综合成岩作用和孔隙形状的岩石物理模型及其应用

横波速度对于地震模拟、AVO分析以及流体识别具有重要意义,实际测井数据中横波速度信息缺乏,因此横波速度预测已经成为岩石物理研究的一个焦点。综合Xu-White模型以及Pride模型,提出了一种新的用于计算干岩石模量的岩石物理模型。该模型综合考虑了孔隙形状和成岩作用对干岩石体积模量、剪切模量的影响,因此该模型更加合理并具有更高的精度。同时联合Gassmann理论,建立了饱和流体岩石的纵波、横波速度计算模型。将该模型成功地应用于实验室测量数据和实际测井数据的横波速度预测中,预测结果表明,基于本文提出的岩石物理模型的横波速度预测方法是行之有效的。

A new rock physics model integrating diagenesis and pore shape and its application

Shear wave velocity plays an important role in seismic modeling,AVO analysis and fluid identification.However,realistic well logging data lack shear wave information,so shear wave velocity prediction becomes concentrated on rock physics research.Integrating K-T model and Pride model,the authors propose in this papera new rock physics model which is used to calculate dry rock moduli.The new rock physics model proposed in this paper integrates effects of pore shape and diagenesis to bulk modulus and shear modulus of dry rock,so it is more rational and its accuracy is high.At the same time,in combination with Gassmann theory,P-wave velocity and S-wave velocity model of fluid saturated rock is established.The model is applied to S-wave velocity predicting of measured data in lab and realistic well logging data.The predicted results demonstrate that S-wave velocity prediction based on the new rock physics model proposed in this paper is effective.