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Insights into the evolution of pore structure and novel stress sensitivity determination of porosity-permeability in unconventional rocks 认领 引用
1
作者 Heng Wang Chun-Yu He +4 位作者 Yu-Chen Xin Hai-Yan Zhu Zhi-Wu Li Vladimir Alvarado Lei Wang 《Petroleum Science》 SCIE EI CAS CSCD 2026年第1期317-331,共15页
The sensitivity of petrophysical parameters such as porosity and permeability to stress conditions is critical in unconventional reservoir management.Calculation of these dependencies on stress conditions that arise d... The sensitivity of petrophysical parameters such as porosity and permeability to stress conditions is critical in unconventional reservoir management.Calculation of these dependencies on stress conditions that arise during oil and gas production operations remains a challenge,and despite its importance,is still poorly understood.This study focuses on the quantification of stress-dependent porosity and permeability evolution based on pore size distributions,and validation of the proposed model.To better understand the pore structure dynamic evolution and link it to rock properties,i.e.pore type,shape,and mineral composition,two tight sandstone and two shale rock samples were characterized.First,samples were assessed via Field Emission-Scanning Electron Microscopy(FE-SEM).Then,porosity and permeability were measured at different confining pressures.As proxy for the pore structure,the pore-size distribution(PSD)was determined via interpretation of the nuclear magnetic resonance(NMR)T2 distribution.Results show that porosity and permeability decrease as the effective stress is increased,as anticipated.The detailed analysis shows that this dependence is dominated by the percentage of clay and organic matter,and the initial microstructure.Here,we proposed a connection between rock microstructure and petrophysical properties that relies on PSD,which in turn connects the T2 distributions to stress-dependent porosity and permeability.The proposed stress sensitivity model that accounts for changes in PSD agrees well with the experimental data,better than predictions using other models.Our findings contribute to the understanding of dynamic rock petrophysical evolution and the response to the pore/fracture deformation with the adjustment of stress in subsurface activities. 展开更多
关键词 Stress sensitivity model Pore structure Porosity Permeability T2distribution Deformation mechanism
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Reconstruction of pore structure and transformation of failure mode in reef limestone under MICP grouting 认领 引用
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作者 Wenxi Zhu Huafeng Deng +5 位作者 Linjian Ma Mingyang Wang Yao Xiao Hongya Li Lei Cheng Wenlong Yu 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第4期793-810,共18页
Given the high porosity,strong connectivity,and low strength of reef limestone,microbial-induced carbonate precipitation(MICP) reinforcement tests were performed under different grouting cycles.CTbased three-dimension... Given the high porosity,strong connectivity,and low strength of reef limestone,microbial-induced carbonate precipitation(MICP) reinforcement tests were performed under different grouting cycles.CTbased three-dimensional reconstruction,uniaxial compression,and acoustic emission analyses were employed to elucidate the coupling mechanism between microstructural evolution and macroscopic mechanical behavior.MICP-induced calcium carbonate deposition exhibited distinct scale selectivity,initially occurring in large pores and highly coordinated nodes,which reduced the average pore diameter from 221.26 μm to 75.36 μm and transformed the pore network from a highly connected loose type to a dense isolated one.The elastic modulus increased from 3.27 GPa to 6.21 GPa,and the peak strength approximately doubled,while the failure mode evolved from brittle to brittle–ductile.Acoustic emission analysis revealed a greater proportion of post-peak high-energy events and a frequency shift from high to mid–low ranges,indicating a multi-stage energy dissipation process.A reinforcement variable was introduced to quantify the MICP-induced strengthening,and a structural densification factor was incorporated to establish a constitutive model governed by densification.The study clarifies the coupling mechanism from microscopic densification to macroscopic enhancement,providing theoretical support for the green reinforcement of highly porous rock masses. 展开更多
关键词 Reef limestone MICP Pore structure evolution Grouting cycles Reinforcement variable
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Micro-nanoscale pore structure characteristics and enrichment mechanisms of shale oil in mixed sedimentary reservoirs of the Jimusar Sag,Junggar Basin,northwestern China 认领 引用
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作者 Lei Xiao Yi-Wen Ju +8 位作者 Jun Jin Jin Liu Jing-Qiang Tan Shu Jiang Xin Li Bing Hou Peng Qiao Xin-Gao Hou Jian Gao 《Petroleum Science》 SCIE EI CAS CSCD 2026年第3期1089-1104,共16页
The successful development of shale oil in the United States has completely changed the global energy landscape.In recent years,shale oil in the Junggar Basin in China has attracted widespread attention.The Permian Lu... The successful development of shale oil in the United States has completely changed the global energy landscape.In recent years,shale oil in the Junggar Basin in China has attracted widespread attention.The Permian Lucaogou Formation in the Junggar Basin features a mixed sedimentary reservoir with a complex pore structure,which hinders the understanding of the micro-and nano-scale enrichment process of shale oil.In this paper,high-pressure mercury injection(HPMI),low-temperature nitrogen adsorption(LTNA),and laser scanning confocal microscopy(LSCM)are conducted to quantitatively characterize the pore structure of the reservoir.The results show that the pore size distribution