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The Influence of Hydrothermal Activity on the Long-Distance Migration and Accumulation of Hydrocarbons: A Case Study from the Y8 Area in the Songnan-Baodao Sag of Qiongdongnan Basin

Author

Listed:
  • Jun Gan

    (Zhanjiang Branch of China National Offshore Oil Corporation, Zhanjiang 524057, China)

  • Shuling Xiong

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
    Unconventional Petroleum Research Institute, China University of Petroleum, Beijing 102249, China)

  • Gang Liang

    (Zhanjiang Branch of China National Offshore Oil Corporation, Zhanjiang 524057, China)

  • Zhiye Gao

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
    Unconventional Petroleum Research Institute, China University of Petroleum, Beijing 102249, China)

  • Xing Li

    (Zhanjiang Branch of China National Offshore Oil Corporation, Zhanjiang 524057, China)

  • Wei Yang

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
    Unconventional Petroleum Research Institute, China University of Petroleum, Beijing 102249, China)

  • Zhenxue Jiang

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
    Unconventional Petroleum Research Institute, China University of Petroleum, Beijing 102249, China)

  • Yaohua Wang

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
    Unconventional Petroleum Research Institute, China University of Petroleum, Beijing 102249, China)

Abstract

The Qiongdongnan (QDN) basin in the northwestern South China Sea has been shown to be rich in petroleum resources and has significant exploration potential for deepwater oil and gas resources. Therefore, it is of great significance to clarify the gas accumulation process in the deepwater area of the QDN basin, specifically the Y8 area. In this study, fluid inclusion analysis, including the identification and localization of fluid inclusions under a microscope, laser Raman spectrum analysis and homogenization temperature (T h ) measurement, reconstruction of the thermal evolution burial history, geochemical analysis, and typical seismic section analysis were comprehensively used to interpret the gas accumulation process of the Y8 area. The laser Raman spectrum analysis results of fluid inclusions verified the existence of methane and confirmed the hydrocarbon charging event in this area. However, the Th of fluid inclusions in the reservoir, the mixed compositions of hydrothermal compositions (H 2 S + SO 2 ) and hydrocarbons (methane) in the fluid inclusions, and the low T max values of some wells in the Y8 area comprehensively confirmed that the coincidence of hydrothermal activity with the accumulation process affected the long-distance gas accumulation of the Y8 area. The hydrothermal activity was also confirmed by the presence of fluid diapirs in seismic profiles of the Y8 area. Furthermore, the hydrocarbon accumulation process was reconstructed using the modified thermal evolution history considering the effect of hydrothermal activity. Overall, this study attributed the high T h of fluid inclusions in the reservoirs of the Y8 area to hydrothermal activity and proposed a long-distance migration model of hydrocarbon accumulation coinciding with hydrothermal activity, both of which are beneficial to understanding the accumulation process of the Y8 area.

Suggested Citation

  • Jun Gan & Shuling Xiong & Gang Liang & Zhiye Gao & Xing Li & Wei Yang & Zhenxue Jiang & Yaohua Wang, 2022. "The Influence of Hydrothermal Activity on the Long-Distance Migration and Accumulation of Hydrocarbons: A Case Study from the Y8 Area in the Songnan-Baodao Sag of Qiongdongnan Basin," Energies, MDPI, vol. 15(9), pages 1-19, April.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:9:p:3089-:d:800343
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    References listed on IDEAS

    as
    1. Ru Jia & Caiwei Fan & Bo Liu & Xiaofei Fu & Yejun Jin, 2021. "Analysis of Natural Hydraulic Fracture Risk of Mudstone Cap Rocks in XD Block of Central Depression in Yinggehai Basin, South China Sea," Energies, MDPI, vol. 14(14), pages 1-21, July.
    2. Xin Wang & Zhenghuan Lu & Meijun Li & Hao Guo & Zhili Zhu & Xiaohan Li & Chengyu Yang & Bang Zeng & Fangzheng Wang & Zichao Ran, 2022. "Petroleum Charging History of the Paleogene Sandstone Reservoirs in the Huangtong Sag of the Fushan Depression, South China Sea," Energies, MDPI, vol. 15(4), pages 1-20, February.
    3. Xuemin Wu & Qianyong Liang & Yun Ma & Yaohong Shi & Zhen Xia & Lihua Liu & Matthias Haeckel, 2018. "Submarine Landslides and their Distribution in the Gas Hydrate Area on the North Slope of the South China Sea," Energies, MDPI, vol. 11(12), pages 1-18, December.
    4. Runze Yang & Xianzheng Zhao & Changyi Zhao & Xiugang Pu & Haitao Liu & Hongjun Li & Lixin Fu & Ying Tang, 2021. "Hydrocarbon Charging and Accumulation in the Permian Reservoirs of the Wumaying Buried Hill, Huanghua Depression, Bohai Bay Basin, China," Energies, MDPI, vol. 14(23), pages 1-21, December.
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