Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (1): 78-87.doi: 10.12108/yxyqc.20240108

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Accumulation characteristics and main controlling factors of tight sandstone of Jurassic Shaximiao Formation in southwestern Sichuan Basin

WANG Xiaojuan1, CHEN Shuangling1, XIE Jirong2, MA Hualing2, ZHU Deyu1, PANG Xiaoting1, YANG Tian3, LYU Xueying4   

  1. 1. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China;
    2. PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China;
    3. State Key Laboratory of Oil and Gas Reservior Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    4. School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
  • Received:2022-09-19 Revised:2022-11-09 Online:2024-01-01 Published:2024-01-02

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Abstract: The data of geological structures, organic geochemistry, reservoir properties and lithologies were used to analyze the accumulation conditions and main controlling factors of tight sandstone gas of Jurassic Shaximiao Formation in southwestern Sichuan Basin from four aspects such as source rocks, reservoir properties, effective cap rocks and migration pathways, and the favorable areas for tight gas reservoirs were predicted. The results show that:(1) Jurassic Shaximiao Formation in southwestern Sichuan Basin has good accumulation conditions for tight gas reservoirs. The organic matters in the coal measure source rocks of the fifth member of Triassic Xujiahe Formation are mainly of type Ⅲ kerogen, with an average TOC value of 3.31% and Ro of 0.70%-1.75%, which provides a good material basis for the accumulation of coal-bed methane in Shaximiao Formation. The overlying Suining Formation developed thick mudstone, with a mudstone-formation ratio greater than 0.8 and high breakdown pressure, providing a good cap rock. The widely developed gas source faults in the area provide good migration pathways for oil and gas.(2) The size of the tight sandstone gas reservoirs in the study area is controlled by the distance between the source and reservoir and reservoir properties. The geological reserves of the gas reservoir are positively correlated with reservoir properties and have a parabolic relationship with the distance between the source and reservoir. The enrichment of tight gas is controlled by the source-reservoir-cap assemblage. When the source and reservoir are separated and the regional cap is covered, the tight gas is enriched under the regional cap below the reservoir. When the source and reservoir are separated and the regional cap is cut, the dominant reservoirs are multilayered and enriched. The hydrocarbon generation potential of source rocks and migration pathways control the natural gas charging mode. The overall charging degree in the area is high, and the accumulation conditions for lateral migration and expulsion of source rocks are better than those for vertical migration and expulsion.(3) Geological reserves are linearly and positively correlated with accumulation index, with a correlation coefficient greater than 0.8. Areas with accumulation index greater than 0.4, mudstone-formation ratio greater than 0.5 and good fault sealing, are favorable for gas reservoir distribution. Tight gas reservoirs of the first member of Shaximiao Formation are mainly distributed in Minshan-Qionglai-Xinjin areas, Tianfu gasbearing areas, while the tight gas reservoirs of the second member of Shaximiao Formation are mainly distributed around Pujiang, Meishan, and Chengdu.

Key words: tight sandstone gas, accumulation conditions, distance between source and reservoir, reservoir properties, source-reservoir-cap assemblage, Shaximiao Formation, Jurassic, southwestern Sichuan Basin

CLC Number: 

  • TE122.1
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