Complex resistivity dispersion characteristics of shale samples in Sichuan and Guizhou area
Xiang Kui1, Hu Wenbao1, Yan Liangjun1, Zhang Chunhe2, He Weihui3, Tang Xingong1, Liu Xuejun4
1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan, Hubei 430100, China;
2. Strategic Research Center of Oil and Gas Resources, Ministry of Land and Resources, Beijing 100034, China;
3. East China Mineral Exploration and Development Bureau, Nanjing, Jiangsu 212005, China;
4. BGP Inc., CNPC, Zhuozhou, Hebei 072751, China
Abstract：Shale gas is one of the important unconventional energy resources. Laboratory measurements of wide bandwidth complex electrical characteristics of dark shale samples from Sichuan and Guizhou areas have been carried out. Results show some relationship between dispersion property of complex resistivity and the total organic content (TOC) of shale samples. DC resistivity and chargeability are obtained with inversion based on double Cole-Cole models. According to the results of mineral identification, mineral type and content play an important role in electrical characteristics of shale samples, and a rudimentary knowledge is confirmed that micro-grain pyrites can mainly account for the strong polarization effect at low frequency. Based on this feature of complex resistivity of dark shale, we propose controlled source EM method for shale gas reservoir exploration.
