Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (1): 1-11.doi: 10.12108/yxyqc.20230101

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics and exploration potential of shale reservoirs of Permian Longtan Formation in southern Sichuan Basin

YANG Yueming1, ZHANG Shaomin2,3, JIN Tao2, MING Ying2, GUO Ruiying2, WANG Xingzhi4, HAN Luyuan2   

  1. 1. PetroChina Southwest Oil and Gas Field Company, Chengdu 610051, China;
    2. Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China;
    3. Sichuan Key Laboratory of Shale Gas Evaluation and Exploitation, Chengdu 610213, China;
    4. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
  • Received:2022-04-17 Revised:2022-05-13 Online:2023-01-01 Published:2023-01-06

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Abstract: The Longtan Formation is a new important layer for shale gas exploration and development in Sichuan Basin. The shale reservoirs of Permian Longtan Formation in southern Sichuan Basin was comprehensively studied by means of polarizing microscope identification，field emission scanning electron microscope analysis，X-ray diffraction test，organic carbon content determination，high-pressure mercury injection analysis and on-site analytical gas experiment. The results show that: (1) The Permian Longtan Formation in southern Sichuan Basin is a set of continental meandering river deposits，and shale is developed in fluvial deposits. Its minerals are mainly quartz and clay minerals，with a small amount of carbonate minerals. (2) There are mainly intergranular (marginal) pores and microfractures developed in the shale reservoirs in the study area，intragranular pores and dissolved pores are locally developed，and organic pores are rarely developed，among which microfractures between clay minerals are the most developed. The pore structures are mainly microporous，followed by mesoporous (with pore size of 2-50 nm). The pore size is generally small，with poor sorting，the radius difference between pore and throat is large，and the heterogeneity is strong. (3) In the shale reservoirs in the study area，the gas content in coal rock is the highest，followed by carbonaceous mudstone and mudstone，and the gas content in argillaceous siltstone，siltstone and fine sandstone is the lowest. Compared with the shale reservoir of Longmaxi Formation，the mudstone of Longtan Formation has better porosity and total gas content and poor permeability，and the porosity and total gas content of carbonaceous mudstone are the best. (4) The Permian Longtan Formation in the study area has great exploration potential. The organic matter in the source rocks is mainly type Ⅲ，followed by typeⅡ2. The average value of Ro is about 2.8%，reaching the stage of high maturity. TOC content varies widely， and TOC content in carbonaceous mudstone is generally greater than 15%. (5) Alluvial plain is developed in Permian Longtan Formation in southern Sichuan Basin，being rich in organic shale，with good shale gas formation conditions. The estimated natural gas resources are about 2.4×1012 m3，and the favorable exploration area is mainly located in Gulin-Xuyong area in southern Sichuan Basin.

Key words: interlayer microfracture, high maturity stage, shale gas, fluvial deposit, Longtan Formation, Permian, Gulin-Xuyong area, Sichuan Basin

CLC Number: 

  • TE122.2
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