陕北斜坡南部L地区延长组长6沉积相研究

Research on Sedimentary Facies of Chang 6 Reservoir in L Area in the South of Shanbei Slope

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。

In research area, reservoir sand of Chang 6 is mainly gray fine-grained feldspar sandstone. According to the analysis of single well logging data and the predecessors＇ research, it＇s pointed out that the Chang 6 reservoir sand bodies are mainly underwater distributary channel of delta front deposition. Sedimentary facies and sedimentary facies section of Chang 61, Chang 62, Chang 63, Chang 64 layers were respectively plotted to determine the position of the underwater distributary channel. In vertical provenance direction, lateral connectivity of channel sand body is poor; thickness of central channel sand body is big. And along the direction of river stream, the connectivity of channel sand body is good; the development of thickness is stable.