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Natural fractures and their effectiveness in deep tight sandstone reservoirs of foreland thrust belts in the southern Junggar Basin, China 认领 引用 被引量：2
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作者 Guo-Ping Liu Zhi-Jun Jin +5 位作者 Lian-Bo Zeng Xiao-Xuan Chen Mehdi Ostadhassan Zhe Mao Jian-Kang Lu Song Cao 《Petroleum Science》 SCIE EI CAS CSCD 2025年第8期3086-3100,共15页
Strong tectonic activities and diagenetic evolution encourage the development of natural fractures as typical features in deep tight sandstone reservoirs of foreland thrust belts.This study focused on the Jurassic in ... Strong tectonic activities and diagenetic evolution encourage the development of natural fractures as typical features in deep tight sandstone reservoirs of foreland thrust belts.This study focused on the Jurassic in the southern Junggar Basin to comprehensively analyze the fracture characteristics and differential distribution and,ultimately,addressed the controlling mechanisms of tectonism and diagenesis on fracture effectiveness.Results revealed that the intensity of tectonic activities determines the complexity of tectonic fracture systems to create various fracture orientations when they have been stronger.The intense tectonic deformation would impact the stratum occurrence,which results in a wide range of fracture dip angles.Moreover,as the intensity of tectonic activities and deformations weakens,the scale and degree of tectonic fractures would decrease continuously.The control of tectonism on fracture effectiveness is reflected in the notable variations in the filling of multiple group fractures developed during different tectonic activity periods.Fractures formed in the early stages are more likely to be filled with minerals,causing their effectiveness to deteriorate significantly.Additionally,the strong cementation in the diagenetic evolution can cause more fractures to be filled with minerals and become barriers to fluid flow,which is detrimental to fracture effectiveness.However,dissolution is beneficial in improving their effectiveness by increasing fracture aperture and their connectivity to the pores.These insights can refine the development pattern of natural fractures and contribute to revealing the evolutionary mechanisms of fracture effectiveness in deep tight sandstone reservoirs of foreland thrust belts. 展开更多
关键词 Natural fractures Effectiveness Tectonism and diagenesis Deep tight sandstone reservoirs Foreland thrust belts
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Structural Evolution of the Eastern Qiulitagh Fold and Thrust Belt,Northern Tarim Basin,China 认领 引用 被引量：8
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作者 YANG Minghui JIN Zhijun +4 位作者 LU Xiuxiang SUN Dongsheng TANG Xuan PENG Gengxin LEI Ganglin 《Acta Geologica Sinica(English Edition)》 SCIE CAS 2009年第2期347-358,共12页
The eastern Qiulitagh fold and thrust belt （EQFTB） is part of the active Kuqa fold and thrust belts of the northern Tarim Basin. Seismic reflection profiles have been integrated with surface geologic and drill data ... The eastern Qiulitagh fold and thrust belt （EQFTB） is part of the active Kuqa fold and thrust belts of the northern Tarim Basin. Seismic reflection profiles have been integrated with surface geologic and drill data to examine the deformation and structure style of the EQFTB, particularly the deformational history of the Dina 2 gas field. Seismic interpretations suggest that Dongqiu 8 is overall a duplex structure developed beneath a passive roof thrust, which generated from a tipline in the Miocene Jidike Formation, and the sole thrust was initiated from the same Jidike Formation evaporite zone that extends westward beneath the Kuqatawu anticline. Dongqiu 5 is a pop-up structure at the western part of the EQFTB, also developed beneath the Jidike Formation evaporite. Very gentle basement dip and steep dipping topographic slope in the EQFTB suggest that the Jidike Formation salt provides effective decoupling. The strong deformation in the EQFTB appears to have developed further south, in an area where evaporite may be lacking. Since the Pliocene, the EQFTB has moved farther south over the evaporite and reached the Yaken area. Restoring a balanced cross-section suggests that the minimum shortening across the EQFTB is more than 7800 m. Assuming that this shortening occurred during the 5.3 Ma timespan, the shortening rate is approximately 1.47 mm/year. 展开更多
关键词 Qiulitagh fold and thrust belt Tarim Basin northwestern China
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A Large-scale Tertiary Salt Nappe Complex in the Leading Edge of the Kuqa Foreland Fold-Thrust Belt, the Tarim Basin, Northwest China 认领 引用 被引量：9
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作者 TANGLiangjie JINZhijun +4 位作者 JIAChengzao PIXuejun CHENShuping XIEHuiwen WANGZiyu 《Acta Geologica Sinica(English Edition)》 SCIE EI CAS 2004年第3期691-700,共10页
