Geological conditions and exploration potential of shale gas of Upper Triassic Baiguowan Formation in Mishi Sag, Xichang Basin

doi:10.3969/j.issn.1672-7703.2021.05.009

Abstract

Abstract: The Upper Triassic Baiguowan Formation is a major shale series in Mishi Sag in Xichang Basin. The shale distribution
characteristics, geochemical characteristics, reservoir properties, gas bearing properties and preservation conditions are studied by
geological survey, systematic coring, core observation, and lab test, so as to investigate its geological conditions and exploration
potential of shale gas. Furthermore, these parameters are compared with other domestic continental shale series that have obtained gas discoveries. The results show that: (1) The organic rich shale of Baiguowan Formation is relatively developed in Mishi Sag,with large thickness, moderate organic carbon content, moderate maturity, high content of brittle minerals, high porosity and good gas bearing property, which has favorable geological conditions for shale gas accumulation; (2) The key parameters such as porosity,TOC, Ro and gas content of Baiguowan Formation shale in Mishi Sag are basically consistent with those of continental
shale that have obtained gas discoveries in China; (3) By comprehensively considering the development degree of organic rich
shale, burial depth, preservation and surface engineering conditions, five favorable areas of Tergo, Qiliba, Lewu, Sikai and
Xichang North are selected for shale gas exploration of Baiguowan Formation in Mishi Sag, which have great exploration and
development potential.

CLC Number:

TE122.1

He Wei, Chen Yang, Fang Kun, Liu Zhicheng, Mu Bixin, Wei Honggang, Lei Yuxue, Dong Xuejie. Geological conditions and exploration potential of shale gas of Upper Triassic Baiguowan Formation in Mishi Sag, Xichang Basin[J]. China Petroleum Exploration, 2021, 26(5): 100-112.

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