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Volume 47 Issue 5
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CHEN Qianglu, XI Binbin, YOU Donghua, JIANG Hong, LIU Xian. Hydrocarbon accumulation process, and effective natural gas accumulation in Permian Changxing Formation, southeastern Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2025, 47(5): 963-973. doi: 10.11781/sysydz2025050963
Citation: CHEN Qianglu, XI Binbin, YOU Donghua, JIANG Hong, LIU Xian. Hydrocarbon accumulation process, and effective natural gas accumulation in Permian Changxing Formation, southeastern Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2025, 47(5): 963-973. doi: 10.11781/sysydz2025050963
shu

Hydrocarbon accumulation process, and effective natural gas accumulation in Permian Changxing Formation, southeastern Sichuan Basin

doi: 10.11781/sysydz2025050963
  • 1.

    SINOPEC Key Laboratory of Hydrocarbon Accumulation Mechanisms, Wuxi, Jiangsu 214126, China

  • 2.

    Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

  • Received Date: 2024-10-11
  • Rev Recd Date: 2025-08-05
  • Publish Date: 2025-09-28
    Abstract
  • The Permian Changxing Formation in the southeastern Sichuan Basin has complex natural gas accumulation patterns. Using analysis methods such as thermal evolution history reconstruction, rock thin sections, mineral isotopes, and fluid inclusions, this study investigated the hydrocarbon generation process of source rocks, reservoir diagenesis and pore evolution, and thermal cracking records of paleo-oil reservoirs, thereby revealing the evolution process of natural gas accumulation in the Changxing Formation. The study showed that the development of high-quality reservoirs was controlled by grain shoal facies, reef facies, and dolomitization. During the Middle and Late Jurassic, crude oil charging formed paleo-oil reservoirs, which subsequently underwent phase transformation in the Late Jurassic to Early Cretaceous. This process involved in-situ thermal cracking of crude oil accompanied by partial sulfate reduction, transforming the paleo-oil reservoirs into high-temperature, high-pressure gas reservoirs. During the Himalayan orogeny, the intense compressional deformation in southeastern Sichuan caused positional readjustment of paleo-gas reservoirs. The favorable preservation conditions in weak structural deformation zones proved critical for the sustained preservation of these gas reservoirs. The reservoir pores contained pyrobitumen and dry gas, while the strong deformation zones exhibited poorer preservation conditions, leading to natural gas leakage. In addition to the pyrobitumen formed by oil cracking, the reservoir pores also developed late-stage calcite cementation, resulting in reservoir densification. Therefore, the preservation conditions of high-quality reservoirs and gas accumulations in the Permian Changxing Formation are crucial for the effective large-scale accumulation of natural gas in the southeastern Sichuan Basin.

     

    • The authors CHEN Qianglu, XI Binbin, YOU Donghua, JIANG Hong, and LIU Xian are employees of the sponsor of this journal, and they did not take part in peer review or decision making of this article.
    CHEN Qianglu was responsible for the overall research, drafting the initial manuscript, and revising the final version. XI Binbin was responsible for the study of thermal cracking of paleo-oil reservoirs, and revised the manuscript. YOU Donghua was responsible for the study of diagenesis. JIANG Hong was responsible for the study of thermal cracking of paleo-oil reservoirs. LIU Xian participated in data organization and figure preparation. All authors have read the final version of the paper and consented to its submission.
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