一种适用于欠压实成因的地层孔隙流体压力预测技术  

Pore pressure prediction method of undercompacted formation

作　　者：熊晓军[1] 黄劲 陈容 LIAO Yiduo 袁野 XIONG Xiaojun;HUANG Jin;CHEN Rong;LIAO Yiduo;YUAN Ye(State Key Lab of Oil and Gas Reservoir Geology and Exploitation(Chengdu University of Technology),Chengdu610059,China;Winchester Thurston School,Virginia22601,U.S.A.)

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,成都610059 [2]Winchester Thurston School

出　　处：《物探化探计算技术》2019年第1期1-5,共5页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家科技重大专项(2016ZX05060-006)

摘　　要：为了提高基于欠压实成因机制的地层孔隙流体压力预测的准确性,这里从提高地震层速度场的计算精度的角度出发,提出了一种高精度地层孔隙流体压力预测技术。①该技术针对浅部地层(无测井曲线的地层段)采用三维约束DIX反演方法和叠加速度体、层位数据计算浅部地层的地震层速度体;②针对中深层地层(有测井曲线的地层段)采用叠后波阻抗反演方法和叠后三维地震数据体、测井数据、层位数据计算中深层地层的地震层速度;③沿着研究区的某一浅部地层分界面将浅部地层与中深层地层的地震层速度体进行拼接处理,得到一个完整的地震层速度体;④采用"Fillippone方法+Eaton方法"的组合方法进行三维地层孔隙流体压力预测。某区页岩气地层的实际计算结果验证了该技术的正确性与可靠性,其预测的地层孔隙流体压力与实钻井一致,且目的层的地层孔隙压力平面分布特征与地质认识一致,有助于指导研究区后续的勘探与开发。In order to improve calculation precision of pore pressure prediction for uncompacted formation,this paper proposes a high precision pore pressure prediction method based on high precision seismic interval velocity.The first step of the method is to calculate seismic interval velocity of shallow layers by using 3D constrained DIX inversion method with stack velocity data and seismic horizon data,and the shallow layers have no logging data.The second step of the method is to calculate seismic interval velocity of middle-deep layers by using post-stack impedance inversion method with 3D seismic data,logging data and seismic horizon data.The third step is to splice the two different kinds of seismic interval velocity along a special shallow layer,and obtain a complete seismic interval velocity field.The fourth step is to calculate pore pressure by using a combined method of"Fillippone method+Eaton's method".The results show that the proposed method can obtain accurate values of pore pressure which is consistent with the measured values,and the calculated plane distribution characteristics of pore pressure is consistent with geological results.

关 键 词：孔隙流体压力 地震层速度 DIX 波阻抗反演 Eaton方法 

分 类 号：P631.4[天文地球—地质矿产勘探]