泌阳凹陷双河油田扇三角洲前缘构型精细解剖

Detailed reservoir architecture of fan-delta front in Shuanghe Oilfield,Biyang Depression

利用岩心、测井和生产动态资料,在扇三角洲前缘内部构型级次划分及识别单一河道砂的基础上,精细解剖泌阳凹陷双河油田Ⅶ10小层扇三角洲前缘的构型。双河油田扇三角洲前缘复合砂体主要发育水下分流河道、河口坝和溢岸砂3类构成单元,单一砂体构型界面为泥粉砂质夹层、钙质砂砾岩夹层以及泥砾岩夹层。研究区砂体的拼接样式分为河口坝-河口坝拼接、河口坝-辫状水道拼接、辫状水道-辫状水道拼接以及辫状水道-溢岸砂拼接等4种类型。应用三维视窗内多视角栅状组合技术在小层内识别出3条单一河道及其相应河口坝和溢岸砂,单一河道宽度为100-150m,具有从北向南逐步交叉合并并分流的变化规律。油田现有的井网不能有效地控制单一河道砂体分布,需要缩小井距,沿单一河道完善注采系统,以提高注水开发效果。

Based on the data of cores, well logging and dynamic production, architecture hierarchies re-division of fan-delta front,and single fluvial sand body identification, the reservoir architecture of fan-delta front of VII10 layer in Shuanghe Oilfield, Biyang Sag, is finely dissected. Underwater distributary channels, mouth bars, and overbank sands developed in the composite sand bodies of fan-delta front in Shuanghe Oilfield. And architecture boundaries of a single sand body are clay silty intercalations, calcium glutenite intercalations and muddy gravel intercalations. Stitching styles of single sand bodies present four types, i.e., a mouth bar stitching a mouth bar, a mouth bar stitching a braided channel, a braided channel stitching a braided channel, and a braided channel stitching an overbank sand body. Three single sand bodies and their corresponding mouth bars and overbank sands are identified in VII10 layer on the basis of multi-view palisade combination technology in 3D window. The single sand bodies, with width of 100-150 meters, gradually merge and distribute from north to south. Since the existing well pattern cannot effectively control the distribution of a single channel sand body, it is necessary to reduce the well space and improve injection-production systems along a single channel to enhance the water flooding development effect.