The tectono-stratigraphic sequences of the Kuqa foreland fold-thrust belt in the northern Tarim basin, northwest China, can be divided into the Mesozoic sub-salt sequence, the Paleocene-Eocene salt sequence and the Ol... The tectono-stratigraphic sequences of the Kuqa foreland fold-thrust belt in the northern Tarim basin, northwest China, can be divided into the Mesozoic sub-salt sequence, the Paleocene-Eocene salt sequence and the Oligocene-Quaternary supra-salt sequence. The salt sequence is composed mainly of light grey halite, gypsum, marl and brown elastics. A variety of salt-related structures have developed in the Kuqa foreland fold belt, in which the most fascinating structures are salt nappe complex. Based on field observation, seismic interpretation and drilling data, a large-scale salt nappe complex has been identified. It trends approximately east-west for over 200 km and occurs along the west Qiulitag Mountains. Its thrusting displacement is over 30 km. The salt nappe complex appears as an arcuate zone projecting southwestwards along the leading edge of the Kuqa foreland fold belt. The major thrust fault is developed along the Paleocene-Eocene salt beds. The allochthonous nappes comprise large north-dipping faulting monoclines which are made up of Paleocene-Pliocene sediments. Geological analysis and cross-section restoration revealed that the salt nappes were mainly formed at the late Himalayan stage (c.a. 1.64 Ma BP) and have been active until the present day. Because of inhomogeneous thrusting, a great difference may exist in thrust displacement, thrust occurrence, superimposition of allochthonous and autochthonous sequences and the development of the salt-related structures, which indicates the segmentation along the salt nappes. Regional compression, gravitational gliding and spreading controlled the formation and evolution of the salt nappe complex in the Kuqa foreland fold belt. 展开更多
关键词 salt nappe structure thrust fault leading edge of the Kuqa foreland fold-thrust belt Tarim Basin
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Tectono-sedimentary Evolution of Piggy-Back Basin:Example from Kuqa Fold and Thrust Belt,Northern Tarim Basin,Northwest China 认领 引用 被引量：2
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作者 杨明慧 金之钧 +2 位作者 吕修祥 孙冬胜 曾鹏 《Journal of Earth Science》 SCIE CAS 2010年第4期412-422,共11页
The Baicheng （拜城） piggy-back basin was part of the intracontinental foreland basin system of southern Tianshan （天山） Mountains. It was formed on a thrust-and-fold belt induced by Mio-Pliocene collision between ... The Baicheng （拜城） piggy-back basin was part of the intracontinental foreland basin system of southern Tianshan （天山） Mountains. It was formed on a thrust-and-fold belt induced by Mio-Pliocene collision between southern Tianshan Mountains and Tarim craton that controlled the thick synorogenic basin fills. Sedimentological analysis and a restored cross-section based on seismic data and field studies revealed three tectono-depositional sequences of synorogenic basin fills. （1） The Lower Miocene sequence （Jidike （吉迪克 ） Formation） was formed under alluvial-braided river-lacustrine environments, in response to geodynamic changes of the Kuqa （库车） fold and thrust belt from the embryonic foreland to a foredeep in the course of orogenic loading period. （2） The Upper Miocene sequence （Kangcun （康村） Formation） was developed in fluvial-delta and lacustrine environments, within a foredeep due to orogenic thrust. （3） The Pliocene sequence （Kuqa Formation） was formed in the Baicheng piggy-back basin that became a wedge-top depozone, thrusting in the Qiulitagh （秋里塔格） thrust belt that propagated progressively southward to the Yaken （牙肯） thrust belt. 展开更多
关键词 tectono-sedimentary evolution,Mio-Pliocene blind thrust Baicheng piggy-backbasin Kuqa fold and thrust belt.
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Structural Geochemical Study of the Yuxi Fold-Thrust Belt in the Southern North China Plate 认领 引用 被引量：3
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作者 李文勇 夏斌 李东旭 《Journal of China University of Geosciences》 2006年第2期95-102,共8页
The Yuxi （豫西） fold-thrust fracture belt is part of the gigantic fold-thrust fracture belt that extends NW in the southern North China plate. The contents of major elements of tectonites were analyzed by ICP-AES. T... The Yuxi （豫西） fold-thrust fracture belt is part of the gigantic fold-thrust fracture belt that extends NW in the southern North China plate. The contents of major elements of tectonites were analyzed by ICP-AES. The analysis of chemical compositions and new stress minerals indicates： extending from the surrounding country rocks to the center of the fracture belt, the Fe2O3 content gradually increases while the FeO content gradually decreases; regular increase, decrease or peak changes are shown for chemical compositions like SiO2, Al2O3, Fe2O3, MgO, CaO, FeO, loss on ignition, TIO：, K2O, Na2 O, etc.. New stress minerals are developed for the south branch and few for the north branch. The characteristics of chemical compositions and new stress minerals of the thrust fracture demonstrate that the fracture belt has undergone a process from a closed reducing environmental system to a relatively open. oxidizing environmental system, andcompressive fractures have resulted from compression in the late stages of evolution, and the dynamothermal metamorphism and thrusting intensities are different between the south and north branches of the belt, which is strong for the south branch but relatively weak for the north branch. 展开更多
关键词 structural geochemistry thrust fracture belt Yuxi southern North China plate.
