二维地层孔隙压力预测方法及应用

由于地震层速度是地层压力预测的重要参数，其精度直接影响着压力预测的精度，利用测井约束下的波阻抗反演方法将测井、地震和地质解释成果结合获取较高精度的地震层速度，达到提高地层压力预测精度的目的。详细介绍了制作地震合成记录、建立初始地质模型、采用Strata反演软件进行反演计算、时深转换求得速度剖面的步骤，和利用地层压力检测预测应用软件读取速度剖面中每一道的速度，结合单点压力预测模型，求得对应的地层孔隙压力的方法。应用实例表明，地球物理反演方法和二维压力预测模型的结合是可行的，所求得的地层压力剖面可以指导钻井设计。

A Method and the Application of Two Dimensional Formation Pressure Prediction

Seismic formation velocity is one of important parameters for formation pressure prediction, its precision affect the accuracy of the pressure prediction defectively. Using the wave impedance inversion method conditioned to well logging, the well logging data, seismic data and geologic interpretation were incorporated to obtain the better precision seismic formation velocity for the purpose of improving the precision of formation pressure prediction. This paper introduced how to make synthetic seismogram, how to built initial geological model, how to inverse using the software of STRATA and the procedures of obtaining the velocity profile through time and depth conversion. The formation pressure detection-prediction software was used to read velocity in the velocity profile, and the corresponding formation pressure was calculated combined with the single point pressure prediction model. The application results indicate that the combination of the geophysical inversion method and the formation pressure prediction model is feasible and the obtained formation pressure profile can guide the drilling design.