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Evaluation of Shale Reservoir Quality by Geophysical Logging for Shuijingtuo Formation of Lower Cambrian in Yichang Area, Central Yangtze

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Abstract

Taking the shale of Shuijingtuo Formation of Lower Cambrian in Yichang area as the research object, the shale reservoir characteristics are comprehensively evaluated and classified by fitting regression and formula calculation method in this study, using laboratory testing and geophysical logging data. The results show that the interpretation data of ECS (elemental capture spectroscopy) logging has a high correlation with the measured minerals data, which can be a good method to evaluate the minerals component of the shale. The calculated content of brittle minerals at the lower part of Shuijingtuo Formation is the relatively highest, generally more than 40%, which is the most favorable segment for fracturing. The correlation coefficient between the interpretation data of CMR (combinable nuclear magnetic resonance) logging and the result of laboratory porosity test is 0.97, which can effectively and accurately evaluate the reservoir porosity. The evaluation results show that the porosity of the lower member of Shuijingtuo Formation is generally greater than 3%, while that of the upper member is generally less than 3%. The lower segment is with the relative optimal physical conditions. There is a good correlation between the acoustic logging data and the gas bearing content testing results. A gas bearing content evaluation model is established. The results show that the gas bearing content of the lower 20 m shale is generally more than 2%, indicating that the lower part is a shale gas enrichment segment. Mechanical parameters such as Young modulus, Poisson ratio and brittleness index of shale reservoir are evaluated by using the logging data of P-wave time difference and S-wave time difference. The continuous 15 m shale at the lower part is with the relatively optimal low Poisson ratio, high Young modulus and high brittleness index, developing the optimum brittle condition. Based on the evaluation and classification of above parameters, the shale is divided into three types. The Type I is the optimal, mainly located at the bottom. Its thickness is 8.5 m in total. The Type II mainly develops at the middle part. The Type III is the worst, mainly at the upper part.

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Acknowledgments

This work was supported by the Fundamental and Commonweal Geological Survey of Oil and Gas of China (Nos. DD20179615 and DD20160194), and the National Science and Technology Major Project of China (No. 2016ZX05034001002). We are grateful to the anonymous reviewers and the editors for their constructive comments which greatly improved manuscript. The final publication is available at Springer via https://doi.org/10.1007/s12583-020-1051-1.

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Authors and Affiliations

  1. Wuhan Center, China Geological Survey, Wuhan, 430205, China

    Xiaohong Chen, Lin Chen, An Liu, Shengyuan Luo, Hai Li & Peijun Li

  2. Energy and Geoscience Institute, University of Utah, Salt Lake City, 84108, USA

    Lin Chen & Shu Jiang

  3. Hubei Key Laboratory of Marine Geological Resources, China University of Geosciences, Wuhan, 430074, China

    Lin Chen

  4. College of Marine Science and Technology, China University of Geosciences, Wuhan, 430074, China

    Lin Chen

  5. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan, 430074, China

    Lin Chen, Shu Jiang & Ping Chen

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Chen, X., Chen, L., Jiang, S. et al. Evaluation of Shale Reservoir Quality by Geophysical Logging for Shuijingtuo Formation of Lower Cambrian in Yichang Area, Central Yangtze. J. Earth Sci. 32, 766–777 (2021). https://doi.org/10.1007/s12583-020-1051-1

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