Application of comprehensive geophysical prospecting method in well siting for shale gas exploration in carbonate areas in east China
LUO Wei-Feng1(), HU Zhi-Fang1(), GAN Fu-Ping2, ZHANG Qing-Yu2, KANG Hai-Xia1, ZHANG Yun-Xiao1
1. Oil & Gas Survey Center, China Geological Survey, Beijing 100083, China 2. Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China
The drilling engineering for shale gas in carbonate areas in China is facing prominent carbonate karst. It is necessary to carry out near-surface geophysical prospecting before drilling and reasonably select the well locations in order to ensure the safety of the well site and reduce the drilling engineering risks. Taking the siting of Well Guirongye-1 in Rong'an County, Liuzhou City, Guangxi Province as an example, this study conducted the application research of well siting before drilling comprehensively using three geophysical prospecting methods, namely the high-density resistivity method, the audio-frequency magnetotellurics method, and radon survey, achieving satisfactory results. Well Guirongye-1 did not encounter a fault fracture zone near the surface, which is basically consistent with the interpretation results of comprehensive geophysical prospecting. This result indicates that the comprehensive geophysical prospecting method is feasible and effective in the siting of shale gas exploration wells in the carbonate areas in south China. This study will provide a certain reference for the well siting before drilling in similar areas in the future.
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LUO Wei-Feng, HU Zhi-Fang, GAN Fu-Ping, ZHANG Qing-Yu, KANG Hai-Xia, ZHANG Yun-Xiao. Application of comprehensive geophysical prospecting method in well siting for shale gas exploration in carbonate areas in east China. Geophysical and Geochemical Exploration, 2022, 46(4): 824-829.
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