouwang fault in the southern Jiangnan tectonic transition zone of the Lower Yangtze region, eastern China are examined.... Fault geometry, kinematics, geophysics, the tectonic stress field and tectonic evolution of the Zhouwang fault in the southern Jiangnan tectonic transition zone of the Lower Yangtze region, eastern China are examined. Field observations show the fault is composed of a series of nearly E–W trending, N–S dipping faults, and four stages of tectonism(sinistral strike-slip, thrust nappe, normal fault, and dextral strike-slip) developed in turn. Geophysical data show that the fault trends almost linearly E–W along a flat, steep gravity gradient at shallow depth, with distinct gravity anomalies to the north and south and different in the north and south. Also, the deep part is characterized by northward dip and a gradual slowing down. Tectonic stress field analysis indicates that the fault experienced four tectonic movements: NNE–SSW compression, NNW–SSE compression, NEE–SWW extension, and E–W compression. Combined with regional tectonic background and previous research results, this indicates that:(1) the Zhouwang fault experienced sinistral strike-slip movement during the Indosinian Period(260–200 Ma);(2) thrust nappes developed during the early Yanshanian Period(163–145 Ma);(3) a normal fault occurred in the late Yanshanian Period(125–65 Ma);and(4) dextral strike-slip movement occurred in the Himalayan Period(ca. 50–37 Ma). The results reveal the tectonic evolution of the fault during Mesozoic deformation in the area, and also reveal the geological evolution and tectonic transformation of the Lower Yangtze region, which is key to our understanding of intracontinental deformation in eastern China. 展开更多
关键词 bouguer gravity anomaly stress field tectonic evolution Zhouwang fault Lower Yangtze
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The formation and evolution of the Qiaojia pull-apart basin,North Xiaojiang Fault Zone,Southwest China 认领 引用 被引量：5
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作者 LI Tian-tao PEI Xiang-jun +1 位作者 HUANG Run-qiu JIN Long-de 《Journal of Mountain Science》 SCIE CSCD 2016年第6期1096-1106,共11页
Sedimentary sequences with drastic thickening over short distances have been observed in Qiaojia County,Yunnan Province,Southwest China.These are related to a pull-apart basin controlled by the Xiaojiang strike-slip f... Sedimentary sequences with drastic thickening over short distances have been observed in Qiaojia County,Yunnan Province,Southwest China.These are related to a pull-apart basin controlled by the Xiaojiang strike-slip fault.Our field investigations include determining the surface characteristics of the Qiaojia basin which consists of three terrace sequences and a series of alluvial fans.Several drill holes were used to reveal the internal structure of the basin.The results suggest that the basinal sediments are over 300 m thick.From bottom to top,they can be classified into five different units.We inferred that the units of lacustrine sediments are deposited in a paleolake which was formed by a paleo-landslide.Accelerator mass spectrometry radiocarbon dating(AMS 14C dating) was used to estimate the ages of the terrace and lacustrine sediments.We use the results to infer that the paleo-lake has existed about 15,000 years and that the Qiaojia basin was uplifted at an average rate of 3.3 mm/a.Furthermore,we then model the evolution process of the basin and interpreted 6 phases of development. 展开更多
关键词 Pull-apart basin Xiaojiang fault Strike-slip Evolution Terrace Dammed lake
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Fault Reconfiguration of Shipboard Power System Based on Triple Quantum Differential Evolution Algorithm 认领 引用 被引量：5
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作者 王丛佼 王锡淮 +2 位作者 肖健梅 陈晶 张思全 《Journal of Shanghai Jiaotong university(Science)》 EI 2016年第4期433-442,共10页
Fault reconfiguration of shipboard power system is viewed as a typical nonlinear and multi-objective combinatorial optimization problem. A comprehensive reconfiguration model is presented in this paper, in which the r... Fault reconfiguration of shipboard power system is viewed as a typical nonlinear and multi-objective combinatorial optimization problem. A comprehensive reconfiguration model is presented in this paper, in which the restored loads, switch frequency and generator efficiency are taken into account. In this model, analytic hierarchy process(AHP) is proposed to determine the coefficients of these objective functions. Meanwhile, a quantum differential evolution algorithm with triple quantum bit code is proposed. This algorithm aiming at the characteristics of shipboard power system is different from the normal quantum bit representation. The individual polymorphic expression is realized, and the convergence performance can be further enhanced in combination with the global parallel search capacity of differential evolution algorithm and the superposition properties of quantum theory. The local optimum can be avoided by dynamic rotation gate. The validity of algorithm and model is verified by the simulation examples. 展开更多
关键词 quantum differential evolution algorithm ternary coding dynamic rotation gate shipboard power system fault reconfiguration
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