Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (6): 135-144.doi: 10.12108/yxyqc.20210614

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Multi-stage fluid activity characteristics of Wufeng-Longmaxi Formation in Ningxi area, southern Sichuan Basin

LI Xiaojia1,2, DENG Bin1,2, LIU Shugen1,2,3, WU Juan1,2, ZHOU Zheng1,2, JIAO Kun1,2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    2. College of Energy, Chengdu University of Technology, Chengdu 610059, China;
    3. Xihua University, Chengdu 610039, China
  • Received:2021-04-22 Revised:2021-07-18 Online:2021-12-01 Published:2021-11-25

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Abstract: Calcite veins are commonly developed in organic-rich shale, and their formation process and mechanism have important indications for hydrocarbon-generating reservoirs and accumulations. In order to clarify the correlation between multi-stage fluid activity characteristics of the target strata and the regional tectonic movement process, oil and gas accumulation, based on the hydrocarbon-bearing system accumulation dynamics, through core-slice observation, carbon and oxygen isotope analysis, fluid inclusion temperature measurement, combined with the sedimentary and structural evolution characteristics of Sichuan Basin and the surrounding areas, multi-phase fluid activity characteristics, recovery burial history and thermal history in Ningxi area were analyzed. The results show the carbon and oxygen isotopes are different in depth, they are controlled by fluid sources, depositional environment, temperature, etc., and they can be divided into two stages of fluids based on isotope characteristics. The first stage of fluid is mainly active in the Long-11 sub-member, which is a liquid hydrocarbon fluid with a depth of 3 870-3 950 m, the range of δ13C in the vein is -6.56‰—-1.58‰, with an average value of -3.45‰, and the range of δ18O is -13.72‰—-11.06‰, with an average value of -13.32‰. The carbon isotope is depleted, and the homogenization temperature of the fluid inclusion in the veins is concentrated at 120-140 ℃, corresponding to the oil-generating stage of the Early Triassic. The second stage of fluid is mainly active in the Long-12 submember, which is a high-temperature methane-rich organic fluid, with a depth of 3 830-38 90 m. The δ13C ranges from- 13.27‰ to -12.16‰, with an average value of -12.72‰, the range of δ18O is -9.06‰—-6.61‰, with an average value of -7.84‰. The carbon isotope is severely depleted, and the homogenization temperature of the fluid inclusions in the veins is concentrated at 160-180 ℃, 200-220 ℃, corresponding to the oil pyrolysis gas generation stage in Late Jurassic. The shale gas reservoir was in a high-overpressure state during the two stages of fluid activity, and the depositional environment affected the preservation conditions. The research results can provide certain theoretical support for the study of shale gas accumulation and preservation conditions in southern Sichuan Bain.

Key words: carbon and oxygen isotopes, multi-stage fluid activity, Wufeng-Longmaxi Formation, southern Sichuan Basin

CLC Number: 

  • TE122.3
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