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通过对岩石学特征、岩石颜色、沉积构造、生物化石标志、粒度特征、单井相分析、地球化学及古生物特征研究证明姬塬油田长6_1油层组属于三角洲前缘亚相沉积,水下分流河道和水下支流间湾是主要沉积微相,与水下分流河道伴生的有水下天然堤、水下决口扇和水下河口坝沉积微相。研究区长6_1油层组以受北西方向主要物源区和北东方向次要物源区的控制,平面上发育四条规模较大的呈北西一南东向展布的水下分流河道砂体,与其伴生的有水下天然堤、河口坝砂体,水下分流河道之间发育支流间湾沉积。
Through the study of petrology characteristics, rock color, sedimentary structure, fossil sign, grain size, single-well facies analysis, geochemistry and paleontology, it is proved that the Chang 6-1 reservoir in the Jiyuan oil field belongs to the delta front sedimentary subfacies, the submarine distributary channel And the sub-tributary Bay are the major sedimentary microfacies. Associated with the underwater distributary channel, there are underwater natural dike, underwater mouth fan and underwater mouth bar sedimentary microfacies. Under the control of the main source region in the northwestern direction and the secondary source region in the northeast direction, the study area 6_1 oil layer has developed four large-scale submarine distributary channel sandbodies spreading from northwest to south and east in the plane, Associated with it are the submarine natural dike, mouth bar sand body, underwater distributary channel between the development of tributary bay deposits.