Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (2): 68-79.doi: 10.12108/yxyqc.20230207

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics and main controlling factors of oolitic shoal reservoirs of Triassic Feixianguan Formation in eastern Kaijiang-Liangping trough, Sichuan Basin

WEN Wen1, YANG Xiyan2,3, XIANG Man1, TAO Xiayan1, YANG Rong2,3, LI Yang2,3, FAN Jiaxing2,3, PU Baiyu1   

  1. 1. Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610500, China;
    3. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
  • Received:2022-06-01 Revised:2022-06-28 Online:2023-03-01 Published:2023-03-07

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Abstract: Based on core observation, micro thin section identification and scanning electron microscope analysis, combined with sequence division, the reservoir characteristics and controlling factors of Triassic Feixianguan Formation in eastern Kaijiang-Liangping trough of Sichuan Basin were studied. The results show that:(1) The reservoirs of Triassic Feixianguan Formation are dominated by oolitic dolomite and fine silty dolomite in TieshanpoPuguang area, and oolitic dolomite(with gravel, sand and bean grains) in Dukouhe -Qilibei area, and the original structural components of oolitic rocks are better preserved.(2) The reservoirs in the study area are characterized by multi-stage development. The reservoirs in Tieshanpo-Puguang area are developed in ssq1, ssq2 and ssq3 sequences, with the characteristics of early development, large thickness and wide distribution area, and type Ⅰ, Ⅱ and Ⅲ reservoirs are developed. The reservoirs in Dukouhe Qilibei area are developed in ssq2 and ssq3 sequences, which are late developed, small in thickness and limited in distribution area, and are dominated by type Ⅱ and Ⅲ reservoirs.(3) Sedimentary palaeogeomorphology and sea-level change control the development stages and thickness of oolitic shoal reservoirs in the study area. When sea-level began to decline in the middle and late stages of ssq1, oolitic shoal reservoirs began to develop in the paleogeomorphic highlands with large thickness and obvious dolomitization.(4) The water energy in steep slope and gentle slope margin slope zones affects the types of oolitic shoal sediments, provides a material basis for diagenetic dissolution and dolomitization, and thus controls the physical properties and scale of the reservoir.

Key words: oolitic shoal reservoir, paleogeomorphology, sea-level change, sequence division, Feixianguan Formation, Triassic, Kaijiang-Liangping trough, Sichuan Basin

CLC Number: 

  • TE122.2
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