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A Caprock Evaluation Methodology for Underground Gas Storage in a Deep Depleted Gas Reservoir: A Case Study for the X9 Lithologic Trap of Langgu Sag, Bohai Bay Basin, China

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  • Shanpo Jia

    (Institute of Unconventional Oil & Gas, Northeast Petroleum University, Daqing 163318, China
    State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China)

  • Caoxuan Wen

    (Institute of Unconventional Oil & Gas, Northeast Petroleum University, Daqing 163318, China)

  • Xiaofei Fu

    (Institute of Unconventional Oil & Gas, Northeast Petroleum University, Daqing 163318, China)

  • Tuanhui Liu

    (Exploration and Development Research Institute of Huabei Oilfield Company, CNPC, Renqiu 062552, China)

  • Zengqiang Xi

    (Exploration and Development Research Institute of Huabei Oilfield Company, CNPC, Renqiu 062552, China)

Abstract

The evaluation of caprocks’ sealing capacity is exceedingly important for depleted gas reservoirs to be reconstructed into gas storage. In this paper, based on the physical sealing mechanism of caprock, four aspects of ten indexes of caprock quality evaluation were firstly selected, and the related classification standards were established. Secondly, based on the rock mechanical sealing mechanism, elastic and plastic indexes were selected to characterize the mechanical brittleness of caprock, and a brittleness evaluation method of caprock based on complete stress-strain curves was established. Then, a systematic comprehensive evaluation model (including 5 aspects and 12 evaluation indexes) for the sealing capacity of gas storage caprock was proposed, and the analytic hierarchy process (AHP) was used to determine the weight of the 12 indexes in the evaluation model, and the formula for calculating the suitability of the caprock sealing capacity was established. Finally, the geological data, laboratory, and field test data, including X-ray diffraction, poro-permeability test, displacement pressure, and tri-axial compression test, were used for the caprock sealing capacity evaluation of the X9 depleted gas reservoir, and the result from this model showed that the caprock quality is suitable for underground gas storage.

Suggested Citation

  • Shanpo Jia & Caoxuan Wen & Xiaofei Fu & Tuanhui Liu & Zengqiang Xi, 2022. "A Caprock Evaluation Methodology for Underground Gas Storage in a Deep Depleted Gas Reservoir: A Case Study for the X9 Lithologic Trap of Langgu Sag, Bohai Bay Basin, China," Energies, MDPI, vol. 15(12), pages 1-22, June.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:12:p:4351-:d:838789
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    References listed on IDEAS

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    1. Natasha Trujillo & Dylan Rose-Coss & Jason E. Heath & Thomas A. Dewers & William Ampomah & Peter S. Mozley & Martha Cather, 2021. "Multiscale Assessment of Caprock Integrity for Geologic Carbon Storage in the Pennsylvanian Farnsworth Unit, Texas, USA," Energies, MDPI, vol. 14(18), pages 1-26, September.
    2. Małgorzata Słota-Valim & Andrzej Gołąbek & Wiesław Szott & Krzysztof Sowiżdżał, 2021. "Analysis of Caprock Tightness for CO 2 Enhanced Oil Recovery and Sequestration: Case Study of a Depleted Oil and Gas Reservoir in Dolomite, Poland," Energies, MDPI, vol. 14(11), pages 1-32, May.
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