is bimodal,with the main peak appearing near 1.89–3.15 nm and the secondary peak appearing near 30.75–84.58 nm.The specific surface area(SSA)ranges from 3.155 m2/g to 20.681 m2/g,and the mesopores are the main contributor.The pore space is characterized by multiple fractals,with DMranging from 2.0366 to 2.9872 derived from high-pressure mercury injection.The DN1and DN2obtained from low-temperature nitrogen adsorption are 2.1662–2.6254 and 2.0768–2.7283.Oil content is strongly influenced by reservoir porosity.The fractal characteristics of pores(2.32–36.90 nm)have a more obvious effect on oil content.The maturity stage of organic matter determines the generation of light and heavy components in shale oil,while the coupling of charging force and pore capillary resistance controls the enrichment pattern of light components in the pore center and heavy components in the pore edge.The results are helpful for the optimization of favorable shale oil blocks and provide theoretical guidance for the exploration of oil and gas resources and the development of oil recovery technology. 展开更多
关键词 Jimusar Sag Shale oil Occurrence state Pore structure Fractal dimension
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Influence mechanism of pore structure evolution on oxygen consumption dynamics during low-temperature oxidation of igneous metamorphic coal 认领 引用
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作者 Xu Shao Botao Qin +5 位作者 Quanlin Shi Ziwei Li Bao Qu Shibo Xu Junyu Wang Mingyue Weng 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第3期553-572,共20页
In igneous-intruded coal seams,coal undergoes significant metamorphism,which critically alters its pore structure and oxygen consumption dynamics,thereby elevating its spontaneous combustion tendency.This study invest... In igneous-intruded coal seams,coal undergoes significant metamorphism,which critically alters its pore structure and oxygen consumption dynamics,thereby elevating its spontaneous combustion tendency.This study investigates the specific surface area,pore volume,structure complexity/connectivity,heterogeneity/local features of pore size distribution,and oxygen consumption dynamics of igneous metamorphic coal through N2/CO2 isothermal adsorption tests and low-temperature oxidation experiments,and elucidates the influence mechanisms of pore structure evolution on oxygen consumption dynamics during low-temperature oxidation.With increasing metamorphic degree,igneous metamorphic coal exhibits a more pronounced reduction in specific surface area during oxidation,while the increase in structure complexity due to coal-oxygen reactions is suppressed.Thermally metamorphic coal demonstrates accelerated oxygen consumption,with oxidation amplifying the difference in reaction rates compared to raw coal.Key mechanisms include oxidation-induced reduction in mesopore complexity and micropore volume,decreased dominance of small-pore-volume apertures,and increased heterogeneity,collectively leading to a lower half-oxygen-consuming temperature and steeper oxygen consumption curves.Simultaneously,increased pore volume/complexity and reduced uniformity/connectivity act synergistically to enhance oxygen consumption capacity,highlighting the coupling between pore structure evolution and oxidation behavior in igneous metamorphic coal.This study provides theoretical insights into the pore-oxygen coupling mechanisms governing coal spontaneous combustion in igneous intrusion areas. 展开更多
关键词 Igneous metamorphic coal Thermal metamorphism Low-temperature oxidation Pore structure Oxygen consumption dynamics
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Pore structure-controlled CO2 huff-n-puff efficiency in Jimusar shale oil reservoirs:Insights from classified oil reservoirs 认领 引用
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作者 Qing Li Ying-Yan Li +5 位作者 Pei-Yu Li Ji-Xiang He Yi-Lei Song Chi-Yang Yu Zhao-Jie Song Hao-Chen Ren 《Petroleum Science》 SCIE EI CAS CSCD 2026年第4期2030-2045,共16页
CO2 huff-n-puff is a promising enhanced oil recovery technique for shale oil reservoirs,but its efficiency in relation to pore structure across classified oil reservoirs remains unclear.This study investigates thre... CO2 huff-n-puff is a promising enhanced oil recovery technique for shale oil reservoirs,but its efficiency in relation to pore structure across classified oil reservoirs remains unclear.This study investigates three reservoir classes(TypesⅠ–Ⅲ)in the Jimusar Sag using high pressure mercury intrusion,nitrogen adsorption,and NMR to characterize pore architectures.Results show that the shale cores from the Jimusar shale oil reservoir are overall dominated by medium pores,with generally small pore radii.Among them,the TypeⅠoil reservoir class has a higher proportion of large pores(>300 nm),whereas the TypeⅢoil reservoir class has a higher proportion of small pores(24 MPa)reveal significant cumulative oil recovery differences:56.36%(TypeⅠ),46.81%(TypeⅡ),and 28.30%(TypeⅢ)after four cycles.Recovery correlates with pore size:The TypeⅠoil reservoir class,with a higher proportion of large pores,exhibits stronger CO2 flow capacity,whereas the TypeⅢoil reservoir class,with a larger proportion of small pores,significantly restricts oil mobilization.A second derivative analysis of the recovery–pore radius curve quantifies mobilization thresholds,indicating a lower limit effective pore radius of 20–35 nm.Sensitivity analysis shows that increasing injection pressure more effectively improves recovery and lowers the mobilization threshold than extending soaking time. 展开更多
关键词 Shale oil reservoirs Pore structures CO2huff-n-puff Nuclear magnetic resonance Productive pore threshold
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Phosphorus leaching in alkaline soils:the role of soil texture and pore structure 认领 引用
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作者 WANG Jie YANG Bangge +3 位作者 WEI Yujie ZHENG Hao XIONG Yi CAI Chongfa 《Journal of Mountain Science》 SCIE CSCD 2026年第2期583-596,共14页
