准噶尔盆地乌夏断裂带复式油气成藏特征

通过综合地质研究,认为准噶尔盆地乌夏断裂带为典型复式油气聚集带,油气主要来源于二叠系佳木河组、风城组和下乌尔禾组烃源岩,三次油气充注形成了三期油气藏;油气藏类型复杂多样,具有多种储盖组合;断裂、不整合面及连通性砂体构筑了油气运移的立体输导体系;烃源岩和生排烃中心、构造和沉积相带、断裂和不整合以及有利储层是乌夏断裂带油气分布的主控因素。乌夏断裂带复式油气成藏特征及油气分布主控因素的研究成果,对本区油气勘探及滚动评价工作具有重要的指导意义。

Hydrocarbon accumulation characteristics of complicated reservoirs in Wuxia fault belt of Junggar basin

Through comprehensive geological research, Wuxia fault belt is found to be a typical multiple oil and gas accumulation zone,the oil and gas mainly derived from source rocks of Permian Jiamu river formation,Fengcheng formation and lower Wuerhe formation.Through three hydrocarbon fillings,three periods of oil and gas reservoirs have been formed.The hydrocarbon reservoirs have characteristics of various reservoir types and mutiple reservoir-caprock assemblages.The faulting,unconformity surface and the connectivity of sand body built up the three-dimensional conducting system of oil and gas migration.The main controlling factors of oil and gas distribution of Wuxia fault belt are found to be as the follows,namely the source rocks,the hydrocarbon-generation and hydrocarbon-expulsion centers,structural and sedimentary facies belts,faulting,unconformity and favorable reservoirs.The hydrocarbon accumulation characteristics of complicated reservoirs in Wuxia fault belt of Junggar basin and main controlling factors of hydrocarbon distribution are of important guiding significance for the oil and gas exploration and the rolling exploration evaluation in the area.