This article was based on the Chang 8 oil geology characteristics of Yanchang in Late Triassic which belongs to the Zhiluo oilfield. It comprehensively evaluated the sedimentary features, the sedimentary cycle characteristics, provenance analysis and reservoir characters. Then, it drew the conclusions as follows ： Chang 8 in Zhiluo oilfield belonged to delta depositional system, mainly developed delta front sub -facies. And underwater distributary channel was the most favorable micro -facies. Chang 8 reservoir of Yanchang formation was divided into two oil sub-groups： Chang 81 and Chang 82. The source of the research area was from northeast. The lithology of the reservoir was mainly fine grain of arcose. The pore structure was mainly intergranular pore, secondly was dissolved pore.%对直罗油田三叠系延长组长8石油地质特征进行研究，通过其沉积特征、旋回特征、物源分析及储层特征综合评价得出，该区直罗油田长8期为湖泊三角洲沉积体系，主要发育三角洲前缘亚相，水下分流河道为最有利的沉积微相。依据沉积旋回特征和它的标志层，将长8层细分为长8^1和长8^2两个小层，且研究区物源来自于北东方向。储层岩性以细粒长石砂岩为主。长8储层．孔隙类型以粒间孔为主，溶孔次之。
展开▼
