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Effects of shear on development characteristics of organic matter pores in shale: A case study of shale in the Niutitang Formation of the well XAD1
Yu, Yuxi1,2; Wang, Zongxiu1; Zhang, Kaixun1; Feng, Xingqiang1; Cheng, Ming2,3
2022-04-01
Source PublicationJOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
ISSN0920-4105
Volume211Pages:17
AbstractThe development characteristics of organic matter pores (OMPs) in shales is fundamental to the gas-bearing property of the shales. Detachment is one of the most common types of structural deformation in shale formations. To investigate the characteristics of OMPs in shear-deformed shale and the associated effects on the pore structure of shale gas reservoir, two sets of detachment zones and the intercalated non-detachment zone of shale formations in the Niutitang Formation of the Well XAD1 are studied. Based on scanning electron microscope observations and low-pressure gas adsorption tests, the impacts of shear on the shale pore structure are evaluated quantitively and the deformation mechanism for OMPs in shale is established. Results indicate that the dominant pore type of shale in the Niutitang Formation of the Well XAD1 is OMPs. With the mineral rheology, organic matters are enriched in the clay gouge, which are more prone to shear deformation compared with those outside the gouge. Under shear, pores developed within the organic matter experienced directional elongation and compression, decreasing the pore sizes and lowering the volumes of the corresponding pores 30 nm; and the contact surface between organic matter and minerals becomes dislocated and open, increasing the volumes of the corresponding pores 30 nm. The effect of shear on OMPs is dominated by pore reduction. The volume loss ratio of shale micropores in detachment zones is the highest which can reach over 90%. The impact of shear on pore structures of non-detachment zone cannot be neglected within the thickness range of 5-20 m from the detachment surface, and the degree of pore reduction gradually decreases as the distance from the detachment zones increases. It is indicated that the detachment and its adjacent horizons are not favorable for shale gas exploration because of the low porosity and adsorption capacity.
KeywordOrganic matter pore Microscopic deformation Shear Pore structure The niutitang formation
DOI10.1016/j.petrol.2022.110166
Funding OrganizationOpening Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accu-mulation and Exploitation ; Opening Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accu-mulation and Exploitation ; Chinese National Natural Science Foundation ; Chinese National Natural Science Foundation ; China Geological Survey ; China Geological Survey ; Opening Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accu-mulation and Exploitation ; Opening Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accu-mulation and Exploitation ; Chinese National Natural Science Foundation ; Chinese National Natural Science Foundation ; China Geological Survey ; China Geological Survey ; Opening Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accu-mulation and Exploitation ; Opening Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accu-mulation and Exploitation ; Chinese National Natural Science Foundation ; Chinese National Natural Science Foundation ; China Geological Survey ; China Geological Survey ; Opening Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accu-mulation and Exploitation ; Opening Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accu-mulation and Exploitation ; Chinese National Natural Science Foundation ; Chinese National Natural Science Foundation ; China Geological Survey ; China Geological Survey
WOS KeywordOPALINUS CLAY INSIGHTS ; GAS-STORAGE ; THRUST CHARACTERISTICS ; DOMINATED DETACHMENT ; MAIN-FAULT ; DEFORMATION ; EVOLUTION ; POROSITY ; ZONE ; MECHANISMS
Language英语
Funding ProjectOpening Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accu-mulation and Exploitation ; Chinese National Natural Science Foundation[41902136] ; Chinese National Natural Science Foundation[41802178] ; China Geological Survey[DD20190085] ; China Geological Survey[DZLXJK202101]
Funding OrganizationOpening Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accu-mulation and Exploitation ; Opening Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accu-mulation and Exploitation ; Chinese National Natural Science Foundation ; Chinese National Natural Science Foundation ; China Geological Survey ; China Geological Survey ; Opening Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accu-mulation and Exploitation ; Opening Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accu-mulation and Exploitation ; Chinese National Natural Science Foundation ; Chinese National Natural Science Foundation ; China Geological Survey ; China Geological Survey ; Opening Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accu-mulation and Exploitation ; Opening Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accu-mulation and Exploitation ; Chinese National Natural Science Foundation ; Chinese National Natural Science Foundation ; China Geological Survey ; China Geological Survey ; Opening Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accu-mulation and Exploitation ; Opening Foundation of Shaanxi Key Laboratory of Lacustrine Shale Gas Accu-mulation and Exploitation ; Chinese National Natural Science Foundation ; Chinese National Natural Science Foundation ; China Geological Survey ; China Geological Survey
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Petroleum
WOS IDWOS:000760778400001
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/104962
Collection油气资源研究院重点实验室
Corresponding AuthorWang, Zongxiu
Affiliation1.Chinese Acad Geol Sci, Inst Geomech, Key Lab Shale Oil & Gas Geol Survey, Beijing 100081, Peoples R China
2.Shaanxi Key Lab Lacustrine Shale Gas Accumulat &, Xian 710075, Shaanxi, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Yu, Yuxi,Wang, Zongxiu,Zhang, Kaixun,et al. Effects of shear on development characteristics of organic matter pores in shale: A case study of shale in the Niutitang Formation of the well XAD1[J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,2022,211:17.
APA Yu, Yuxi,Wang, Zongxiu,Zhang, Kaixun,Feng, Xingqiang,&Cheng, Ming.(2022).Effects of shear on development characteristics of organic matter pores in shale: A case study of shale in the Niutitang Formation of the well XAD1.JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,211,17.
MLA Yu, Yuxi,et al."Effects of shear on development characteristics of organic matter pores in shale: A case study of shale in the Niutitang Formation of the well XAD1".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 211(2022):17.
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