利用声速检测欠压实泥岩异常高压的简易方法与应用

A Simple Pore Pressure Estimation Method for A Disequilibrium Compaction Shale Using Sonic Velocity

提出了一种利用声波速度检测欠压实泥岩地层异常高压的简易方法。利用泥岩地层的声波传播速度与垂直有效应力间良好的相关关系 ,建立速度模型 ,由速度模型求取垂直有效应力 ,进而利用有效应力定量求取地层孔隙压力。该方法能更好地反映沉积物的压实规律 ,能在较宽的垂直有效应力范围内合理地描述声波速度与垂直有效应力的关系 ,且不需要建立正常压实趋势线。不同地区的应用结果表明 ,该方法有较好的适应性和较高的检测精度 ,尤其对于新生代沉积地层更是如此。

In this paper, a new pore pressure estimation method for a disequilibrium compaction shale is proposed. This method uses sonic velocity and effective stress principle to calculate pore pressure. The vertical effective stress is obtained with the model. This method needn't any normal trend and is better than the traditional ones. Its applications in various regions show high accuracy, especially for Cenozoic sedimentary formations.