准噶尔盆地中4区块D1井区油气来源与成藏模式

Oil - gas source and reservoir - forming model in Dong 1 well area,Zhong 4 block, Junggar Basin

准噶尔盆地中4区块D1井在侏罗系头屯河组测试出较高产量的工业油气流,证明盆地中部油气资源富集。将该井油气地球化学特征与邻井烃源岩进行对比分析发现,其原油主要来自中下侏罗统烃源岩,天然气为侏罗系与二叠系混源成因。D1井区具有良好的油气成藏条件,其中二叠系和侏罗系烃源岩为该区提供丰富的油气,在异常高压作用下分别沿层间断层和不整合面向侏罗系头屯河组、西山窑组岩性圈闭运移并聚集成藏。

Commercial oil and gas flow with high production had been tested in Dong 1 well of Zhong 4 block at Toutunhe formation of Jurassic in Junggar Basin. It proved that the center area in the basin was abundant in oil and gas. Contrasting geochemical characteristics of oil and gas collected from the well with that of near wells and source rocks, a conclusion could be drawn that the crude oil in the well mainly came from middle - lower Jurassic source rocks while the natural gas was the mixing source origin of Jurassic and Permian. Oil - gas reservoir - forming conditions were good in Dong 1 well block. Permian and Jurassic source rocks provided a great deal of oil and gas, and the oil and gas migrated and accumulated for reservoir forming from interlayer faults and unconformity surfaces respectively to lithologic traps of Toutunhe formation and Xishanyao formation of Jurassic under abnormally high pressure.