Phosphorus(P)leaching in alkaline soils,exacerbated by excessive fertilizer application,represents a significant pathway for P loss.While soil pore structure and texture critically regulate P transport,mechanisms gove... Phosphorus(P)leaching in alkaline soils,exacerbated by excessive fertilizer application,represents a significant pathway for P loss.While soil pore structure and texture critically regulate P transport,mechanisms governing P loss in texturally diverse alkaline soils remain unclear.This study investigated P leaching dynamics and transport parameters across four alkaline soil textures(silty clay,clay loam,loam,sandy loam)using a one-dimensional convective-diffusion equation(CDE)based on column experiments.Results indicated that phosphorus leaching kinetics were predominantly governed by diffusion transport,evidenced by low Peclet numbers(Pe)(ranged from 0.02 to 0.31)across varying textures and initial P concentrations(C0).Comparative analysis of transport parameters revealed significant textural effects on dispersion coefficient(D),retardation factor(R),pore water velocity(V),Pe,and diffusion coefficient(λ)(F>523.42,p89.47,p<0.001).Saturated hydraulic conductivity(Ks)(R2=62.9%,p<0.01)and total pore area(A)(R2=12.4%,p<0.01)emerged as primary regulators of P leaching.Enhanced clay content increased total pore area while reducing average pore diameter,concurrently decreasing pore water velocity and saturated infiltration rates.These textural modifications amplified diffusive P transport within soil matrices.The findings provide mechanistic insights into texturedependent P mobility in alkaline environments,informing targeted strategies for agricultural phosphorus management. 展开更多
关键词 Soil phosphorus leaching Alkaline soil Soil texture Soil pore structure Convective dispersive equation
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Damage and pore structure characteristics of sandstone subjected to the disturbance creep process 认领 引用
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作者 Jie Chen Ziyang Chen +6 位作者 Xiaokang Pan Yi Cui Bin Yu Jinlai Zhao Xuhui Hu Jiangsong Jiang Yuanbin Luo 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第2期1413-1428,共16页
This study investigated the effects of periodic high-frequency stress disturbances on the creep behavior of sandstone and analyzed the microstructural changes using nuclear magnetic resonance(NMR)technology.High-frequ... This study investigated the effects of periodic high-frequency stress disturbances on the creep behavior of sandstone and analyzed the microstructural changes using nuclear magnetic resonance(NMR)technology.High-frequency disturbance creep experiments were conducted on sandstone under different disturbance frequencies,disturbance cycles and loading stresses,and the following findings were obtained.Firstly,with the increase of loading stress and disturbance cycles,the total porosity increments,and damage value of sandstone increase,while the fractal dimension of sandstone pore structure presents the opposite trend.Secondly,during the disturbance creep process,the volumes of all three types of pores increase,but the proportion of micropores(T2100 ms)increases.Thirdly,the fractal dimension difference has a good linear relationship with the damage,strain and porosity increment of sandstone during the disturbance creep process.Finally,the higher the disturbance frequency,the smaller the creep strain and creep strain rate during the steady-state creep stage.The study offers valuable theoretical insights for understanding rock creep behavior in complex stress environments. 展开更多
关键词 Damage Pore structure Creep High-frequency stress disturbance Nuclear magnetic resonance(NMR)
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Deterioration and Pore Structure Evolution of GO Modified Polymer Cement Mortar under Salt-freeze-thaw Coupling Effects 认领 引用
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作者 ZHAO Xinyuan WEI Zhiqiang +3 位作者 QIAO Hongxia LI Shaofei CAO Hui XI Lingling 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第1期234-246,共13页
To investigate the pore structure of graphene oxide modified polymer cement mortar(GOPM)under salt-freeze-thaw(SFT)coupling effects and its impact on deterioration,this study modifies polymer cement mortar(EMCM)with g... To investigate the pore structure of graphene oxide modified polymer cement mortar(GOPM)under salt-freeze-thaw(SFT)coupling effects and its impact on deterioration,this study modifies polymer cement mortar(EMCM)with graphene oxide(GO).The micro-pore structure of GOPM is characterized using LF-NMR and SEM.Fractal theory is applied to calculate the fractal dimension of pore volume,and the deterioration patterns are analyzed based on the evolution characteristics of capillary pores.The experimental results indicate that,after 25 salt-freeze-thaw cycles(SFTc),SO2-4 ions penetrate the matrix,generating corrosion products that fill existing pores and enhance the compactness of the specimen.As the number of cycles increases,the ongoing formation and expansion of corrosion products within the matrix,combined with persistent freezing forces,and result in the degradation of the pore structure.Therefore,the mass loss rate(MLR)of the specimens shows a trend of first decreasing and then increasing,while the relative dynamic elastic modulus(RDEM)initially increases and then decreases.Compared to the PC group specimens,the G3PM group specimens show a 28.71% reduction in MLR and a 31.42% increase in RDEM after 150 SFTc.The fractal dimensions of the transition pores,capillary pores,and macropores in the G3PM specimens first increase and then decrease as the number of SFTc increases.Among them,the capillary pores show the highest correlation with MLR and RDEM,with correlation coefficients of 0.97438 and 0.98555,respectively. 展开更多
关键词 graphene oxide polymer cement mortar pore structure fractal dimension
