Gas-in-Place(GIP) Variation and Main Controlling Factors for the Deep Wufeng-Longmaxi Shales in the Luzhou Area of the Southern Sichuan Basin,China  

作　　者：Wei Wu Peng Cheng Shenyang Liu Chao Luo Haifeng Gai Haitao Gao Qin Zhou Tengfei Li Kesu Zhong Hui Tian 

机构地区：[1]Research Institute of Shale gas,PetroChina Southwest Oil and Gas Fields,Chengdu 610002,China [2]State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China [3]CAS Center for Excellence in Deep Earth Science,Guangzhou 510640,China

出　　处：《Journal of Earth Science》2023年第4期1002-1011,共10页地球科学学刊（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.41925014,42173031);the Natural Science Foundation of Guangdong Province (No.2021A1515011381);the Project of PetroChina Southwest Oil and Gas Fields (No.XNS-YYY-JS2021-49)。

摘　　要：The Wufeng-Longmaxi Formation shales with burial depths > 3 500 m in the southern Sichuan Basin are believed to have large shale gas potentials.However,the reservoir properties and gasin-place(GIP) contents of these shales exhibit variations across different sublayers.In this study,a set of Wufeng-Longmaxi shales with burial depths of 4 000–4 200 m was derived from the Well Y101H2 in the Luzhou area,and the differences in geological and geochemical characteristics,porosity,water saturation and GIP content of various sublayer shales were investigated.The results indicate that the TOC content and effective porosity of the upper(LMX1-4) and lower(LMX1-3) sublayer shales of the first member of the Longmaxi Formation are better than those of the Wufeng Formation(WF) shales,which results in the LMX1-4 and LMX1-3 shales having higher GIP contents than the WF shales.The GIP contents of the LMX1-3 shales are higher than those of the LMX1-4 shales,and this is likely because the organic matter of the LMX1-3 shales had more aquatic organisms and was preserved in a stronger reductive environment,which leads to a stronger gas generation potential.In contrast to the middle-shallow LMX1-4 shales in the Sichuan Basin,the deep LMX1-4 shales in the Luzhou area have advantageous reservoir properties and GIP contents,and thus it is promising to synchronously exploit the deep LMX1-4 and LMX1-3 shales in some regions of the southern Sichuan Basin.

关 键 词：the Sichuan Basin Wufeng-Longmaxi Formation SHALES deep shales reservoir proper-ties GIPcontents. 

分 类 号：P618.13[天文地球—矿床学]