水驱砂岩油藏孔喉结构变化的三维网络模拟

以长期水驱实验为基础，建立了等效水驱砂岩储层孔喉结构变化的三维网络模拟模型，结合三维微粒运移机制和有限差分求解方法，得到了长期水驱砂岩油藏孔喉结构变化规律：（1） 冲刷后喉道半径呈增加趋势，喉道半径变化范围变大，极小喉道半径呈微弱减小趋势；（2） 孔隙网络模型中冲刷半径扩大的孔道分布形式与原始孔隙网络结构密切相关，并非所有的大孔道都串联起来贯穿岩芯孔隙网络的两个端面，但入口端和出口端部分大孔道相互连通，形成端面上的大孔道网络群。网络模拟注水结果结合采油井测试，可为注水剖面的调整提供更加可靠的依据。

3D NETWORK MODELING OF LONG TERM WATER FLOODED SAND RESERVOIR PORETHROAT STRUCTURE VARIATION

Based on water flooding test,3D network model of long term water flooded sand reservoir pore throat structure variation is constructed to analyze its variation law by using the 3D particle migration model and finite difference solution method.The result indicates that the throat radius and its variation range increase after long term water flooding behavior while radius of the minima throat decreases.The distribution pattern of channels which includes the original larger radius throats and the big pores after water flooding is determinated by the original rock structure.In fact,not all the channels are connected to each other all over the pore scale network and form a crossed channel,but several big radius pores in the start and end face of the pore scale network are connected to each other and formed a channel group.The modeling result together with oil well testing can provide more reasonable solution to the adjustment of injection profile.