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研究区长6油层砂体主要为灰色细粒长石砂岩,根据测井资料单井相分析及前人研究,认为长6油层砂体主要为三角洲前缘的水下分流河道沉积。分别绘制了长61、长62、长63、长64层的沉积相平面图和沉积相剖面图,确定水下分流河道的位置。河道砂体在垂直物源方向,横向连通性较差,河道中部砂体厚度较大。而沿河道方向,河道砂体连通性好,厚度发育稳定。
According to single well facies analysis of well logs and previous studies, it is concluded that the Chang 6 reservoir is mainly subaqueous distributary channel deposition in the delta front. The sedimentary facies plan and sedimentary facies profile of Chang 61, Chang 62, Chang 63, and Chang 64 are respectively plotted to determine the location of underwater distributary channel. In the direction of vertical provenance, the channel sand body is poor in horizontal connectivity and the sand body in the middle part of the river channel is thick. Along the direction of the river, the river sand body has good connectivity and stable thickness development.