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Control of ash yield on vertical pore structure development and its impact on coalbed methane adsorption in the deep coal seams of the Ordos Basin 认领 引用
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作者 Runye Han Hua Wang +5 位作者 Yan Liu Cheng Li Xiangchun Chang Lingyu Zhao Shangbin Wang Junjian Zhang 《Natural Gas Industry B》 2026年第1期9-29,共21页
The vertical heterogeneity of the pore structure in deep coal seams with varying ash yields is a key control for coalbed methane storage and producibility;however,its specific impact on gas adsorption is not clearly d... The vertical heterogeneity of the pore structure in deep coal seams with varying ash yields is a key control for coalbed methane storage and producibility;however,its specific impact on gas adsorption is not clearly defined.The focus of this study is the No.8 coal seam of the Carboniferous Benxi Formation in the Central-Eastern Ordos Basin.By integrating microscopic identification,proximate analysis,gas adsorption(CO2,N2,and CH4),and the multifractal theory,we quantitatively characterized the nanopore structure(micropores<2 nm and mesopores 2 nm-100 nm)of coal reservoirs with varying ash yields.The results indicate that(1)ash yield is the primary factor that controls the vertical evolution of pore structures in coal seams.In low-ash yield coal seams,the extent of thermal evolution and ash yield jointly constrain the heterogeneity of pore size distribution.In mediumto high-ash yield coal seams,the heterogeneity of pore structure and pore size distribution are predominantly constrained by ash yield.(2)As the ash yield vertically increases,the mesoporous pore volume and specific surface area initially decrease and subsequently increase,while the contribution of micropores to both pore volume and specific surface area continuously diminishes.Consequently,the total pore volume and specific surface area of the coal samples exhibit a two-stage reduction close to an ash yield threshold of approximately 20%.(3)Further,the Langmuir volume for CH4adsorption sharply declines below the 20%threshold,followed by a gradual decrease;in contrast,the Langmuir pressure initially decreases and subsequently increases.Hence,the vertical increase in ash yield constrains the development of pore systems and diminishes pore connectivity,thereby reducing methane adsorption capacity and adversely affecting coalbed methane productivity.(4)Low-ash yield coal reservoirs are characterized by a rapid gas breakthrough and high productivity,whereas medium-ash yield coal reservoirs generally require prolonged depressurization to achieve peak gas production.These findings reveal that in medium-high rank coal,ash yield―and not thermal evolution―is the main factor that controls vertical pore evolution and methane adsorption efficiency.The quantitative ash yield threshold(20%)established in this study provides a practical criterion for evaluating reservoir quality and predicting vertical variations in gas storage potential in the Ordos Basin. 展开更多
关键词 Ash yields Pore structure Multifractal Vertical heterogeneity Deep coal seam Ordos Basin
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Deterioration characteristics and pore structure evolution of red sandstone with different saturation levels under freeze-thaw cycles 认领 引用
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作者 WANG Liping PAN Xuanchen +1 位作者 WANG Jing HAO Zhexiao 《Journal of Mountain Science》 SCIE CSCD 2026年第7期3394-3406,共13页
Red sandstone,characterized by welldeveloped porosity and strong water absorption capacity,provides a representative medium for investigating freeze-thaw deterioration in porous rocks.Although freeze-thaw damage has b... Red sandstone,characterized by welldeveloped porosity and strong water absorption capacity,provides a representative medium for investigating freeze-thaw deterioration in porous rocks.Although freeze-thaw damage has been widely studied,the role of saturation level in linking macroscopic degradation with pore-scale structural evolution remains insufficiently understood.In this study,red sandstone specimens with three initial saturation levels(0%,50%,and 100%)were subjected to up to 50freeze-thaw cycles.Macroscopic deterioration was evaluated using surface observations and P-wave velocity measurements,while pore-scale evolution of fully saturated specimens was characterized by highresolution X-ray computed tomography,threedimensional reconstruction,pore-throat analysis,and lattice Boltzmann permeability simulation.The results show that increasing saturation generally intensified freeze-thaw deterioration.Fully saturated specimens exhibited the most evident surface damage,pore expansion,internal cracking,and permeability enhancement,whereas dry and partially saturated specimens showed relatively limited degradation.CT analysis showed that the porosity of fully saturated sandstone increased from 18.68% to 23.01% after 50cycles,while the average fractal dimension increased from 2.44 to 2.53.The pore-throat system evolved from fine,weakly connected structures to coarser,more connected,and morphologically complex networks.Permeability increased most markedly in the interior region,with the maximum value rising from 9.57 Darcy to 25.60 Darcy,indicating that freeze-thaw cycling promoted internal pore coalescence and the formation of effective seepage pathways.The deterioration mechanism is interpreted as the coupled action of thermoelastic mismatch cracking and ice-induced cracking:the former contributes to microcrack initiation under repeated temperature fluctuations,whereas the latter promotes pore enlargement and crack propagation under high saturation.These findings clarify how water content controls freeze-thaw damage through both ice-induced pressure and porenetwork reorganization,providing pore-scale evidence for durability assessment of porous rocks in cold-region engineering and stone heritage conservation. 展开更多