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An alternative interpretation for the map expression of "abrupt" changes in lateral stratigraphic level near transverse zones in fold-thrust belts 认领 引用
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作者 Sanghoon Kwon Gautam Mitra 《Geoscience Frontiers》 SCIE CAS 2012年第4期401-406,共6页
The map expression of ＂abrupt＂ changes in lateral stratigraphic level of a thrust fault has been traditionally interpreted to be a result of the presence of （1） a lateral （or oblique） thrust-ramp, or （2） a fro... The map expression of ＂abrupt＂ changes in lateral stratigraphic level of a thrust fault has been traditionally interpreted to be a result of the presence of （1） a lateral （or oblique） thrust-ramp, or （2） a frontal ramp with displacement gradient, and/or （3） a combination of these geometries. These geometries have been used to interpret the structures near transverse zones in fold-thrust belts （FTB）. This contribution outlines an alternative explanation that can result in the same map pattern by lateral variations in stratigraphy along the strike of a low angle thrust fault. We describe the natural example of the Leamington transverse zone, which marks the southern margin of the Pennsylvanian-Permian Oquirrh basin with genetically related lateral stratigraphic variations in the North American Sevier FTB. Thus, the observed map pattern at this zone is closely related to lateral stratigraphic variations along the strike of a horizontal fault. Even though the present-day erosional level shows the map pattern that could be interpreted as a lateral ramp, the observed structures along the Leamington zone most likely share the effects of the presence of a lateral （or oblique） ramp, lateral stratigraphic variations along the fault trace, and the displacement gradient. 展开更多
关键词 Lateral stratigraphic changes Fold-thrust belt Transverse zone Frontal ramp Lateral ramp Displacement gradient
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Petrogenesis and Tectonic Implications of the Early Triassic Nianzi Adakitic Granite Unit in the Yanshan Fold and Thrust Belt:New Constraints from U-Pb Geochronology and Sr-Nd-Hf Isotopes 认领 引用 被引量：1
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作者 ZHANG Huijun WU Chu +5 位作者 HE Fubing WANG Biren CUI Yubin LIU Zhenghua YOU Shina DONG Jing 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2024年第1期50-66,共17页
The Nianzi granite unit,which includes the Nianzi,Xiaolianghou and Xiawopu granitic intrusions,is a significant component of the northern part of the North China Craton(NCC)and is situated in the Yanshan fold and thru... The Nianzi granite unit,which includes the Nianzi,Xiaolianghou and Xiawopu granitic intrusions,is a significant component of the northern part of the North China Craton(NCC)and is situated in the Yanshan fold and thrust belt(YFTB).However,there is still debate regarding the tectonic evolutionary history of the YFTB during the late Permian to Triassic period,specifically regarding the timing of subduction and collision between the NCC and the Paleo-Asian Ocean.The Nianzi granite unit exhibits unique petrological,geochronological and geochemical signatures that shed light on the tectonic evolutionary history of the YFTB.This study presents detailed petrology,whole-rock geochemistry,together with Sr-Nd isotopic,zircon U-Pb dating and Lu-Hf isotopic data of the granites within the Nianzi granite unit.Our findings demonstrate that the granites primarily consist of subhedral K-feldspar,plagioclase,quartz,minor biotite and hornblende,with accessory titanite,apatite,magnetite and zircon.Zircon U-Pb dating indicates that the Xiaolianghou granite was emplaced at 247.5±0.62 Ma.Additionally,the adakitic characteristics of the Nianzi,Xiawopu and Xiaolianghou granitic intrusions,such as high Sr and Ba contents and high ratios of Sr/Y and(La/Yb)N,combined with negative Sr-Nd and Lu-Hf isotopes(87Sr/86Sr)i=0.705681–0.7057433,εNd(t)=−21.98 to−20.97,zirconεHf(t)=−20.26 to−9.92,as well as the I-type granite features of high SiO2,Na2O and K2O/Na2O ratios,enriched Rb,K,Sr and Ba,along with depleted Th,U,Nb,Ta,P and Ti,suggest that the Nianzi granitic unit was mainly derived from the partial melting of a thickened lower crust containing hydrous,calc-alkaline to high-K calc-alkaline,mafic to intermediate metamorphic rocks.In light of these parameters,we further integrate our data with previous studies and conclude that the Nianzi granitic unit was generated in a post-collisional extensional environment during the Early Triassic. 展开更多
关键词 tectonic evolution zircon geochronology Sr-Nd-Hf isotopes Nianzi granite unit Yanshan fold and thrust belt
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Field and geochemical characteristics of the southwestern part of Sendra Ambaji Granitoid Belt,Rajasthan,India:Implication on its petro-tectonic evolution 认领 引用
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作者 Akanksha Joshi C.Aditya +1 位作者 Divya Prakash Shubhabrata Mukhopadhyay 《Acta Geochimica》 EI CAS CSCD 2026年第3期617-638,共22页
