波阻抗剖面在砂层解释中的应用

The application of wave impedance section to the sand body interpretation

胜利石油管理局物探研究所,东营 257100

Research Institute of Geophysical Exploration. Shengli Petroleum Administration, Dongying 257100

本文通过正演模型,详细地分析了相对波阻抗剖面的优点,与常规地震剖面相比,在波阻抗剖面上追踪到的同相轴往往反映了砂层而不是反射系数,且其相位宽度具有厚度的概念。将波阻抗剖面应用到樊家地区的砂体解释中,取得了良好的效果,能很好地识别砂层,准确地判断其展布方向,与钻井试油结果完全吻合。此外,波阻抗剖面还能较好地预测砂层孔隙度的横向变化趋势。

In accordance with thc forward model, we analyze the advantage of the relative wave impedance section in detail. Compared to the conventional seismic section,the events traced in the wave impedance section frequently reflect thc sand body rather than the reflection coefficient,and the phase width has the concept of depth. A good cffect has been achicved when applying the wave impedance section to the sand body interpretation of the Fan jia area. It can well recognize the sand body and accurately judge its spread direction,which coincides with the result of drilling and oil testing. Morcover,the wave impedance section can be used to predict the lateral variation trcnd of the sand body porosity.