关键词 Freeze-thaw cycles Red sandstone Saturation Pore structure X-ray computed tomography Permeability
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Impacts of Himalayan tectonism on Eocene gas shale and its pore structure within the Lesser Himalayas,Nepal:Insights for shale gas accumulation and preservation 认领 引用
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作者 Kumar Khadka Si-Jie Han +6 位作者 Shu-Xun Sang Jun-Jie He Upendra Baral Saunak Bhandari Debashish Mondal Xiao-Zhi Zhou Shi-Qi Liu 《Petroleum Science》 SCIE EI CAS CSCD 2026年第1期103-126,共24页
This study investigates the complex relationship between organic matter(OM),tectonic deformation,and pore structure development in Eocene Bhainskati shale within the Lesser Himalayan foreland basin,Nepal,to assess its... This study investigates the complex relationship between organic matter(OM),tectonic deformation,and pore structure development in Eocene Bhainskati shale within the Lesser Himalayan foreland basin,Nepal,to assess its implications for shale gas accumulation and preservation.We hypothesize that tectonic deformation and variations in organic matter have a significant impact on pore size distribution,connectivity,and gas retention,thereby influencing shale gas potential.We characterized pore types and quantified pore size distributions using scanning electron microscopy(SEM),mercury intrusion capillary pressure(MICP)techniques,and low-pressure gas adsorption methods.Our findings indicate a predominance of mesopores(1-10 nm range,with a notable peak at 4 nm),suggesting substantial contributions to surface area from micropores and fine mesopores.Thermal maturity negatively impacts porosity and surface area.At the same time,tectonic activity enhances microfracture development,increasing permeability and gas transport,particularly in the Surkhet area,which exhibits higher pore volume and specific surface area than the Tansen area.Tectonic forces shift the shale from brittle to ductile behavior,altering pore connectivity.Himalayan tectonic forces significantly influence shale structure,pore sizes,gas preservation,and migration,enhancing gas adsorption by increasing surface area but posing challenges due to potential gas escape along faults and folds.Understanding the impact of tectonic activity on shale deformation in similar basins within the Himalayas and the adjacent region is vital for assessing shale gas potential and optimizing exploration strategies in tectonically active Nepal Himalayan regions.This study highlights the dual role of tectonics in both promoting and complicating the formation,accumulation,and preservation of shale gas reservoirs,offering critical insights for future exploration efforts. 展开更多
关键词 Gas shale Eocene foreland basin Pore structure Tectonic deformation Himalayan tectonics Gas preservation
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Modulating the open pore structure of hard carbons derived from wood for sodium-ion battery anodes 认领 引用
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作者 Li Menglong Gong Jun +2 位作者 Li Jinming Xie Haipeng Li Yejun 《新型炭材料（中英文）》 SCIE EI CSCD 北大核心 2026年第3期652-663,I0063-I0071,共12页
Hard carbon(HC)derived from renewable biomass is a promising anode material for sodium-ion batteries(SIBs).However,controlling the structure of hard carbon so that it has a high energy density,favorable rate performan... Hard carbon(HC)derived from renewable biomass is a promising anode material for sodium-ion batteries(SIBs).However,controlling the structure of hard carbon so that it has a high energy density,favorable rate performance,and cycling stability is still a challenge.We propose a strategy to control the open pore structure of hard carbon derived from wood for sodiumion storage by the addition of sodium carbonate under carbonization at 1100℃.The resulting HC has an increased interlayer spacing,and a more uniform open pore distribution(2-3 nm)with a high slope capacity,thereby enabling efficient sodium-ion transport and storage.The HC anode has a reversible capacity of 326 mAh g−1 at a current density of 30 mA g−1,and maintains a reversible capacity of 270 mAh g−1 at 1 A g−1 and a capacity of 68 mAh g−1 even at 10 A g−1 during rate performance tests.After 300 cycles,it retains 76.7%(207 mAh g−1)of its capacity at 1.0 A g−1.In situ Raman spectroscopy and the galvanostatic intermittent titration testing results reveal an adsorption-intercalation-filling sodium storage mechanism.This work provides a strategy to optimize the open pore structure of biomass derived hard carbon for high performance sodium ion storage. 展开更多
关键词 Sodium-ion batteries Hard carbon Biomass Pore structure
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Influence of pore structure on the dynamic response of porous rocks under high strain-rate impact:A mesoscale numerical investigation 认领 引用
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作者 Zi-Zhen Wang Wen-Sheng Zhang +2 位作者 Yan-Bin Zang Xiao-Ao Liu Wei-Dong Zhou 《Petroleum Science》 SCIE EI CAS CSCD 2026年第6期3334-3350,共17页
