鄂尔多斯盆地泾河油田长8_1油层沉积相研究

Study on the Sedimentary Facies of Chang 8_1 Oil Reservoir in Jinghe Oilfield,Ordos Basin

泾河油田位于鄂尔多斯盆地西南部,其主力油层为三叠系延长组长8_1油层。以岩心资料为主,结合测井资料,综合分析了储层岩性、沉积构造、粒度分布及测井曲线相等特征,认为长8_1期为一套河控辫状河三角洲前缘沉积。主要发育辫状分流河道和河口砂坝、前缘席状砂沉积。

Jinghe oilfield is located in the southwest of Ordos Basin. Its main oil-bearing formation is Chang 81 reservoir of Triassic Yanchang Formation. The lithological characteristics, sedimentary structure and grain-size distribution of the reservoir were analyzed based on core data and logging data. The results show that river dominated delta system develops in Chang 81 oil-bearing bed. The main microfacies include submerged distributary channel, mouth bars and sheet sand.