Induced polarization study based on marine rich organic shale in Southern China

• 作 者: Pengfei Li Liangjun Yan Gang Yu Xuejun Liu Kui Xiang Zhigang Wang
• 机 构: Key Laboratory of Exploration Technologies for Oil and Gas Resources(Yangtze University)Wuhan 430100
• 出 处: 2014年中国地球科学联合学术年会
• 发表日期: 2014年5期

　　Currently,shale gas as unconventional energy has entered our exploration area.Geological study has showed that the rich shale in southern China has good quality for exploration.Due to the unique storage condition and continuous complicated accumulation pattern of shale gas,it is difficult to use conventional geophysical method to predict sweet spots.According to geological deposition theory,the TOC is the basic key element that controls the form of pyrite in the marine sediment under deep water deposition environment.There is a close relationship between the TOC and pyrite in such deep water deposition environment.In this paper we have found that pyrite plays an important role in the prediction for TOC.Through the laboratory measurement analysis and joint inversion of the complex resistivity and phase,the marine rich organic shale samples showed low resistivity and high polarizability.So we think that Induced Polarization (IP) electromagnetic exploration method is a new approach to evaluate the shale gas formation effectively and application showed that IP results were in good agreement with the seismic prediction for sweet spots.