This study establishes a numerical simulation method for modeling the dynamic response of porous rocks under high strain-rate impacts and verifies its robustness,accuracy,and reproducibility.A systematic investigation... This study establishes a numerical simulation method for modeling the dynamic response of porous rocks under high strain-rate impacts and verifies its robustness,accuracy,and reproducibility.A systematic investigation was conducted to evaluate the effects of four pore structure parameters—po rosity,pore size,aspect ratio,and orientation angle—on the dynamic response of rocks.The results indicate that increasing porosity significantly reduces normalized strength(σnorm),dynamic Young's modulus(Ed),and energy dissipation density(Uv),with the degree of weakening influenced by pore geometry.A greater aspect ratio difference leads to higher Uv,suggesting that more flattened pores promote complex fracture development and energy dissipation.Furthermore,the study reveals a coupled mechanism between pore structure and impact loading characteristics:Porosity exerts the most significant control on the rock's impact response under different stress-wave loading conditions,whereas the effects of pore shape and size are comparatively secondary.For strength weakening,non-optimal loading periods(T=200 or 800μs)are recommended to avoid the strengthening effect observed at T=400μs to improve energy efficiency,the optimal loading period should be selected based on porosity.When porosity is less than 3%,applying an impact stress wave with an amplitude 12 times the rock matrix strength achieves an optimal balance between strength reduction and energy efficiency;when porosity exceeds 5%,an amplitude of 6 times the matrix strength yields superior energy utilization.The findings propose a porosity-driven impact loading design strategy,providing theoretical and quantitative guidance for field-scale engineering applications. 展开更多
关键词 Pore structure Dynamic mechanics Split hopkinson pressure bar(SHPB) Numerical investigation
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Superior Abrasibility of YSZ(ESP)/BN@ZrO2-Polyester Composite Sealing Coating Reinforcing With Hybrid Micron/Nanometer Multiscaled Pore Structure 认领 引用
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作者 Shuang Yu Shuqi Wang +6 位作者 Yaming Wang Jiao Han Zhiyun Ye Kai Lv Yongchun Zou Guoliang Chen Jiahu Ouyang 《Rare Metals》 SCIE EI CAS CSCD 2026年第5期335-351,共17页
Composite materials hold significant potential for abrasive sealing,yet composite materials used for abrasive sealing fall short in service durability under extreme environments.Here,a controllable strategy for adjust... Composite materials hold significant potential for abrasive sealing,yet composite materials used for abrasive sealing fall short in service durability under extreme environments.Here,a controllable strategy for adjusting pore structure is proposed,aiming to design a YSZ(ESP)/BN@ZrO2-polyester coating with hybrid micronanometer multiscaled pores to improve the mechanical stability and abradability.By adding porous feedstocks prepared by electrostatic spraying associated with phase inversion(ESP)in conjunction with the control strategy of pore-forming agents,the porosity of the composite coating is achieved at 27.5%,including 45.9%interlayer micropores to enhance abradability,and 54.1%intralayer nanopores to disperse and transfer stress.The BN@ZrO2lubricant with core-shell structure in YSZ(ESP)/BN@ZrO2-polyester effectively increases the operating temperature of BN,ensures its effective release,and forms a smooth"glaze"layer at 1000℃,thereby reducing the coefficient of friction to 0.2.The hybrid micronanometer multiscale pores in the coating increase the intrusion depth ratio to-67%,and the uniformly distributed nanopores avoid delamination caused by weak interlayer adhesion,effectively improving hightemperature abradability and service durability.The findings underscore the substantial potential of the proposed YSZ(ESP)/BN@ZrO2-polyester coating,facilitating applications across diverse domains such as hypersonic aircraft,naval vessels,and ground power generation gas turbine engines. 展开更多
关键词 abradable sealing coatings(ASCs) abrasibility electrostatic spraying associated with phase inversion(ESP) multiscale pores structure
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Impact of dissolution and precipitation on pore structure in CO2sequestration within tight sandstone reservoirs 认领 引用 被引量：2
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作者 Hui Gao Kai-Qing Luo +6 位作者 Chen Wang Teng Li Zhi-Lin Cheng Liang-Bin Dou Kai Zhao Nan Zhang Yue-Liang Liu 《Petroleum Science》 SCIE EI CAS CSCD 2025年第2期868-883,共16页
Complex physical and chemical reactions during CO2sequestration alter the microscopic pore structure of geological formations,impacting sequestration stability.To investigate CO2sequestration dynamics,comprehens... Complex physical and chemical reactions during CO2sequestration alter the microscopic pore structure of geological formations,impacting sequestration stability.To investigate CO2sequestration dynamics,comprehensive physical simulation experiments were conducted under varied pressures,coupled with assessments of changes in mineral composition,ion concentrations,pore morphology,permeability,and sequestration capacity before and after experimentation.Simultaneously,a method using NMR T2spectra changes to measure pore volume shift and estimate CO2sequestration is introduced.It quantifies CO2needed for mineralization of soluble minerals.However,when CO2dissolves in crude oil,the precipitation of asphaltene compounds impairs both seepage and storage capacities.Notably,the impact of dissolution and precipitation is closely associated with storage pressure,with a particularly pronounced influence on smaller pores.As pressure levels rise,the magnitude of pore alterations progressively increases.At a pressure threshold of 25 MPa,the rate of change in small pores due to dissolution reaches a maximum of 39.14%,while precipitation results in a change rate of-58.05%for small pores.The observed formation of dissolution pores and micro-cracks during dissolution,coupled with asphaltene precipitation,provides crucial insights for establishing CO2sequestration parameters and optimizing strategies in low permeability reservoirs. 展开更多
关键词 Dissolution Precipitation Pore structure CO2sequestration Unconventional reservoirs
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Insights into the pore structure and hydrocarbon accumulation of lacustrine organic-rich shales 认领 引用 被引量：2
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作者 Xiao-Jiao Pang Gui-Wen Wang +4 位作者 Yong-Jia Zhang Da-Li Yue Hong-Bin Li Li-Chun Kuang Chao-Liu Li 《Petroleum Science》 SCIE EI CAS CSCD 2025年第3期957-976,共20页