Neoproterozoic Sendra Ambaji Granitoid forms a NE-SW trending,~360-km-long belt of intruding Mesoproterozoic metasedimentary rocks of the Delhi Supergroup along the Phulad Shear Zone in the South Delhi Fold Belt,north... Neoproterozoic Sendra Ambaji Granitoid forms a NE-SW trending,~360-km-long belt of intruding Mesoproterozoic metasedimentary rocks of the Delhi Supergroup along the Phulad Shear Zone in the South Delhi Fold Belt,northwest India.All work previously carried out on this granitoid is concentrated in the northern part of the belt,leading to difficulties in defining its petrogenesis and tectonic setting.To fill these knowledge gaps,a 350-km2 area has been mapped in the southern extent of the belt between Sayra and Dhanbari.Field characteristics such as contact relationship,structure and geochemical characteristics are considered.Field studies show the presence of multiple cogenetic gneissose and non-gneissose but crudely foliated granitoid variants,which have been mapped separately.Three phases of ductile deformation and two phases of metamorphism in amphibolite facies akin to Phulad Ophiolite Suite are observed in all the granitoid variants.Refolding of gniessosity with the second deformation is observed in the granitoids and the Phulad Ophiolite Suite.Geochemical studies indicate that these granitoids are metaluminous to peraluminous,magnesian to ferroan,high K-alkaline fractionated Ⅰ-type granitoids.Their composition is governed by partial melting of metasedimentary and mafic rocks of the continental crust at high temperature and subsequent fractionation,which has led to overlapping of S-and A-type granites on the Ⅰ-type Sendra Ambaji Granitoid.The granitoids plot in both orogenic and post-collisional or withinplate fields.These signatures corroborate the inferences reached during field work,suggesting that Sendra Ambaji Granitoids were emplaced during the waning phases of orogeny in a subduction-related Andean-type continental arc setting.However,the emplacement of the granitoids continued post-orogeny.This collisional event is correlated with the amalgamation of the Rhodinia supercontinent. 展开更多
关键词 High K-alkaline Ⅰ-type granitoids South Delhi Fold Belt Northwest India Petrogenesis Syn and post-collisional granitoids Rodinia supercontinent
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Sedimentology of Marl and Marly Limestone Sequence of Upper Cretaceous Kawagarh Formation from Northern Kalachitta Range, Attock Hazara Fold and Thrust Belt, Pakistan 认领 引用 被引量：1
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作者 Saif Ur Rehman Khalid Mehmood +4 位作者 Muhammad Fahad Ullah Naveed Ahsan Faisal Rehman Tariq Mahmood Mahboob Ahmed 《Open Journal of Geology》 CAS 2019年第1期1-14,共14页
Upper Cretaceous Kawagarh Formation is well exposed in the Attock Hazara Fold and Thrust Belt (AHFTB) and shows significant lateral and vertical variations in lithology. The present work deals with the sedimentologica... Upper Cretaceous Kawagarh Formation is well exposed in the Attock Hazara Fold and Thrust Belt (AHFTB) and shows significant lateral and vertical variations in lithology. The present work deals with the sedimentological studies of marl and marly limestone sequence of Kawagarh Formation exposed at the Bagh Neelab, Ghariala north and Sojhanda villages in Northern Kalachitta Range. Detailed petrographic studies of marly limestone and hard marl substrate show that planktons and oysters are the main skeletal constituents of studied samples and clay and detrital quartz mainly composed the non skeletal fraction. X-Ray diffraction analyses of selected marl samples confirm the petrographic data. On the basis of skeletal and non skeletal content, two microfacies—marl microfacies and Planktonic microfacies are constructed. The faunal content, their paleoecology and detrital content of microfacies suggest that marl and marly limestone sequence of Kawagarh Formation was deposited over the mid and outer ramp settings. 展开更多
关键词 Attock Hazara Fold Thrust Belt Fauna Kalachitta Range Microfacies Ramp
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Deformation, Stratigraphy, Structures and Shortening of the Zagros Fold-Thrust Belt in Southwest Iran Analysis by Restoration 认领 引用
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作者 Ehsan BARZGAR Iraj ABDOLLAHIE FARD +2 位作者 Rasoul HAMIDZADEH MOGHADAM Emadoddin ABDOLLAHIE KHALILI Aboozar GARAV 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2015年第1期105-120,共16页
A structural cross-section constructed across the Zagros Fold-Thrust Belt covering the Abadan Plain, Dezful Embayment, and Izeh Zone applied 2D and 3D seismic data, well data, surface and subsurface geological maps, s... A structural cross-section constructed across the Zagros Fold-Thrust Belt covering the Abadan Plain, Dezful Embayment, and Izeh Zone applied 2D and 3D seismic data, well data, surface and subsurface geological maps, satellite images and field reconnaissance. Besides validation and modification of the cross-section, restoration allows better understanding of the geology, structural style and stratigraphy of the Zagros basin. In the area of interest, the Hormuz basal decollement and the Gachsaran detachment play the most significant roles in the structural style and deformation of the Zagros belt. More complexity is associated with interval decollements such as Triassic evaporites, Albian shales and Eocene marls. A variety of lithotectonic units and detachment surfaces confound any estimation of shortening, which generally decreases with increasing depth. Deformation completely differs in the Abadan Plain, Dezful Embayment and Izeh Zone because of different sedimentation histories and tectonic evolution; gentle and young structures can be interpreted as pre-collisional structures of the Dezful Embayment before the Late Cretaceous. After the Late Cretaceous, the Mountain Front Fault is the main control of sedimentation and deformation in the Zagros Basin, and this completely characterizes fold style and geometry within the Dezful Embayment and the Izeh Zone. 展开更多
