西昌盆地米市凹陷上三叠统白果湾组页岩气地质条件及勘探潜力

doi:10.3969/j.issn.1672-7703.2021.05.009

摘要/Abstract

摘要： 上三叠统白果湾组是西昌盆地米市凹陷重要的页岩层系，为探索其页岩气地质条件及勘探开发潜力，通过地质调查、系统取心、岩心观察、实验分析测试等方法，重点对白果湾组富有机质泥页岩的分布特征、地球化学特征、储层特征、含气特征及保存条件等进行研究，并与国内已获得良好陆相页岩气发现的页岩层系展开对比分析。研究结果表明：（1）米市凹陷白果湾组富有机质泥页岩较发育，厚度较大、有机碳含量适中、热演化程度适中、脆性矿物含量较高、孔隙度较高、含气性较好，具备页岩气形成的有利地质条件；（2）较之于国内其他已获得良好发现的陆相泥页岩，米市凹陷白果湾组泥页岩的孔隙度、有机碳含量、有机质成熟度、含气量等关键参数基本相当；（3）在综合考虑富有机质泥页岩发育程度、埋深、保存和开发等条件下，认为特尔果、七里坝、乐伍、四开、西昌北5个区块是米市凹陷白果湾组页岩气勘探的有利地区，勘探开发潜力较大。

关键词: 米市凹陷, 白果湾组, 页岩气, 地质条件, 勘探潜力

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.

中图分类号:

TE122.1

何伟, 陈杨, 方坤, 刘治成, 牟必鑫, 魏洪刚, 雷玉雪, 董雪洁. 西昌盆地米市凹陷上三叠统白果湾组页岩气地质条件及勘探潜力[J]. 中国石油勘探, 2021, 26(5): 100-112.

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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