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Petroleum Science >2018,??Issue 3:??498-509 DOI: https://doi.org/10.1007/s12182-018-0249-7

Study of the relationship between fractures and highly productive shale gas zones, Longmaxi Formation, Jiaoshiba area in eastern Sichuan Open?Access

文章信息

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作者：Yu-Feng Li, Wei Sun, Xi-Wu Liu, Dian-Wei Zhang, Yan-Chun Wang and Zhi-Yuan Liu
作者單位：

School of Geophysics and Information Technology, China University of Geoscience, Beijing 100083, China; Research Institute of Petroleum Exploration and Development, Sinopec, Beijing 100083, China,Research Institute of Petroleum Exploration and Development, Sinopec, Beijing 100083, China,Research Institute of Petroleum Exploration and Development, Sinopec, Beijing 100083, China,Research Institute of Petroleum Exploration and Development, Sinopec, Beijing 100083, China,School of Geophysics and Information Technology, China University of Geoscience, Beijing 100083, China and Research Institute of Petroleum Exploration and Development, Sinopec, Beijing 100083, China

投稿時(shí)間：2017-10-16
引用方式：Li, YF., Sun, W., Liu, XW. et al. Pet. Sci. (2018) 15: 498. https://doi.org/10.1007/s12182-018-0249-7

文章摘要

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.

關(guān)鍵詞

    Azimuthal anisotropy, Fracture prediction, Shale, Shale gas, Shale reservoir preservation conditions