Study of the relationship between fractures and highly productive shale gas zones, Longmaxi Formation, Jiaoshiba area in eastern Sichuan
投稿时间:2017-10-16  
英文关键词:Azimuthal anisotropy, Fracture prediction, Shale, Shale gas, Shale reservoir preservation conditions
基金项目:The authors would like to thank the editors and reviewers for their valuable comments. This work is supported by the National Key Basic Research Program of China (973 Program, No. 2014CB239104), National Science and Technology Major Project (No. 2017ZX05049002-005), Sinopec Basic Prospect Project (No. G5800-16-ZS-KJB043) and NSFC-Sinopec Joint Key Project (No. U1663207).
作者单位
Yu-Feng Li School of Geophysics and Information Technology, China University of Geoscience, Beijing 100083, China
Research Institute of Petroleum Exploration and Development, Sinopec, Beijing 100083, China 
Wei Sun Research Institute of Petroleum Exploration and Development, Sinopec, Beijing 100083, China 
Xi-Wu Liu Research Institute of Petroleum Exploration and Development, Sinopec, Beijing 100083, China 
Dian-Wei Zhang Research Institute of Petroleum Exploration and Development, Sinopec, Beijing 100083, China 
Yan-Chun Wang School of Geophysics and Information Technology, China University of Geoscience, Beijing 100083, China 
Zhi-Yuan Liu Research Institute of Petroleum Exploration and Development, Sinopec, Beijing 100083, China 
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英文摘要:
      Shale fractures are an important factor controlling shale gas enrichment and high-productivity zones in the Longmaxi Formation, Jiaoshiba area in eastern Sichuan. Drilling results have, however, shown that the shale fracture density does not have a straightforward correlation with shale gas productivity. Based on logging data, drilling and seismic data, the relationship between shale fracture and shale gas accumulation is investigated by integrating the results of experiments and geophysical methods. The following conclusions have been drawn: (1) Tracer diffusion tests indicate that zones of fracture act as favorable channels for shale gas migration and high-angle fractures promote gas accumulation. (2) Based on the result of azimuthal anisotropy prediction, a fracture system with anisotropy strength values between 1 and 1.15 represents a moderate development of high-angle fractures, which is considered to be favorable for shale gas accumulation and high productivity, while fracture systems with anisotropy strength values larger than 1.15 indicate over-development of shale fracture, which may result in the destruction of the shale reservoir preservation conditions.
Yu-Feng Li,Wei Sun,Xi-Wu Liu,Dian-Wei Zhang,Yan-Chun Wang,Zhi-Yuan Liu,2018.Study of the relationship between fractures and highly productive shale gas zones, Longmaxi Formation, Jiaoshiba area in eastern Sichuan.Petroleum Science,15(3):498~509.
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