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《Geoscience》 2018-05
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Evolution Model for the Gas Reservoirs in the Shaximiao Formation,Eastern Slope of the Western Sichuan Depression

XU Min;LIU Jian;LIN Xiaoyun;XIONG Shan;NIU Binli;Hubei Collaborative Innovation Center for Unconventional Oil/Gas,Yangtze University;Key Laboratory of Exploration Technologies for Oil and Gas Resources of the Ministry of Education,Yangtze University;College of Geosciences,Yangtze University;The First Exploitation Factory of Oil Production,Changqing Oilfield Company of CNPC;  
The Shaximiao Formation is the main gas-producing sequence in the eastern slope of the Western Sichuan Depression,and its trap type is dominantly tectonic-lithologic trap. Most of the gas reservoirs are composed of tight sandstones with well-developed faults and fractures,which effectively improved the physical properties of reservoirs. The coupling patterns of fault and sandstone and their tectonic evolution are of great importance to the hydrocarbon accumulation. Our analyses on the dynamic evolution,gas-water distribution characteristics and hydrocarbon formation sequence of the gas reservoirs in the Shaximiao Formation( and the integration with regional tectonic evolution and hydrocarbon accumulation periods) concluded that gas accumulation in the Shaximiao Formation was influenced by tectonic uplifts,fault-sandstone configurations,physical properties of reservoir and tectonic evolution. This formed the reservoiring evolution patterns that are of tectonic orientation-controlled,fault-reservoir migrating-controlled,reservoir accumulation-controlled and evolution modification-controlled. The control of paleostructures in the Gaomiaozi region is more pronounced, while the Zhongjiang region is dominated by lithologic-control. Gas reservoirs in the Shaximiao Formation are featured by the three Yanshanian episodic reservoiring,and the subsequent Himalayan modification. The multi-phase tectonic evolution and strong reservoir heterogeneity have influenced the gas saturation,leading to the widely different gas distributions and reservoir productivity in the Shaximiao Formation.
【Fund】: 国家科技重大专项“海相碳酸盐岩油气资源潜力与大油气田形成条件、分布规律研究”(2011ZX05004-001)
【CateGory Index】: P618.13
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