基于数字岩心的致密砂岩储层流体赋存空间定量计算

在对FIBSEM图像进行数字岩心重构的基础上，分别探讨了岩心的静态属性和动态属性。静态属性主要考虑了孔隙度、连通孔隙度、有效孔隙度、均质性和孔隙结构等表征几何特征和拓扑结构的参数；动态属性考虑了可动流体空间和束缚水、残余油等渗流属性。研究表明:鄂尔多斯盆地延长组致密砂岩的岩石矿物组分呈现板结状，矿物颗粒难以区分，岩心内的孔隙形状复杂多变，分布均呈现一定的非均质性。根据是否连通及是否参加流动等标准对样品内的孔隙进行了划分及定量计算，结果表明，孔隙结构越复杂、小孔隙占比越高，则残余油体积越高，难动用储量越大，采收率越低。

Quantitative Calculation of Fluid Occurrence Space of Tight Sandstone Cores Reservoir Based on Digital Core Model

In this paper，the static and dynamic properties of the core were investigated on the basis of the FIBSEM image digital-core-reconstruction. Static attributes including porosity，connected porosity，effective porosity，heterogeneity and pore structure，etc.，and the dynamic properties including the fluid space and bound water，residual oil，etc. were considered. This research shows that the rock mineral components of tight sandstone in Yanchang Formation appear to be consolidated together，with mineral particles difficult to distinguish. The pore shape is complicated and the distribution shows some heterogeneity. The porosity through calculation of digital core is slightly larger than that experimented by gas. According to the standards of the connection and the participation in the flow，the pores are divided and quantitatively calculated respectively. The results show that the more complex the pore structure，and the higher the ratio of small pores，the higher the residual oil volume，the more difficult to recover the reserve，and the lower the recovery rate.