期刊
AAPG BULLETIN
卷 105, 期 12, 页码 2425-2447出版社
AMER ASSOC PETROLEUM GEOLOGIST
DOI: 10.1306/0702211610418010
关键词
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资金
- National Natural Science Foundation of China [41802153, 41728004]
- Key Project of National Science and Technology [2017ZX05035-002]
- Foundation of Key Laboratory of Tectonics and Petroleum Resources [TPR-2017-17]
- Science Foundation of the China University of Petroleum, Beijing [2462017YJRC024]
- Open Fund of the Sinopec Key Laboratory of Shale Oil/Gas Exploration and Production Technology
- China National Petroleum Corporation
- Shenhua Group Corporation
- Chongqing Institute of Geology and Mineral Resources
- Sinopec
The Longmaxi Formation shale has a unique gas accumulation mechanism due to its multiphase tectonic movements and burial characteristics. As shales are more strongly deformed tectonically, their sealing capabilities weaken, leading to the formation of disrupted shale gas reservoirs at the basin margins.
The Longmaxi Formation shale has a unique gas accumulation mechanism resulting from its multiphase tectonic movements and burial characteristics. This formation's structure, burial, and gas accumulation mechanisms were studied based on structural interpretations, geochemical characterization, core observations and descriptions, burial history study, and comparisons of production rate and gas content between shale gas wells located in different structural settings. This study indicates that as shales are more strongly deformed tectonically, their sealing capabilities weaken. From the center to the margins of the basin, the uplift occurred earlier, the burial depths became shallower, and the residual strata area became smaller. These key factors have led to the formation of disrupted shale gas reservoirs at the basin margins with the quality of shale gas reservoirs degrading compared to those of the interior of the basin. Based on the migrated gas source from the basin interior and reservoir sealing capacity, three gas accumulation models are proposed: available migrated gas source + sealed reservoir, available migrated gas source + open reservoir, and unavailable migrated gas source + open reservoir. The most favorable model is the available migrated gas + sealed reservoir model because it has the presence of additional migrated gas source
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