三维地层压力预测方法及应用研究

针对目前地层压力预测中不能建立比较精确的地层压力场的问题．利用测井声波进行约束建立空间的三维地震层速度体，通过建立正常泥岩压实趋势方程．求取正常趋势速度体，又利用比值法并结合实际研究区域建立了计算压力系数的乘幂回归方程．回归方程的参数通过实际工区17口井的数据回归得到．进而建立了一种新的三维地层压力预测方法，将该方法应用于济阳坳陷中东营凹陷胜坨区块．通过实测压力系数与预测压力系数的对比分析、不同层位的压力系数平面分布分析、纵向地层压力系数及空间的压力系数分布分析．证明了所提出的三维地层压力预测方法的合理性与有效性．同时也证明了该方法可提高地层压力预测的精度。

Technology and Applications of 3D Formation Pressure Prediction

At present, it is still difficult to establish an accurate formation pressure prediction. Regarding such scenario, a new method of 3D formation pressure prediction was introduced in this paper. Firstly, normal trend velocity volume is gotten by making use of normal shale compaction trend formula. Secondly, seismic velocity volume is gotten by taking advantage of well logging constrain inversion. Finally, power regression formula is gotten by employing ratio method and actual researched region. In addition, coefficient of regression formula is calculated through seventeen wells logging data of project. This method has been applied in Sheng-tuo of Dongying sag of Jiyang depression. It was approved that 3D pressure prediction is reasonable and effective in terms of analysis and comparison between actual and predicted pressure coefficient, lateral distribution of pressure coefficient in different horizons, distribution of vertical formation pressure coefficient and spatial pressure coefficient. Some new understandings of formation pressure was achieved by use of 3D pressure prediction, at the same time, accuracy of formation pressure prediction was improved.