基于相变的井网水驱控制程度分析——以萨尔图中区西部二、三类油层为例

根据萨尔图中区西部的高密度测井资料,利用沉积单元单砂体精细解剖结果,开展了基于井网的砂体相变程度和控制程度分析,得出了注采井距对不同类型河道砂体相变率和控制率的影响规律。在此基础上,为充分考虑砂体平面非均质性的影响,进行了基于相变的水驱控制程度分析与评价。研究结果表明:利用传统方法统计得出的水驱控制程度值往往偏高;随着井网的加密,不同类型河道砂体的水驱控制程度变化幅度有所不同;进行沉积单元细分后,基于相变的水驱控制程度值降低,并更接近油藏实际。

Analysis on water flooding control degree based on phase transition： Taking Type Ⅱ and Type Ⅲ oil layers on the west section of central Saertu Oilfield as an example

According to high density logging data of the west section of central Saertu Oilfield, the analysis about phase transition and control degree are carried out based on well pattern with the detailed anatomy results of single sand body in sedimentary units. The influencing laws of injection-production well spacing on phase transition and control rate are obtained. On these bases, the analysis and evaluation on water flooding control degree are carried out based on phase transition in order to fully consider the effect of sand body plane heterogeneity. The research results show that the value of water flooding control degree drew from traditional statistical methods is often on the high side. Along with the well pattern infilling, the variation scopes of water flooding control degree are different between different types of channel sand body. The value of water flooding control degree based on phase transition would be smaller and be closer to the actual reservoir situation after subdivision of sedimentary unit.