基于测井资料的孔隙压力预测方法研究——以鄂尔多斯盆地A探区为例

Pore pressure prediction of logging data:a case study of A area in Ordos Basin

在勘探开发过程中,压力资料有助于确定储层的驱动力和连通性。在套管设计过程中,地层压力的预测是非常重要的。孔隙压力受孔隙度、流体类型、储层连通性和储层致密性的影响。因此,孔隙压力剖面对储层评价和钻井具有重要意义。一般情况下,孔隙压力的预测是根据考虑应力的纵波速度方程,然而这些方程的共同缺陷是预测结果受正常压实趋势速度的影响。当浅层速度测井资料不完整或不准确时,很难准确计算正常压实趋势速度。针对这一问题,利用一种新的孔隙压力预测方法,通过预测压力与实测压力的比较,证明新方法能准确地预测孔隙压力。

In the process of exploration and development,pressure data is helpful to determine the driving force and connectivity of reservoir.In the process of casing design,the prediction of formation pressure is very important.Pore pressure is affected by porosity,fluid type,reservoir connectivity and reservoir compactness.Therefore,pore pressure profile is of great significance for reservoir evaluation and drilling.Generally,the prediction of pore pressure is based on P-wave velocity equation considering stress.However,the common defect of these equations is that the prediction result is affected by normal compaction trend velocity.When the shallow velocity logging data are incomplete or inaccurate,it is difficult to accurately calculate the normal compaction trend velocity.In order to solve this problem,a new pore pressure prediction method is used.By comparing the predicted pressure with the measured pressure,it is proved that the new method can accurately predict the pore pressure.