关键词 structural geology tectonics fold and thrust style restoration Iran
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Efectiveness and petroleum geological signifcance of tectonic fractures in the ultra‑deep zone of the Kuqa foreland thrust belt:a case study of the Cretaceous Bashijiqike Formation in the Keshen gas feld 认领 引用 被引量：19
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作者 Rong-Hu Zhang Ke Wang +2 位作者 Qing-Lu Zeng Chao-Feng Yu Jun-Peng Wang 《Petroleum Science》 SCIE EI CAS CSCD 2021年第3期728-741,共14页
The buried depth of the gas-producing reservoir in the Kuqa foreland thrust belt of the Tarim Basin exceeds 6000 m.The average matrix porosity of the reservoir is 5.5%,and the average matrix permeability is 0.128×... The buried depth of the gas-producing reservoir in the Kuqa foreland thrust belt of the Tarim Basin exceeds 6000 m.The average matrix porosity of the reservoir is 5.5%,and the average matrix permeability is 0.128×10−3μm2.In order to reveal the characteristics and efectiveness of ultra-deep fractures and their efects on reservoir properties and natural gas production,outcrops,cores,thin section,image logs and production testing data are used to investigate the efectiveness of tectonic fractures in ultra-deep reservoirs in the Kuqa foreland thrust zone,and the corresponding geological signifcance for oil and gas exploration and development are discussed.Tectonic fractures in the thrust belt include EW-trending high-angle tensile fractures and NS-trending vertical shear fractures.The former has a relatively high flling rate,while the latter is mostly unflled.Micro-fractures are usually grain-piercing-through cracks with width of 10-100 microns.In the planar view,the efective fractures are concentrated in the high part and wing zones of the long axis of the anticline,and along the vertical direction,they are mainly found in the tensile fracture zone above the neutral plane.The adjustment fracture zone has the strongest vertical extension abilities and high efectiveness,followed by the nearly EW longitudinal tensile fracture zone,and the netted fracture zone with multiple dip angles.The efectiveness of fracture is mainly controlled by fracture aperture and flling degrees.Efective fractures can increase reservoir permeability by 1-2 orders of magnitude.The higher part of the anticline is associated with high tectonic fracture permeability,which control enrichment and high production of natural gas.The netted vertical open fractures efectively communicate with pores and throats of the reservoir matrix,which forms an apparent-homogenous to medium-heterogeneous body that is seen with high production of natural gas sustained for a long term. 展开更多
关键词 Fracture efectiveness Ultra-deep Reservoir Foreland thrust belt Kuqa depression Geological signifcance
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Geochemistry,Zircon U-Pb Age and Hf Isotopic Constraints on the Petrogenesis of the Silurian Rhyolites in the Loei Fold Belt and Their Tectonic Implications 认领 引用 被引量：13
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作者 Tianyu Zhao Xin Qian Qinglai Feng 《Journal of Earth Science》 SCIE EI CAS CSCD 2016年第3期391-402,共12页
Zircon U-Pb dating, Lu-Hf isotopic and geochemical data for the Silurian rhyolites from the Loei fold belt are presented to constrain their petrogenesis and tectonic settings. The rhyolites give a weighted mean 206Pb/... Zircon U-Pb dating, Lu-Hf isotopic and geochemical data for the Silurian rhyolites from the Loei fold belt are presented to constrain their petrogenesis and tectonic settings. The rhyolites give a weighted mean 206Pb/238 U age of 423.7±2.7 Ma, and are characterized by high SiO2, Al2O3, K2 O and low MnO, MgO and P2O5. All samples are enriched in LILEs（e.g., Ba, K, Pb） and LREEs and depleted in HFSEs（e.g., Nb, Ta, Ti） with obvious negative Eu-anomalies（δEu=0.56–0.63）. The calc-alkaline rhyolites are typical arc-related rocks. The Loei rhyolites have high A/CNK ratios（1.19–1.34） and positive εHf（t）（4.03–5.38）, which can be interpreted as partial melting of juvenile crustal materials followed by multistage melting and differentiation, similar to highly fractional I-type rocks. Combined with regional geological surveys, the Loei rhyolites should be formed in a volcanic arc environment and may be in contact with the Truong Son fold belt during the Early Paleozoic. Moreover, the Simao Block might be in contiguity with the Indochina Block during Silurian. 展开更多
