Influencing factors and quantitative prediction of gas content of deep marine shale in Luzhou block

作     者：He, Xinyang Zhang, Kun Jiang, Shu Jiang, Zhenxue Wang, Xueying Jiang, Wei Li, Jing Wu, Yijia Gao, Zhi Tang, Tian Yang, Cheng Yuan, Xuejiao Han, Fengli Wang, Zeyun Ye, Laiting 

作者机构：State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu 610500 China School of Geoscience and Technology Southwest Petroleum University Chengdu 610500 China Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences) Ministry of Education Wuhan 430074 China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum 102249 Beijing China Unconventional Petroleum Research Institute China University of Petroleum 102249 Beijing China Shale Gas Exploration and Development Project Department of CNPC Chuanqing Drilling Engineering Company Limited Chengdu 610051 China Institute of Geological Exploration and Development of CNPC Chuanqing Drilling Engineering Company Limited Chengdu 610051 China 

出 版 物：《Scientific Reports》 (Sci. Rep.)

年 卷 期：2025年第15卷第1期

页      面：1896-1896页

基　　金：open fund of Key Laboratory of Tectonics and Petroleum Resources China University of Geosciences, Wuhan, CUG National Natural Science Foundation of China, NSFC, (42102192) National Natural Science Foundation of China, NSFC Natural Science Foundation of Sichuan Province, (2024NSFSC0086) Natural Science Foundation of Sichuan Province Ministry of Education, United Arab Emirates, MoE, (TPR-2022-08) Ministry of Education, United Arab Emirates, MoE open fund of Shale Gas Evaluation and Exploitation Key Laboratory of Sichuan Province, (YSK2022010) 

主　　题：Deep marine shale Gas content Influencing factors Longmaxi formation Quantitative prediction 

摘      要：The exploration and development of deep marine shale gas has made significant breakthroughs, but factors influencing gas contents of deep marine shale are elusive, and quantitative prediction methods of gas content needs to be refined urgently. In this study, the deep marine shale of Longmaxi Formation in Luzhou area was taken as an example, vitrinite reflectance analysis, kerogen microscopy experiment, TOC content analysis, mineral composition analysis, gas content measurement, isothermal adsorption experiment, physical property analysis and argon ion polishing scanning electron microscopy experiment were carried out to find out factors affecting the gas content of deep marine shale, and a gas content prediction model has been worked out. Conclusions below have been reached: the content of adsorbed gas is mainly affected by Ro, TOC content, porosity, water saturation, clay mineral content, formation temperature and pressure;the content of free gas is mainly controlled by porosity, water saturation, formation temperature and pressure;according to the prediction models, the adsorbed gas content, free gas content and total gas content of each well were quantitatively calculated, and the study area was divided into Class I (with a total gas content ≥ 11 m3/t), Class II (with a total gas content between 9 m3/t and 11 m3/t), and Class III (with a total gas content 3/t) gas-bearing areas.