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    中国百强科技报刊

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    Volume 48 Issue 1
    Jan.  2023
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    Article Contents
    Zhang Peixian, Nie Haikuan, He Xipeng, Gao Yuqiao, Zhang Zhiping, Zhou Dina, Yun Huifang, Zhou Chenxi, 2023. Paleozoic Gas Accumulation System and Stereoscopic Exploration in Southeastern Chongqing. Earth Science, 48(1): 206-222. doi: 10.3799/dqkx.2022.440
    Citation: Zhang Peixian, Nie Haikuan, He Xipeng, Gao Yuqiao, Zhang Zhiping, Zhou Dina, Yun Huifang, Zhou Chenxi, 2023. Paleozoic Gas Accumulation System and Stereoscopic Exploration in Southeastern Chongqing. Earth Science, 48(1): 206-222. doi: 10.3799/dqkx.2022.440

    Paleozoic Gas Accumulation System and Stereoscopic Exploration in Southeastern Chongqing

    doi: 10.3799/dqkx.2022.440
    • Received Date: 2022-05-13
      Available Online: 2023-02-01
    • Publish Date: 2023-01-25
    • The southeastern Chongqing is located in the basin-margin transition zone on the southeast edge of Sichuan Basin. The Paleozoic strata are well-developed, but experienced multiple tectonic periods and great strength, leading to many types of natural gas and complex accumulation conditions. In order to clarify the main types of natural gas reservoirs, the characteristics of accumulation system and the stereoscopic exploration and development potential, reduce exploration risk and cost, and improve the success rate of exploration, guided by the theory of reservoir-forming system and the thought of stereoscopic exploration, this paper studies sedimentary facies, geochemical index, reservoir type, accumulation conditions, source-reservoir matching relationship and accumulation mode, and combining the exploration and development practices, two types of intra and external source accumulation systems have been identified. The intra-source accumulation system includes shale-coal bed gas reservoirs of Longtan Formation and lime-mudstone gas reservoirs of Maokou Formation of Permian, Ordovician Wufeng Formation-Silurian Longmaxi Formation and Cambrian Shuijingtuo Formation shale gas reservoirs. The external-source accumulation system includes the sandstone gas reservoirs of Xiaoheba Formation of Silurian, the carbonate gas reservoirs of Xixiangchi Group and Shilongdong Formation of Cambrian. The suggestion of stereoscopic exploration is mainly lower shale gas of Wufeng-Longmaxi Formation, and the upper shale gas of Longtan Formation and Maokou Formation is subsidiary, and at the same time to explore the external-source of sandstone and carbonate gas reservoirs. The discovery of multiple commercial gas-bearing strata as many as possible is of great practical significance for sustainable exploration. Comprehensive study of the reservoir forming conditions and enrichment regularity of natural gas in intra-source accumulation system and external-source accumulation system, it is regarded that Nanchuan area is a favorable stereoscopic exploration area for Permian, Silurian and Cambrian strata, and Pengshui area is a favorable stereoscopic exploration area for Silurian and Cambrian strata.

       

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