关键词 I-type rhyolite zircon U-Pb dating Hf isotopic composition geochemical characteristics Loei fold belt Indochina Block
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The Exhumation History of North Qaidam Thrust Belt Constrained by Apatite Fission Track Thermochronology:Implication for the Evolution of the Tibetan Plateau 认领 引用 被引量：17
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作者 CHENG Xiaogan LIN Xiubin +5 位作者 WU Lei CHEN Hanlin XIAO Ancheng GONG Junfeng ZHANG Fengqi YANG Shufeng 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2016年第3期870-883,共14页
Determining the spatio-temporal distribution of the deformation tied to the India-Eurasian convergence and the impact of pre-existing weaknesses on the Cenozoic crustal deformation is significant for understanding how... Determining the spatio-temporal distribution of the deformation tied to the India-Eurasian convergence and the impact of pre-existing weaknesses on the Cenozoic crustal deformation is significant for understanding how the convergence between India and Eurasia contributed to the development of the Tibetan Plateau. The exhumation history of the northeastern Tibetan Plateau was addressed in this research using a new apatite fission track （AFT） study in the North Qaidam thrust belt （NQTB）. Three granite samples collected from the Qaidam Shan pluton in the north tied to the Qaidam Shan thrust, with AFT ages clustering in the Eocene to Miocene. The other thirteen samples obtained from the Luliang Shan and Yuka plutons in the south related to the Luliang Shan thrust and they have showed predominantly the Cretaceous AFT ages. Related thermal history modeling based on grain ages and track lengths indicates rapid cooling events during the Eocene-early Oligocene and since late Miocene within the Qaidam Shan, in contrast to those in the Cretaceous and since the Oligocene-Miocene in the Luliang Shan and Yuka region. The results, combined with published the Cretaceous thermochronological ages in the Qaidam Shan region, suggest that the NQTB had undergo rapid exhumation during the accretions along the southern Asian Andean-type margin prior to the India-Eurasian collision. The Cenozoic deformation initially took place in the North Qaidam thrust belt by the Eocene, which is consistent with the recent claim that the deformation of the northeastern Tibetan Plateau initiated in the Eocene as a response to continental collision between India and Eurasia. The immediate deformation responding to the collision is tentatively attributed to the preexisting weaknesses of the lithosphere, and therefore the deformation of the northeastern Tibetan Plateau should be regarded as a boundary-condition-dependent process. 展开更多
关键词 apatite fission track Qaidam Shan Luliang Shan North Qaidam thrust belt Tibetan plateau
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Structural features and deformational ages of the northern Dabashan thrust belt 认领 引用 被引量：6
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作者 Pengyuan Li Jinjiang Zhang +1 位作者 Lei Guo Xiongying Yang 《Geoscience Frontiers》 SCIE CAS 2012年第1期41-49,共9页
A large-scale pop-up structure occurs at the front of the northern Dabashan thrust belt （NDTB）, bound by the NNE-dipping Chengkou fault to the south, and the SSW-dipping Gaoqiao fault to the north. The pop-up struct... A large-scale pop-up structure occurs at the front of the northern Dabashan thrust belt （NDTB）, bound by the NNE-dipping Chengkou fault to the south, and the SSW-dipping Gaoqiao fault to the north. The pop-up structure shows different features along its strike as a direct reflection of the intensity of tectonic＂ activity. To the northwest, the structure is characterized by a two-directional thrust system forming a positive flower-like structure. In contrast, the southeastern part is composed of the vertical Chengkou fault and a series of N-directed backthrusts, showing a semi-flower-like structure. We present results from Ar-Ar dating of syntectonic microthermal metamorphic sericite which show that the Chengkou fault experienced intense deformation during the mid-Mesozoic Yanshanian epoch （about 143.3 Ma）, causing rapid uplift and thrusting of the northern Dabashan thrust belt. During the propagation of this thrust, a series of backthrusts formed because of the obstruction from the frontier of Dabashan thrust belt, leading to the development of the pop-up structure. 展开更多
关键词 Northern Dabashan Thrust belt Backthrust Tectonics Pop-up structure Ar-Ar geochronology
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Differential Tectonic Deformation of the Longmen Mountain Thrust Belt,Western Sichuan Basin,China 认领 引用 被引量：9
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作者 TANG Liangjie YANG Keming +3 位作者 JIN Wenzheng WAN Guimei LüZhizhou YU Yixin 《Acta Geologica Sinica(English Edition)》 SCIE CAS 2009年第1期158-169,共12页