With the development of unconventional hydrocarbon, how to improve the shale oil and gas recovery become urgent. Therefore hydraulic fracturing becomes the key due to the complicated properties of the reservoirs. The ... With the development of unconventional hydrocarbon, how to improve the shale oil and gas recovery become urgent. Therefore hydraulic fracturing becomes the key due to the complicated properties of the reservoirs. The pore structure not only plays an essential role in the formation of complex fracture networks after fracturing but also in resource accumulation mechanism analyses. The lacustrine organicrich shale samples were selected to carry out petrophysical experiments. Scanning Electron Microscopy(SEM) and X-ray Diffraction were performed to elucidate the geology characteristics. MICP, 2D NMR, CT,and N2adsorption were conducted to classify the pore structure types. The contribution of pore structure to oil accumulation and hydrocarbon enrichment was explained through the N2adsorption test on the original and extracted state and 2D NMR. The results show that micropores with diameter less than20 nm are well-developed. The pore structure was divided into three types. Type Ⅰ is characterized by high porosity, lower surface area, and good pore throat connectivity, with free oil existing in large pores,especially lamellation fractures. The dominant nano-pores are spongy organic pores and resources hosted in large pores have been expelled during high thermal evolution. The content of nano-pores(micropores) increases and the pore volume decreases in Type Ⅱ pore structure. In addition, more absorbed oil was enriched. The pore size distribution of type Ⅱ is similar to that of type Ⅰ. However, the maturity and hydrocarbon accumulation is quite different. The oil reserved in large pores was not expelled attributed to the relatively low thermal evolution compared with type Ⅰ. Structural vitrinite was observed through SEM indicating kerogen of type Ⅲ developed in this kind of reservoir while the type of kerogen in pore structure Ⅰ is type Ⅱ. Type Ⅲ pore structure is characterized by the largest surface area,lowest porosity, and almost isolated pores with rarely free oil. Type Ⅰ makes the most contribution to hydrocarbon accumulation and immigration, which shows the best prospect. Of all of these experiments,N2adsorption exhibits the best in characterizing pores in shales due to its high resolution for the assessment of nano-scale pores. MICP and NMR have a better advantage in characterizing pore space of sandstone reservoirs, even tight sandstone reservoirs. 2D NMR plays an essential role in fluid recognition and saturation calculation. CT scanning provides a 3D visualization of reservoir space and directly shows the relationship between pores and throats and the characteristics of fractures. This study hopes to guide experiment selection in pore structure characterization in different reservoirs. This research provides insight into hydrocarbon accumulation of shales and guidance in the exploration and development of unconventional resources, for example for geothermal and CCUS reservoirs. 展开更多
关键词 Shale oil Pore structure Nitrogen adsorption 2D NMR Hydrocarbon accumulation
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Pore structure variation characteristics of a Chinese local mudstone before and after the first cycle of wetting and drying 认领 引用 被引量：1
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作者 ZHANG Qing-song LIU Zhi-bin +3 位作者 TANG Ya-sen DENG Yong-feng LUO Ting-yi MENG Fan-xing 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第2期582-596,共15页
As a typical sedimentary soft rock,mudstone has the characteristics of being easily softened and disintegrated under the effect of wetting and drying(WD).The first cycle of WD plays an important role in the entire WD ... As a typical sedimentary soft rock,mudstone has the characteristics of being easily softened and disintegrated under the effect of wetting and drying(WD).The first cycle of WD plays an important role in the entire WD cycles.X-ray micro-computed tomography(micro-CT)was used as a non-destructive tool to quantitatively analyze microstructural changes of the mudstone due to the first cycle of WD.The test results show that WD leads to an increase of pore volume and pore connectivity in the mudstone.The porosity and fractal dimension of each slice of mudstone not only increase in value,but also in fluctuation amplitude.The pattern of variation in the frequency distribution of the equivalent radii of connected,isolated pores and pore throats in mudstone under WD effect satisfies the Gaussian distribution.Under the effect of WD,pores and pore throats with relatively small sizes increase the most.The sphericity of the pores in mudstones is positively correlated with the pore radius.The WD effect transforms the originally angular and flat pores into round and regular pores.This paper can provide a reference for the study of the deterioration and catastrophic mechanisms of mudstone under wetting and drying cycles. 展开更多
关键词 mudstone wetting and drying cycle X-ray micro-computed tomography pore structure pore morphology
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Enhanced permeability mechanism in coal seams through liquid nitrogen immersion:multi-scale pore structure analysis 认领 引用 被引量：1
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作者 LI Xue-long CHEN De-you +5 位作者 LIU Shu-min WANG Deng-ke SUN Hai-tao YIN Da-wei ZHANG Yong-gang GONG Bin 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第7期2732-2749,共18页
