Key Laboratory of Shale Gas Exploration;
Ministry of Land and Resources;
Chongqing Institute of Geology and MineralResources;
Chongqing 400042;
Chongqing Engineering Research Center for Shale Gas Resource & Exploration;
Chongqing Institute of Geology andMineral Resources;
Chongqing 400042;
Chongqing Shale Gas Research Centre of State Key Laboratory of Petroleum Resource and Prospecting;
ChongqingInstitute of Geology and Mineral Resources;
Chongqing 400042;