Field investigation and seismic section explanation showed that the Longmen Mountain Thrust Belt has obvious differential deformation： zonation, segmentation and stratification. Zonation means that, from NW to NE, th... Field investigation and seismic section explanation showed that the Longmen Mountain Thrust Belt has obvious differential deformation： zonation, segmentation and stratification. Zonation means that, from NW to NE, the Longmen Mountain Thrust Belt can be divided into the Songpan- Garz~ Tectonic Belt, ductile deformation belt, base involved thrust belt, frontal fold-thrust belt, and foreland depression. Segmentation means that it can be divided into five segments from north to south： the northern segment, the Anxian Transfer Zone, the center segment, the Guanxian Transfer Zone and the southern segment. Stratification means that the detachment layers partition the structural styles in profile. The detachment layers in the Longmen Mountain Thrust Belt can be classified into three categories： the deep-level detachment layers, including the crust-mantle system detachment layer, intracrustal detachment layer, and Presinian system basal detachment layer; the middle-level detachment layers, including Cambrian-Ordovician detachment layer, Silurian detachment layer, etc.; and shallow-level detachment layers, including Upper Triassic Xujiahe Formation detachment layer and the Jurassic detachment layers. The multi-level detachment layers have a very important effect on the shaping and evolution of Longmen Mountain Thrust Belt. 展开更多
关键词 differential deformation detachment layer segmentation stratification transfer zone,zonation Longmen Mountain Thrust Belt
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Tectonic Evolution of the Middle Frontal Area of the Longmen Mountain Thrust Belt,Western Sichuan Basin,China 认领 引用 被引量：12
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作者 JIN Wenzheng TANG Liangjie +3 位作者 YANG Keming WAN Guimei Lü Zhizhou YU Yixin 《Acta Geologica Sinica(English Edition)》 SCIE CAS 2009年第1期92-102,共11页
By analyzing the balanced cross sections and subsidence history of the Longmen Mountain thrust belt, China, we concluded that it had experienced five tectonic stages： （1） the formation stage （T3x） of the miniatur... By analyzing the balanced cross sections and subsidence history of the Longmen Mountain thrust belt, China, we concluded that it had experienced five tectonic stages： （1） the formation stage （T3x） of the miniature of Longmen Mountain, early Indosinian movement, and Anxian tectonic movement created the Longmen Mountain; （2） the stable tectonic stage （J1） where weaker tectonic movement resulted in the Longmen Mountain thrust belt being slightly uplifted and slightly subsiding the foreland basin; （3） the intense tectonic stage （J2-3）, namely the early Yanshan movement; （4） continuous tectonic movement （K-E）, namely the late Yanshan movement and early Himalayan movement; and （5） the formation of Longmen Mountain （N-Q）, namely the late Himalayan movement. During those tectonic deformation stages, the Anxian movement and Himalayan movement played important roles in the Longmen Mountain＇s formation. The Himalayan movement affected Longmen Mountain the most; the strata thrust intensively and were eroded severely. There are some klippes in the middle part of the Longmen Mountain thrust belt because a few nappes were pushed southeastward in later tectonic deformation. 展开更多
关键词 balanced cross section shortening rate subsidence history Longmen Mountain thrust belt,Sichuan basin
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Structural Styles of Longmen Mountain Thrust Belt,SW China 认领 引用 被引量：6
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作者 金文正 汤良杰 +3 位作者 杨克明 万桂梅 吕志洲 余一欣 《Journal of Earth Science》 SCIE CAS 2010年第1期19-31,共13页
Through field geological investigation and seismic interpretation of the Longmen （龙门） Mountain thrust belt, we summarized the following structural styles： thrust belt, fault-related fold （fault bend fold, fault ... Through field geological investigation and seismic interpretation of the Longmen （龙门） Mountain thrust belt, we summarized the following structural styles： thrust belt, fault-related fold （fault bend fold, fault propagation fold, and fault decollement fold）, pop-up, triangle zone, duplex, superimposed fold, ductile deformation structures, reverse thrust fault, klippe, decollement structure,etc.. These structural styles have evident distribution characteristics; they had zonation and segmentation in plane. The zonation presents as the thrust nappe tectonic zone to the west of Tongjichang （通济场） fault, fault-related folds between Tongjichang fault and Guankou （关口） fault, and low and mild folds to the east of Guankou fault. The segmentation is evidenced as the scale of reverse thrust faults was minor between Tongjichang No. 1 fault and Tongjichang No. 2 fault. The distance between these two faults became long in the Daynanbao （大园包） structure, and there developed typical fault propagation fold and pop-up between these two faults. Furthermore, the structures had stratifi-cation in profile. The salt layer of T21 provided good conditions for the formation and development of large listric thrust faults; the thrust fault slipped in the salt layer and formed decollement structures and fault-related fold. At the same time, there formed duplex and reverse thrust faults between the two decollement layers. 展开更多
关键词 Longmen Mountain thrust belt structural style duplex zonation segmentation stratification.