The geological structure of coal seams in China is remarkably varied and complex,with coalbed methane reservoirs marked by significant heterogeneity and low permeability,creating substantial technical challenges for e... The geological structure of coal seams in China is remarkably varied and complex,with coalbed methane reservoirs marked by significant heterogeneity and low permeability,creating substantial technical challenges for efficient extraction.This study systematically investigates the impact of liquid nitrogen immersion(LNI)on the coal’s pore structure and its mechanism of enhancing permeability with a combination of quantitative nuclear magnetic resonance(NMR)analysis,nitrogen adsorption experiments,and fractal dimension calculations.The results demonstrate that LNI can damage the coal’s pore structure and promote fracture expansion through thermal stress induction and moisture phase transformation,thereby enhancing the permeability of coal seams.The T2peak area in the NMR experiments on coal samples subjected to LNI treatment shows a significant increase,the Brunauer-Emmett-Teller(BET)specific surface area decreases to 6.02 m2/g,and the Barrett-Joyner-Halenda(BJH)total pore volume increases to 14.99 mm3/g.Furthermore,changes in fractal dimensions(D1rising from 2.804 to 2.837,and D2falling from 2.757 to 2.594)indicate a notable enhancement in the complexity of the pore structure.With increasing LNI cycles,the adsorption capacity of the coal samples diminishes,suggesting a significant optimization of the pore structure.This optimization is particularly evident in the reconstruction of the micropore structure,which in turn greatly enhances the complexity and connectivity of the sample’s pore network.In summary,the study concludes that LNI technology can effectively improve the permeability of coal seams and the extraction efficiency of coalbed methane by optimizing the micropore structure and enhancing pore connectivity,which offers a potential method for enhancing the permeability of gas-bearing coal seams and facilitating the development and utilization of coalbed methane. 展开更多
关键词 liquid nitrogen immersion(LNI) coal seam pore structure permeability nuclear magnetic resonance(NMR) fractal dimension
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Organic Matter Occurrence and Its Effects on Pore Structure and Methane Adsorption Capacity:A Case Study of the Niutitang Black Shale in Guizhou,China 认领 引用 被引量：1
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作者 Peng Xia Fang Hao +5 位作者 Jinqiang Tian Yong Fu Yuliang Mou Chuan Guo Zhen Yang Ke Wang 《Journal of Earth Science》 SCIE CAS CSCD 2025年第2期597-610,共14页
The black shale samples from the Niutitang Formation in the Yangtze Block were sequentially treated using organic solvent extraction and wet chemical oxidation.The organic matter(OM)in the shales includes physically m... The black shale samples from the Niutitang Formation in the Yangtze Block were sequentially treated using organic solvent extraction and wet chemical oxidation.The organic matter(OM)in the shales includes physically mobile OM(PmOM),chemically mobile OM(CmOM),and stable OM(StOM).The CmOM has the strongest CH4adsorption capacity because it has the largest volume of micropores and mesopores.In contrast,the PmOM has a very negative effect on the CH4adsorption because it is poreless.The XD shale is a siliceous shale,in which the quartz particles wrap partly OM,preventing extraction and oxidation.The SL shale is an argillaceous shale,in which most of the OM is combined with clay minerals to form organo-clay composites.In both the SL and XD shales,the OM that is extractable via organic solvents is distributed among the mineral particles and is interconnected.The conceptual model of marine black shale in different environments needs to be perfected in the future because quantitative and qualitative methods should be combined to clarify the relationship between the known OM types(e.g.,pyrobitumen,solid bitumen,and solid kerogen)and the OM types identified in this study. 展开更多
关键词 organic matter pore structure black shales shale gas Early Cambrian petroleum geology
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Pore structure properties characterization of shale using generative adversarial network:Image augmentation,super-resolution reconstruction,and multi-mineral auto-segmentation 认领 引用 被引量：1
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作者 LIU Fugui YANG Yongfei +7 位作者 YANG Haiyuan TAO Liu TAO Yunwei ZHANG Kai SUN Hai ZHANG Lei ZHONG Junjie YAO Jun 《Petroleum Exploration and Development》 SCIE 2025年第5期1262-1274,共13页
Existing imaging techniques cannot simultaneously achieve high resolution and a wide field of view,and manual multi-mineral segmentation in shale lacks precision.To address these limitations,we propose a comprehensive... Existing imaging techniques cannot simultaneously achieve high resolution and a wide field of view,and manual multi-mineral segmentation in shale lacks precision.To address these limitations,we propose a comprehensive framework based on generative adversarial network(GAN)for characterizing pore structure properties of shale,which incorporates image augmentation,super-resolution reconstruction,and multi-mineral auto-segmentation.Using real 2D and 3D shale images,the framework was assessed through correlation function,entropy,porosity,pore size distribution,and permeability.The application results show that this framework enables the enhancement of 3D low-resolution digital cores by a scale factor of 8,without paired shale images,effectively reconstructing the unresolved fine-scale pores under a low resolution,rather than merely denoising,deblurring,and edge clarification.The trained GAN-based segmentation model effectively improves manual multi-mineral segmentation results,resulting in a strong resemblance to real samples in terms of pore size distribution and permeability.This framework significantly improves the characterization of complex shale microstructures and can be expanded to other heterogeneous porous media,such as carbonate,coal,and tight sandstone reservoirs. 展开更多
关键词 shale pore structure parameter generative adversarial network super-resolution multi-mineral auto-segmentation multiscale fusion
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