波阻抗模型正演技术在砂岩储层预测中的应用

Using forward impedance modeling to trace the sandstone reservoir

（中国石化西南分公司物探研究院, 四川德阳 618000）

（The Geophysical Prospecting Research Institute, Southwest Branch, SINOPEC. No. 398, Taishan Nanlu, Deyang 618000）

介绍了利用P波阻抗模型正演技术进行浅层砂体追踪的实用方法技术。这些方法技术具有如下特点：①根据已知井的岩性特征和声波、密度测井资料等参数制作砂体模型; ②利用P波阻抗模型正演方法计算砂体模型的地震记录; ③根据P波阻抗模型正演方法计算出的地震响应特征(低频、强振幅)来追踪砂体。在川西地区，利用P波阻抗模型正演技术进行浅层砂体追踪，获得了很好的效果。

The forward P-wave impedance modeling technology has been succeeded in tracing sandstone in the shallow stratum for seismic prospecting in West Sichuan. In this paper, some methods and technologies about how to use the P-wave impedance forward modeling technology to trace sandstone in West Sichuan will be described. The characters of this modeling technology are: ①using the known log parameters such as the lithology character, the ac and the density to form the sandstone model; ②using the forward modeling technology for P-wave impedance to compute the seismic data for the sandstone; ③ according to seismic response character (low frequency，strong amplitude) of computed seismic data, tracing sandstone reservoir.