用核磁共振及岩石物理实验求地层束缚水饱和度及平均孔隙半径

An Approach to Calculate Bound Water Saturation and Average Pore Radius with NMR Logs and Petrophysical Experiments.

地层孔隙半径通常是由实验室测定 ,常常只能得到不连续的点 ,无法像其它测井曲线那样连续地测量和显示。利用核磁测井资料结合岩心压汞分析资料来综合求取地层束缚水膜厚度、平均孔隙半径 ,建立孔隙半径与孔隙度之间的关系模型。这样 ,就可以根据常规测井资料解释出的束缚水饱和度和孔隙度来计算地层孔隙半径。

The pore radius is one of the most important reservoir rock properties. Usually, it can be obtained only from few discrete points in laboratory measurements. In this paper, a new approach of combining Nuclear Magnet Resonance (NMR) logs with core experiment analysis is developed to build correlation between porosity and average pore radius, hence relations among bound water saturation ( S wb ), porosity, average pore radius and ratio of volume to surface area. Finally, continuous profiles of average pore radius and S wb from conventional well logs are built up. Some field examples demonstrate the validity of the method.