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基于四川盆地东北部(川东北)地区区域构造演化和侏罗系油气地质条件研究,分析了研究区侏罗系油气地质特征与成藏主控因素。认为川东北地区经历了从内陆克拉通之后的大型淡水坳陷湖盆阶段向大巴山前陆盆地阶段的转换过程。同时,通过对川北前陆盆地生烃演化与油气运移特征,大巴山构造演化与圈闭发育特征,及其对油气成藏作用分析,剖析了川东北地区侏罗系自流井组大安寨段、凉高山组、沙溪庙组油藏成藏主控因素和富集规律,指出川东北地区侏罗系油藏为成岩后期油藏,即成岩压实作用之后烃源岩才大量生烃,聚集成藏,表现为储层成岩演化与生烃演化的不协调性,导致研究区含油气层系多、发育不规则、油气分布分散而又不均匀,且油气层只产油气、不产水。
Based on the study of regional tectonic evolution in the northeastern Sichuan Basin (northeastern Sichuan) and the geological conditions of Jurassic petroleum, the geological characteristics of the Jurassic petroleum in the study area and the main controlling factors of hydrocarbon accumulation are analyzed. It is concluded that the northeastern Sichuan experienced the transition from the large freshwater depression lacustrine basin stage to the Daba Mountains foreland basin stage after the inland craton. At the same time, by analyzing the characteristics of hydrocarbon evolution and hydrocarbon migration, the tectonic evolution and trapping characteristics of Dabashan and their hydrocarbon accumulation in the northern Sichuan Basin, the paper analyzes the Daanzhai section of the Jurassic Artesian well in the northeastern Sichuan Basin, It indicates that the Jurassic reservoirs in the northeastern Sichuan Basin were diagenetic reservoirs, that is, hydrocarbon generation and accumulation occurred only after the compaction of diagenetic rocks The reservoir formation is characterized by the incompatibility of reservoir diagenesis evolution and hydrocarbon generation and evolution. As a result, there are many oil-bearing gas reservoirs in the study area, with irregular development and uneven distribution of oil and gas distribution. Only oil and gas are produced in the oil and gas reservoir, and water is not produced.