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Comparative study of porosity test methods for shale

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Abstract

Porosity is important in the assessment of gas shale reservoirs and has been widely tested as a basic characteristic of shale. Different test methods were employed to test the porosity, yet inconsistencies were found among the samples, testing methods, and researches in the Longmaxi Formation of the Sichuan Basin. In this paper, in order to determine the source of the inconsistencies, seven test methods are undertaken and the test results are compared intensely. The results show that the inconsistencies are due to sampling variations, test method limits, and sample sizes. It is suggested to test porosity with a relative big sample and by the method capable of covering a broad test range, to reduce the influence of sampling, testing method limit, and sample size. Furthermore, it needs to notice the test protocol, which can introduce unachieved status. Especially the water saturation has significant effect on shale porosity. In addition, the drying-wetting cycles could induce cracks in shale as well; hence, it is important to store the samples carefully, avoiding artificial porosity.

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Acknowledgments

We are also grateful for the constructive comments from the reviewers and our editor.

Funding

This study was financially supported by the National Natural Science Foundation of China under grant numbers 41702147 and 11872258.

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Authors and Affiliations

  1. Key Laboratory of Deep Earth Science and Engineering, Ministry of Education, Sichuan University, Chengdu, 610065, China

    Zhiqiang Huang, Yao Zhang, Lingzhi Xie & Li Ren

  2. Department of Civil Engineering, College of Architecture and environment, Sichuan University, Chengdu, 610065, China

    Zhiqiang Huang, Yao Zhang, Lingzhi Xie & Peng Zhao

  3. Institute of New Energy and Low-carbon Technology, Sichuan University, Chengdu, 610065, China

    Lingzhi Xie & Bo He

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  1. Zhiqiang Huang
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  2. Yao Zhang
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Correspondence to Yao Zhang.

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Responsible Editor: Liang Xiao

Highlights

• Seven porosity testing methods are undertaken and compared.

• Source of inconsistencies in porosity are analyzed.

• The importance of careful sample storage and test protocol is revealed.

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Huang, Z., Zhang, Y., Xie, L. et al. Comparative study of porosity test methods for shale. Arab J Geosci 13, 94 (2020). https://doi.org/10.1007/s12517-020-5086-5

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