新疆和什托洛盖盆地侏罗系油气成藏条件及资源潜力

Hydrocarbon Accumulation Conditions and Resource Potential of Jurassic in Heshituoluogai Basin,Xinjiang

据野外剖面调查、地震及分析化验等资料,结合低勘探程度盆地油气资源评价方法和关键参数,对和什托洛盖盆地侏罗系油气成藏条件和资源潜力进行研究。结果表明:盆地内侏罗系具有利生储盖组合特征;中—下侏罗统发育厚度较大的暗色泥岩和煤,有机质丰度高,现今处于低成熟—成熟阶段;侏罗系八道湾组、三工河组和西山窑组为优质储层,利于油气近距离运移;西山窑组顶部及白垩系吐谷鲁群底部泥岩,为侏罗系直接盖层。油气资源评价结果表明,盆地油气地质资源量分别为3324.93×10^4 t和16.13×10^8 m^3,证实该盆地具较大勘探潜力,白杨河凸起和南部斜坡带为有利勘探区带。

Based on the research on the assessment methods and key parameters of petroleum resource in low-exploration basins,this paper conducted a comprehensive assessment of petroleum resources in the Heshituoluogai Basin.The results show that the Jurassic has favorable source-reservoir-cap assemblage:the middle and lower Jurassic develops dark mudstone and coal with large thickness and high organic matter abundance,which is now in the stage of low maturity-maturity;J1b,J1s and J2x in the Jurassic are high-quality reservoirs,which are favorable for the close migration of petroleum;Mudstone which devloped in the top of J2x and the bottom of Tugulu group of Cretaceous can be used as the direct caprock of Jurassic.By adapting the geochemical methods,the conventional oil and gas resources in place are 3324.93×104t and 16.13×108m3 respectively,which proves that the basin has great exploration potential;The baiyanghe uplift and southern slope zone are selected as favorable exploration zones.