Logging evaluation and distribution law of Chang 7 shale gas in Xiasiwan-Yunyan area, Ordos Basin

doi:10.3969/j.issn.1672-7703.2019.01.014

Abstract

Abstract: By establishing a quantitative model using logging data, it is simple to obtain the geological information of continuous mud shale intervals, and provide basic data for shale gas geological research. In this study, based on the shale gas logging evaluation method, considering the geological characteristics, taking the core data as the correcting standard, and using the △1gR method, the AC method and the porosity -maturity correlation method, logging models were built, involving organic carbon content, porosity and maturity in the Chang 7 Member of the Yanchang Formation in the Xiasiwan-Yunyan area, Ordos Basin. Application of the models in individual wells estimated the organic carbon content from 0.5% to 6.5%, the vitrinite reflectance from 0.65% to 1.25%, and low porosity in the Chang 7 shale. Based on these data, the geological characteristics and the distribution law of the Chang 7 shale are clear, which lays a foundation for future exploration and development of shale gas.

Key words: Ordos Basin, Chang 7 Member, shale gas, logging, organic carbon content, porosity, maturity

CLC Number:

Wang Long, Zhang Jinchuan, Tang Xuan. Logging evaluation and distribution law of Chang 7 shale gas in Xiasiwan-Yunyan area, Ordos Basin[J]. China Petroleum Exploration, 2019, 24(1): 129-136.

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