准噶尔盆地隐蔽油气藏类型及有利勘探区带

针对准噶尔盆地隐蔽油气藏勘探潜力巨大但成藏规律非常复杂的情况,在回顾其隐蔽油气藏勘探历程基础上,把已发现的隐蔽油气藏划分为岩性类、地层类、复合类和(准)连续型4大类及17个亚类。其成藏特点为:多沉积体系控制;多圈闭类型展布、构造—岩性—地层复合;多层系含油气;多期充注、多期成藏;多成藏组合型式。隐蔽油气藏有利勘探区带为盆地西缘车排子斜坡带沙湾组成藏组合、车—莫古隆起周缘侏罗系成藏组合、准噶尔盆地石炭系成藏组合和北天山山前坳陷深层致密砂岩侏罗系成藏组合。

Subtle reservoir type and favorable exploration belts in Junggar Basin

According to the great potential and complicated accumulation rules of subtle reservoirs in the Junggar Basin, we divided the discovered subtle reservoirs in the study area into 4 types (lithologic, stratigraphic, complex and quasi-continuous ones) and 17 subtypes based on previous exploration experiences. The accumulation characteristics were concluded as followed: the control of multiple sedimentary systems; the occurrence of multiple trap types and the combination of structural-lithologic-stratigraphic traps; multiple hydrocarbon bearing layers; multiple stages of hydrocarbon charging and accumulation; multiple oil and gas plays. The favorable exploration belts of subtle reservoirs include the Shawan Formation in the Chepaizi slope in the western margin of the basin, the Jurassic around the Che-Mo paleo-uplift, the Carboniferous in the Junggar Basin, and the Jurassic tight sandstones in the piedmont depression of the North Tianshan.