Optimum Selection of Shale Gas Favorable Area of Upper Triassic in the Eastern Margin of Kangdian Uplift

doi:10.11885/j.issn.1674-5086.2021.10.14.01

Abstract

Abstract: Based on the analysis of outcrop profile, drilling and testing data of Xichang Basin in the eastern margin of Kangdian Uplift, the main indexes of organic-rich shale in Baiguawan Formation were evaluated and the shale gas selection was evaluated. The results show that: 1) Organic-rich shale of lacutrine or marsh facies is developed in the first to fourth Member of Ginguowan Formation in Xichang Basin, the thickness of the lower part of the second Member is generally 40~89 m, and the thickness of the lower part of the third member is up to 251 m. 2) Average organic carbon of Baiguowan Formation shale is 1.0%~1.6%, the organic carbon isotope of kerogen is -26.2‰~-23.2‰, and the organic matter type is II₂-III type. The R_o in the eastern Mishi Depression is 1.1%~3.0%, indicating moderate evolution degree. 3) The content of organic matter and the degree of thermal evolution are important factors for the formation of shale gas in the study area. 4) Shale gas content of Baiguowan Formation was estimated to be 1.0~1.5 m³/t with the genetic method. The favorable shale gas areas were selected with the multi-factor overlapping method, and the shale gas resources were evaluated by regions. The total shale gas resources of the favorable shale gas area of Baiguowan Formation in Xichang Basin is 7 106×10⁸ m³, among which the resources of the third Member of Baiguowan Formation is 3 094×10⁸ m³. Shale gas is expected to be discovered in the new zone and new strata in favorable areas such as Terguo and Qiliba in the east of Mishi Depression.

Key words: eastern margin of Kangdian Uplift, Baiguowan Formation of Upper Triassic, shale gas, favorable area selection, quantity of resource

CLC Number:

TE122

HE Lei, MU Bixin, YANG Ping, CHEN Yang, LIU Zhicheng. Optimum Selection of Shale Gas Favorable Area of Upper Triassic in the Eastern Margin of Kangdian Uplift[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(5): 43-56.

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