地震资料反演砂岩孔隙度方法

Sandstone porosity inversion based on seismic data

(1.长安大学地球科学与国土资源学院，陕西西安710054；2.中国石油化工股份有限公司中原油田分公司勘探开发科学研究院，河南濮阳457001；3.中国石油化工股份有限公司中原油田分公司物探研究院，河南濮阳457001)

College of Earth Science and Land Resources, Chang’an University, Xi’an 710054, China

探讨了利用地震资料反演砂岩孔隙度的方法。方法的基本原理是：首先利用地震、测井等资料，在精确层位标定的基础上，进行波阻抗反演，得到砂层组的波阻抗；然后对砂层组的波阻抗进行校正，去除泥岩的影响；最后利用校正后的波阻抗(砂岩波阻抗)计算孔隙度。将该方法应用于东濮凹陷，预测的孔隙度及其平面分布特征与井资料基本相符。

The inversion of sandstone porosity based on seismic data is discussed. The basic principles are that 1) seismic data and logging data are used to inverse the wave impedance of sand set, 2) the wave impedance of the sand set is corrected to remove the effect of mudstone, and 3) the wave impedance after correction (the wave impedance of sandstone) is used to calculate the porosity. The method was applied to Dongpu depression, showing that the predicted porosity and its distribution feature on plane is in good accord with the logging data.