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The influence of depositional and diagenetic processes on rock electrical properties: A case study of the Longmaxi shale in the Sichuan Basin
Zhang, Bing1,2,4; Wen, Huaguo1,3; Qing, Hairuo4; Yang, Kai2; Luo, Yuan3; Yang, Hongyu2; Wang, Pengwan5; He, Lanfang6; Xiao, Wei2
2022-04-01
Source PublicationJOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
ISSN0920-4105
Volume211Pages:21
AbstractPrimary depositional and diagenetic processes exert very important influences on shale gas reservoirs. Rock electrical properties are an important basis for making reservoir prediction using the electromagnetic method (EM). However, there is still a lack of understanding about the impact of the sedimentary diagenesis process on shale electrical properties, this study focuses on the impact of diagenesis on rock properties. In this study, rock electrical properties are studied based on electromagnetic experiments. We systematically studied the lithofacies of different depositional paleoenvironments and diagenetic processes, and the influence of diagenetic evolution on the rock electrical properties was discussed, by means of X-ray diffraction (XRD) analysis, field-emission scanning electron microscopy (FE-SEM), low-temperature nitrogen adsorption (LTNA), and trace element (TE) geochemical analysis. Based on the study of mineral composition, grain assemblages and pore systems, we identified four lithofacies in the Longmaxi Formation: siliceous shale, siliceous-argillaceous mixed shale, silty shale and argillaceous shale. Redox proxies (U/Th, V/Cr, and Ni/Co) indicate that the siliceous shale was deposited in a relatively anoxic and reducing environment, indicating a deep-water shelf depositional paleo-environment. The siliceous-argillaceous shale, silty shale and argillaceous shale were deposited under a relatively dysoxic-oxic environment, indicating a shallow-water shelf depositional paleoenvironment. The order of re-sistivity values of the lithofacies within the Longmaxi Formation is 36.78 omega m (siliceous shale), 66.81 omega m (siliceous-argillaceous mixed shale), 79.54 omega m (silty shale), and 107.00 omega m (argillaceous shale), and the re-sistivity decreases with an increase in porosity. The siliceous shale has the most abundant authigenic quartz, which filled the primary pores forming a rigid framework during the gas window, inhibited compaction, increased the distribution of organic matter (OM), and enhanced the development of OM pores. The high TOC content and high maturity of siliceous shale at the bottom of Longmaxi Formation make the OM pores more developed. Pyrite, conductive fluid and pore network under the main control of OM pores in shale form a conductive circuit when AC voltage is input, which increases the exchange capacity of cations and leads to the phenomenon of low resistivity. The interconnected OM pore network, both depositionally and diagenetically derived, affects the electrical properties of the Longmaxi shale. This study reveals that electrical properties of shale rocks and its variations can be impacted by the depositional environment and diagenetic processes. This work provides resistivity parameters for the electromagnetic exploration of shale gas under complex terrain conditions and provides a theoretical basis for later interpretation.
KeywordLithofacies Depositional environment Diagenetic processes Rock electrical properties Organic matter pores
DOI10.1016/j.petrol.2022.110119
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS KeywordFORT-WORTH BASIN ; MISSISSIPPIAN BARNETT SHALE ; ORGANIC-RICH SHALE ; BLACK SHALE ; CHINA IMPLICATIONS ; WUFENG FORMATION ; GAS EXPLORATION ; RESERVOIR ; MATTER ; LITHOFACIES
Language英语
Funding ProjectNational Natural Science Foundation of China[91755215] ; National Natural Science Foundation of China[41502111] ; National Natural Science Foundation of China[U1262206]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Petroleum
WOS IDWOS:000760807800001
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/104986
Collection矿产资源研究院重点实验室
Corresponding AuthorWen, Huaguo
Affiliation1.Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Peoples R China
2.Chengdu Univ Technol, Earth Explorat & Informat Technol Key Lab, Minist Educ, Chengdu 610059, Peoples R China
3.Chengdu Univ Technol, Inst Sedimentary Geol, Chengdu 610059, Peoples R China
4.Univ Regina, Dept Geol, Regina, SK S4S 0A2, Canada
5.PetroChina Hangzhou Inst Petr Geol, Hangzhou 310023, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Bing,Wen, Huaguo,Qing, Hairuo,et al. The influence of depositional and diagenetic processes on rock electrical properties: A case study of the Longmaxi shale in the Sichuan Basin[J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,2022,211:21.
APA Zhang, Bing.,Wen, Huaguo.,Qing, Hairuo.,Yang, Kai.,Luo, Yuan.,...&Xiao, Wei.(2022).The influence of depositional and diagenetic processes on rock electrical properties: A case study of the Longmaxi shale in the Sichuan Basin.JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,211,21.
MLA Zhang, Bing,et al."The influence of depositional and diagenetic processes on rock electrical properties: A case study of the Longmaxi shale in the Sichuan Basin".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 211(2022):21.
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