复杂地层地层孔隙压力求取新技术

在分析异常高压形成机理及国外地层压力求取方法研究进展的基础上，介绍了适于泥岩欠压实成因及适于砂泥岩地层不同成因的地层孔隙压力求取新方法，其理论基础是有效应力定理，通过建立声波速度和垂直有效应力等因素的关系模型，利用测井等资料求取地层的垂直有效应力，从而求取地层孔隙压力。其中，利用适于砂泥岩地层不同成因的孔隙压力求取方法，可以获得真正连续的孔隙压力剖面。根据国内外地层压力计算最新方法，编制了地层压力分析应用软件，多年来在国内多个油田的应用表明，该软件具有先进性和很好的实用性。

New Methods for Calculation of Pore Pressure in Complex Geologic Environment

On the basis of analyzing the common generating mechanisms of abnormal high pore pressure and the new progress in pore pressure determination methods in the world, this paper presents two new pore pressure calculation methods suitable for undercompaction and various sand-shales respectively. According to the effective stress principle, the two methods calculate effective vertical stress using logging data by establishing relation between sonic velocity and the effective vertical stress. One method suitable for sand-shales can develop a continuous pore pressure profile. A formation pressure analysis and application software made based on the newest formation pressure calculation methods used worldwide has been applied in many oilfields and proved to be advanced and practical.