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Shale pore modification induced by syncline bending in the Eastern Fold Belt of Sichuan Basin,South China 认领 引用
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作者 Yi-Ting Qiao Rui Liu +7 位作者 Shang Xu Jun-Wei Pu Fang Hao Tong-Tong Luo Ke-Xuan Li Xiu-Cheng Tan Wei-Ming Chen Yu-Feng Tang 《Petroleum Science》 SCIE EI CAS CSCD 2026年第1期1-16,共16页
Shale deformation is crucial in various geological processes.To investigate the effect of deformation on pore characteristics for highly compacted shale,the macro tectonic strain and micro pore structure were analyzed... Shale deformation is crucial in various geological processes.To investigate the effect of deformation on pore characteristics for highly compacted shale,the macro tectonic strain and micro pore structure were analyzed in the deeply buried Wufeng-Longmaxi shale of the Eastern Fold Belt of the Sichuan Basin.Despite similarities in their X-ray diffraction mineral compositions,significant differences in pore properties were observed between the shale samples from weak and strong curved synclines.Pore shapes identified from scanning electron microscopy and the covariation between total organic carbon(TOC)content and porosity suggest that organic pores predominantly contribute to total porosity.However,samples from weak-curved synclines exhibit porosities~2%higher than samples from strongcurved synclines,even with similar TOC contents.Compared to the weak-curved syncline samples,the strong-curved syncline samples show a transformation in organic pore morphology from spherical to elliptical with an increasing aspect ratio and reduced dominant pore size from 1-1000 nm to 1-100 nm due to pore collapse in the organic matrix.The porosities simulated using a syncline bending ductile strain model align well with the measured porosities,indicating that the porosity changes were induced by heterogeneous ductile strain during detachment folding.Strain heterogeneity also triggered tectonic stress heterogeneity,causing clockwise rotation of the principal stress orientation from weak to strong curved synclines.This study improves our understanding of the variations in pore system with syncline deformation strain,providing a theoretical basis for subsequent shale hydrocarbon exploration and resource assessment in complex tectonic zones. 展开更多
关键词 Syncline bending Pore structure Porosity reduction Detachment fold Organic-rich shale Tectonic stress
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Quantitative characterization of the brittleness of deep shales by integrating mineral content,elastic parameters,in situ stress conditions and logging analysis 认领 引用 被引量：3
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作者 Tongtong Luo Jianguo Wang +3 位作者 Li Chen Chaoya Sun Qian Liu Fenggang Wang 《International Journal of Coal Science & Technology》 EI CAS CSCD 2024年第1期167-179,共13页
Deep shale reservoirs(3500–4500 m)exhibit significantly different stress states than moderately deep shale reservoirs(2000–3500 m).As a result,the brittleness response mechanisms of deep shales are also different.It... Deep shale reservoirs(3500–4500 m)exhibit significantly different stress states than moderately deep shale reservoirs(2000–3500 m).As a result,the brittleness response mechanisms of deep shales are also different.It is urgent to investigate methods to evaluate the brittleness of deep shales to meet the increasingly urgent needs of deep shale gas development.In this paper,the quotient of Young’s modulus divided by Poisson’s ratio based on triaxial compression tests under in situ stress conditions is taken as SSBV(Static Standard Brittleness Value).A new and pragmatic technique is developed to determine the static brittleness index that considers elastic parameters,the mineral content,and the in situ stress conditions(BIEMS).The coefficient of determination between BIEMS and SSBV reaches 0.555 for experimental data and 0.805 for field data.This coefficient is higher than that of other brittleness indices when compared to SSBV.BIEMS can offer detailed insights into shale brittleness under various conditions,including different mineral compositions,depths,and stress states.This technique can provide a solid data-based foundation for the selection of‘sweet spots’for single-well engineering and the comparison of the brittleness of shale gas production layers in different areas. 展开更多
关键词 Deep shale reservoirs Brittleness Pressure effect Evaluation method Longmaxi formation Sichuan Basin
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Pore evolution characteristic of shale in the Longmaxi Formation,Sichuan Basin 认领 引用 被引量：7
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作者 Wenping Liu Jun Liu +3 位作者 Molun Cai Chao Luo Xuewen Shi Jian Zhang 《Petroleum Research》 EI 2017年第4期291-300,共10页
Through the field emission scanning electronic microscope(FESEM)and the nitrogen adsorption test,pore type and structure of shale reservoir in the Longmaxi Formation in the Sichuan Basin were well studied.Result showe... Through the field emission scanning electronic microscope(FESEM)and the nitrogen adsorption test,pore type and structure of shale reservoir in the Longmaxi Formation in the Sichuan Basin were well studied.Result showed that the pore type includes organic pore,intercrystalline pore,dissolution intracrystalline pore and interparticle pore,and the organic pore was one of major pore types;among the organic pore,the micropore had large pore volume and specific surface area,and was the main storage space of shale gas.Through study on effect of total organic carbon(TOC),organic matter maturity(Ro),diagenesis and tectonism on shale porosity,influence of TOC on porosity could be divided into four stages:the rapid increasing stage(TOC from 0 to 2%),the slow decreasing stage(TOC from 2 to 3%),the rapid increasing stage(TOC from 3 to 4%or 6%)and the rapid decreasing stage(TOC>4%or 6%);influence of the maturity on porosity of shale could be divided into three stages:the rapid decreasing stage(Ro from 1.5 to 2.2%),the rapid increasing stage(Ro from 2.2 to 2.7%)and the rapid decreasing stage(Ro>2.7%);during the high thermal evolution stage,the organic diagenesis was stronger than the inorganic diagenesis;the tectonism had a great impact on porosity,and the more intense the tectonism was,the smaller the porosity would be.The evolution of shale porosity of the Longmaxi Formation underwent five stages:the immature rapid compaction stage(Ro2.7%);among which the mature hydrocarbon generation and dissolution stage and the overmature secondary pyrolysis stage were the most favorable shale pore development stages。 展开更多
关键词 Organic pore Inorganic pore TOC Organic matter maturity Shale Longmaxi formation
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