塔里木盆地喀什凹陷含油气评价

塔里木盆地喀什凹陷受南天山造山带和西昆仑造山带的影响,具有独特的对冲地质结构,时间上,表现为不同演化阶段构造格局与沉积环境的差异;空间上,表现为不同类型的原型盆地与构造层序的叠置。圈闭主要形成于喜马拉雅运动期。凹陷内主要有2套生油岩:侏罗系及石炭系-下二叠统生油岩,目前正处于生油高峰的侏罗系生油岩厚度大,分布范围广,为主力生油岩。凹陷内主要发育2套优质储盖组合:下第三系-白垩系储盖组合及上第三系中新统内部储盖组合。综合评价认为喀什凹陷具备形成规模油气田的物质基础,是寻找油气的有利区域。

Hydrocarbon Evaluation of Kashi Sag in Tarim Basin

With the influences of southern Tianshan and western Kunlun orogenic belts,Kashi sag in Tarim basin has special wedge geologic structure style. On time aspect,it shows the diversity of structural framework and sedimentary environment in different evolution period. On space aspect,it shows overlapping of prototype basin and structural sequence of different types. Traps here were mostly formed in the Himalayan movement period. There are two sets of source rocks in the sag: Jurassic and Carboniferous,Lower Permian source rocks. With larger thickness and wide distributed area,the Jurassic source rock that is at the peak of hydrocarbon generation is major source rock. In this sag,two sets of fine reservoir,cap assemblages are developed: one is Lower Tertiary,Cretaceous and the other is Miocene of Upper Tertiary. The comprehensive evaluation suggests that Kashi sag is of material conditions for forming large,scale oil,gas fields and will be a favorable area for hydrocarbon prospecting.