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Enlightenment of calcite veins in deep Ordovician Wufeng-Silurian Longmaxi shales fractures to migration and enrichment of shale gas in southern sichuan basin, SW China

引用

Petroleum Exploration and Development 2023年第6期50卷 1374-1385页

作者： CUI Yue LI Xizhe GUO Wei LIN Wei HU Yong HAN Lingling QIAN Chao ZHAO Jianming University of Chinese Academy of Sciences Beijing 100049China Research Center of sichuan basin PetroChina Research Institute of Petroleum Exploration&DevelopmentBeijing 100083China Petroleum Industry Press Co. Ltd.Beijing 100011China Research Institute of Digital Geology and Energy Linyi UniversityLinyi 276000China MOE Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development Northeast Petroleum UniversityDaqing 163318China Shale Gas Exploration and Development Department CNPC Chuanqing Drilling Engineering Co. Ltd.Chengdu 610051China 7.PetroChina Southwest Oil&Gas Field CompanyChengdu 610056China

The relationship between fracture calcite veins and shale gas enrichment in the deep Ordovician Wufeng formation-Silurian Longmaxi formation (Wufeng-Longmaxi) shales in southern sichuan basin was investigated through core and thin section observations, cathodoluminescence analysis, isotopic geochemistry analysis, fluid inclusion testing, and basin simulation. Tectonic fracture calcite veins mainly in the undulating part of the structure and non-tectonic fracture calcite veins are mainly formed in the gentle part of the structure. The latter, mainly induced by hydrocarbon generation, occurred at the stage of peak oil and gas generation, while the former turned up with the formation of Luzhou paleouplift during the Indosinian. Under the influence of hydrocarbon generation pressurization process, fractures were opened and closed frequently, and oil and gas episodic activities are recorded by veins. The formation pressure coefficient at the maximum paleodepth exceeds 2.0. The formation uplift stage after the Late Yanshanian is the key period for shale gas migration. Shale gas migrates along the bedding to the high part of the structure. The greater the structural fluctuation is, the more intense the shale gas migration activity is, and the loss is more. The gentler the formation is, the weaker the shale gas migration activity is, and the loss is less. The shale gas enrichment in the core of gentle anticlines and gentle synclines is relatively higher.

关键词： sichuan basin deep formation in southern sichuan basin Ordovician Wufeng formation Silurian Longmaxi formation fracture calcite vein fluid inclusion shale gas enrichment model

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