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Microcrack Porosity Estimation Based on Rock Physics Templates: A Case Study in Sichuan Basin, China

Author

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  • Chuantong Ruan

    (School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China
    School of Mathematics and Statistics, Zhoukou Normal University, Zhoukou 466001, China)

  • Jing Ba

    (School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China)

  • José M. Carcione

    (School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China
    National Institute of Oceanography and Applied Geophysics (OGS), 34010 Trieste, Italy)

  • Tiansheng Chen

    (Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China)

  • Runfa He

    (School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China)

Abstract

Low porosity-permeability structures and microcracks, where gas is produced, are the main characteristics of tight sandstone gas reservoirs in the Sichuan Basin, China. In this work, an analysis of amplitude variation with offset (AVO) is performed. Based on the experimental and log data, sensitivity analysis is performed to sort out the rock physics attributes sensitive to microcrack and total porosities. The Biot–Rayleigh poroelasticity theory describes the complexity of the rock and yields the seismic properties, such as Poisson’s ratio and P-wave impedance, which are used to build rock-physics templates calibrated with ultrasonic data at varying effective pressures. The templates are then applied to seismic data of the Xujiahe formation to estimate the total and microcrack porosities, indicating that the results are consistent with actual gas production reports.

Suggested Citation

  • Chuantong Ruan & Jing Ba & José M. Carcione & Tiansheng Chen & Runfa He, 2021. "Microcrack Porosity Estimation Based on Rock Physics Templates: A Case Study in Sichuan Basin, China," Energies, MDPI, vol. 14(21), pages 1-18, November.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:7225-:d:670715
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    References listed on IDEAS

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    1. Wang, Jianliang & Feng, Lianyong & Steve, Mohr & Tang, Xu & Gail, Tverberg E. & Mikael, Höök, 2015. "China's unconventional oil: A review of its resources and outlook for long-term production," Energy, Elsevier, vol. 82(C), pages 31-42.
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    Cited by:

    1. Chun Zhu & Xiaojie Yang & Zhigang Tao & Jianping Sun, 2022. "Challenges and Opportunities in Rock Mechanics and Engineering—An Overview," Energies, MDPI, vol. 15(3), pages 1-3, January.
    2. Han Jin & Cai Liu & Zhiqi Guo, 2023. "Characterization of Tight Gas Sandstone Properties Based on Rock Physical Modeling and Seismic Inversion Methods," Energies, MDPI, vol. 16(22), pages 1-18, November.

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