Fillippone公式结合等效介质理论预测地层压力

Formation pore pressure prediction using Fillipone formula combined withequivalent medium theory

基于Fillipone公式的地震地层压力预测方法因其具有算法简单且不依赖于钻井数据和正常压实趋势线等诸多优点而被广泛应用于钻前压力预测。针对Fillipone公式中岩石速度上限和下限的确定存在经验性或区域局限性等问题,利用等效介质理论弹性模量边界算法,借助Voigt模型和Reuss模型、基于钻孔资料计算岩石速度上限和下限,进一步结合井地联合反演所获得的高精度层速度、密度,可以实现高精度地层压力预测,有效解决了岩性复杂区的压力预测问题,并在实际生产应用中取得了较好的效果。

The formation pressure prediction based on Fillipone formula is widely used before drilling because of its advantages such as simple algorithm,its independence on drilling data,and normal compaction trend.However rock high-and low-velocity limits in Fillipone formula are empirical or limited.To solve this problem,rock high-and low-velocity limits are calculated based on drilling data with Voigt model and Reuss model.Then accurate velocity and density are obtained with a joint logging and seismic inversion,and the high-precision formation pore pressure prediction can be achieved in complex-lithology areas effectively.The proposed approach achieves good results in the applications.