东营凹陷南坡东段骨架砂体发育特征与油气显示的关系

Relationship between sand body framework development and oil-gas signs,east part of southern slope,Dongying sag

通过重点解剖东营凹陷南坡东段沙三段中、上亚段三角洲骨架砂体及沙二段河流相骨架砂体各静态地质要素发育特征,认为东营南坡东段骨架砂体具有厚度大、顶面形态及产状较平缓、物性好的特点。与油气显示特征相结合,发现砂体厚度、顶面形态与油气显示关系不明显;而砂体产状、物性与油气显示关系较好,砂体的产状和油气运移动力之一的浮力有关,而物性则与油气运移的毛细管阻力有关。倾角越大、物性越好,油气显示越丰富。因此确定产状、物性是影响砂体输导性能的主控因素,产状和物性的耦合控制了油气的优势运移路径。

Through the study on the development characteristics of static geologic factors of the sand body framework of mid-Es3,upper-Es3 delta and Es2 fluvial facies in the east part of the southern slope in Dongying sag.it is demonstrated that the sand body framework is high in thickness and smooth in topography and low in occurrence,as well as good in physical property.Combined with the hy-drocarbon signs and features,it is shown that the sand thickness and lop topography are not closely related with the oil-gas signs,but the sandstone occurrence and physical property are well related with the oil-gas signs.otherwise.the sandstone occurrence is related to the huoyance force,one of oil-gas migration driving force.The higher of the dip and better of the physical property,the favorable of the hydrocarbon signs will be.Hence,occurrence and physical property are main-controlling factors affecting sand stone migration ability,and coupling of occurrence and physical property control the preferential migration paths.