鄂尔多斯盆地Y66井区延9油层组砂体连通性评价

鄂尔多斯盆地Y66井区延9油层组属于低孔-低渗储层,注水见效差异显著.为实现该油层组高效开发,利用静态和动态连通性组合分析方法系统评价延9油层组的砂体连通性.基于单砂体叠置类型确定砂体静态连通性,并引入连通厚度与连通系数对砂体连通性进行定量表征.依据开发过程中产能变化和注水响应定量描述井间砂体的动态连通性.综合钻井岩心...

Sandbody connectivity evaluation of Yan 9 oil-bearing formation in Y66 area, Ordos Basin

Yan 9 oil layer group in the Y66 area of the Ordos Basin belongs to low porosity and low permeability reservoirs, and the effect of water injection is significant. In order to realize the efficient development of the oil layer group, a combination analysis method of static and dynamic connectivity is used to systematically evaluate the sand body connectivity of the Yan 9 oil layer group. The static connectivity of the sandbody is determined based on the superimposed type of the single sandbody, and the connectivity thickness and the connectivity coefficient are introduced to quantitatively characterize the connectivity of the sandbody. Quantitatively describe the dynamic connectivity of sand bodies between wells based on the productivity changes and water injection response during the development process. Comprehensive drilling cores and analysis of test data show that the sand bodies in the middle of the Yan 9 oil layer group in the Y66 well block have good connectivity, while the sand bodies in the southwest and northeast are relatively poorly connected; From the point of view of each layer, the sand bodies of Yan 9¹₁ and Yan 9²₁ have good vertical and lateral overlap relationships. The connected thickness is mostly within 6-10m, and the connected coefficient is mostly above 80%. The dynamic and static data are combined to distinguish the connection relationship of the oil layer group, which provides a theoretical basis for the next step of production and development.