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Characteristics,origin and controlling effects on hydrocarbon accumulation of overpressure in foreland thrust belt of southern margin of Junggar Basin,NW China 认领 引用 被引量：9
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作者 LU Xuesong ZHAO Mengjun +4 位作者 ZHANG Fengqi GUI Lili LIU Gang ZHUO Qingong CHEN Zhuxin 《Petroleum Exploration and Development》 SCIE 2022年第5期991-1003,共13页
Aiming at the differential distribution of overpressure in vertical and lateral directions in the foreland thrust belt in the southern margin of Junggar Basin,the study on overpressure origin identification and overpr... Aiming at the differential distribution of overpressure in vertical and lateral directions in the foreland thrust belt in the southern margin of Junggar Basin,the study on overpressure origin identification and overpressure evolution simulation is carried out.Based on the measured formation pressure,drilling fluid density and well logging data,overpressure origin identification and overpressure evolution simulation techniques are used to analyze the vertical and lateral distribution patterns of overpressure,genetic mechanisms of overpressure in different structural belts and causes of the differential distribution of overpressure,and the controlling effects of overpressure development and evolution on the formation and distribution of oil and gas reservoirs.The research shows that overpressure occurs in multiple formations vertically in the southern Junggar foreland thrust belt,the deeper the formation,the bigger the scale of the overpressure is.Laterally,overpressure is least developed in the mountain front belt,most developed in the fold anticline belt,and relatively developed in the slope belt.The differential distribution of overpressure is mainly controlled by the differences in disequilibrium compaction and tectonic compression strengths of different belts.The vertical overpressure transmission caused by faults connecting the deep overpressured system has an important contribution to the further increase of the overpressure strength in this area.The controlling effect of overpressure development and evolution on hydrocarbon accumulation and distribution shows in the following aspects:When the strong overpressure was formed before reservoir becoming tight overpressure maintains the physical properties of deep reservoirs to some extent,expanding the exploration depth of deep reservoirs;reservoirs below the overpressured mudstone cap rocks of the Paleogene Anjihaihe Formation and Lower Cretaceous Tugulu Group are main sites for oil and gas accumulation;under the background of overall overpressure,both overpressure strength too high or too low are not conducive to hydrocarbon enrichment and preservation,and the pressure coefficient between 1.6 and 2.1 is the best. 展开更多
关键词 abnormally high pressure overpressure origin tectonic compression overpressure transmission hydrocarbon accumulation foreland thrust belt Junggar Basin
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Three-dimensional discrete element numerical simulation of Paleogene salt structures in the western Kuqa foreland thrust belt 认领 引用 被引量：7
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作者 LI Jianghai ZHANG Yu +1 位作者 WANG Honghao WANG Dianju 《Petroleum Exploration and Development》 SCIE 2020年第1期68-79,共12页
Taking the Paleogene salt strata in the west of Kuqa foreland thrust belt as study object, the deformation features of salt structure in the compression direction and perpendicular to the compression direction were ex... Taking the Paleogene salt strata in the west of Kuqa foreland thrust belt as study object, the deformation features of salt structure in the compression direction and perpendicular to the compression direction were examined to find out the control factors and formation mechanisms of the salt structures. By using the three-dimensional discrete element numerical simulation method, the formation mechanisms of typical salt structures of western Kuqa foreland thrust belt in Keshen and Dabei work areas were comprehensively analyzed. The simulation results show that the salt deformation in Keshen and Dabei work areas is of forward spread type, with deformation concentrated in the piedmont zone;the salt deformation is affected by the early uplift near the compression end, pre-existing basement faults, synsedimentary process and the initial salt depocenter;in the direction perpendicular to the compression direction, salt rocks near the compression end have strong lateral mobility with the velocity component moving towards the middle part, and the closer to the middle, the larger the velocity will be, so that salt rocks will aggregate towards the middle and deform intensely, forming complex folds and separation of salt structures from salt source, and local outcrop with thrust faults. Compared with 2 D simulation, 3 D simulation can analyze salt structures in the principal stress direction and direction perpendicular to the principal stress, give us a full view of the formation mechanisms of salt structures, and guide the exploration of oil and gas reservoirs related to salt structures. 展开更多
关键词 Tarim Basin Kuqa Depression foreland thrust belt salt structure three-dimensional discrete-element numerical simulation formation mechanism
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Large-scale thrusting at the northern Junggar Basin since Cretaceous and its implications for the rejuvenation of the Central Asian Orogenic Belt 认领 引用 被引量：12
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作者 Jieyun Tang Dengfa He +1 位作者 Di Li Delong Ma 《Geoscience Frontiers》 SCIE CAS CSCD 2015年第2期227-246,共20页
The Wulungu Depression is the northernmost first-order tectonic unit in the Junggar Basin. It can be divided into three sub-units： the Hongyan step-fault zone, the Suosuoquan sag and the Wulungu south slope. The Ceno... The Wulungu Depression is the northernmost first-order tectonic unit in the Junggar Basin. It can be divided into three sub-units： the Hongyan step-fault zone, the Suosuoquan sag and the Wulungu south slope. The Cenozoic strata in the basin are intact and Mesozoic-Cenozoic deformation can be observed in the Wulungu step-fault zone, so this is an ideal place to study the Mesozoic-Cenozoic deformation. By integration of fault-related folding theories, regional geology and drilling data, the strata of the Cretaceous-Paleogene systems are divided into small layers which are selected as the subjects of this research. The combination of the developing unconformity with existing growth strata makes it conceivable that faults on the step-fault zone have experienced different degrees of reactivation of movement since the Cretaceous. Evolutionary analyses of the small layers using 2D-Move software showed certain differences in the reactivation of different segments of the Wulungu Depression such as the timing of reactivation of thrusting, for which the reactivity time of the eastern segment was late compared with those of the western and middle segments. In addition the resurrection strength was similarly slightly different, with the shortening rate being higher in the western segment than in the other segments. Moreover, the thrust fault mechanism is basement-involved combined with triangle shear fold, for which a forward evolution model was proposed. 展开更多
关键词 Mesozoic-Cenozoic Thrust reactivity Wulungu depression Central Asian Orogenic Belt （CAOB）
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