Home > Archive>Volume 93, Issue 2, 2019 >400-419. DOI:10.1111/1755-6724.13816
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A Quantitative Evaluation of Shale Gas Content in Different Occurrence States of the Longmaxi Formation: A New Insight from Well JY-A in the Fuling Shale Gas Field, Sichuan Basin
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This research is financially supported by the Natural Science Foundation of China (NSFC; Grant 41572106) and the National Science and Technology Major Project “The enrichment conditions, evaluation technology and application of shale gas in the Sichuan Basin and its periphery” (Item No. 2017ZX05035002-006), State Key Laboratory of oil and gas resources and exploration, Chinese University of Petroleum-Beijing. We appreciate the Jianghan Oilfield Company of SINOPEC for providing us with the drilling core samples and the on-site desorption gas content. We also wish to thank the anonymous reviewers for their valuable comments that significantly improved the quality of this paper.

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    Abstract:

    Comprehensive quantitative evaluation of shale gas content and the controlling factors in different occurrence states is of great significance for accurately assessing gas-bearing capacity and providing effective well-production strategies. A total of 122 core samples from well JY-A in the Fuling shale gas field were studied to reveal the characteristics of S1l shale,15 of which were selected to further predict the shale gas content in different occurrence states, which are dependent on geological factors in the thermal evolution process. Geological parameters were researched by a number of laboratory programs, and the factors influential in controlling shale gas content were extracted by both PCA and GRA methods and prediction models were confirmed by the BE method using SPSS software. Results reveal that the adsorbed gas content is mainly controlled by TOC, Ro, SSA, PD and pyrite content, and the free gas content is mainly controlled by S2, quartz content, gas saturation and formation pressure for S1l in well JY-A. Three methods, including the on-site gas desorption method, the empirical formula method, and the multiple regression analysis method were used in combination to evaluate the shale gas capacity of well JY-A, all of which show that the overall shale gas content of well JY-A is in the range of 2.0–5.0 m3/t and that the free gas ratio is about 50%, lower than that of well JY-1. Cause analysis further confirms the tectonics and preservation conditions of S1l in the geological processes, especially the influence of eastern boundary faults on well JY-A, as the fundamental reasons for the differences in shale gas enrichment in the Jiaoshiba area.

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TANG Ling, SONG Yan, LI Qianwen, PANG Xiongqi, JIANG Zhenxue, LI Zhuo, TANG Xianglu, YU Hailong, SUN Yue, FAN Shichao, ZHU Lin.2019. A Quantitative Evaluation of Shale Gas Content in Different Occurrence States of the Longmaxi Formation: A New Insight from Well JY-A in the Fuling Shale Gas Field, Sichuan Basin[J]. Acta Geologica Sinica(),93(2):400-419

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History
  • Received:August 01,2018
  • Revised:December 20,2018
  • Online: April 19,2019
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