宽带约束反演

Broad-band constrained inversion

1. 大庆油田测井公司, 大庆 163412;2. 长春地质学院, 长春 130026

Well logging Company, Daqing Pctroleum Administration, Daqing 163412

本文阐述的是一种地震岩性反演方法。这种方法是以地震信息为基础, 以地质、测井信息作为约束条件, 提出一个宽频带的初始波阻抗模型, 并使用一种随机迭代算法对初始模型进行修正, 以求得一个具有较高分辨率的最终波阻抗模型。此方法与传统的地震岩性反演方法相比较有许多优点, 这在本文的理论计算和实际资料处理中都得到了证明。这样, 就可直接使用求得的优化宽频带波阻抗模型, 进一步求取地层的岩性和孔隙度等物性参数。

This paper ptesents a technique for seismic lithology inversion which constructs an initial brond-band tripedance model based on seismic toformation and constrained by geological and logging information. The initial model is refined with a random iterative algorithm to obtain an ultimate impedance model with high resolution. Theoretical computation and real data processing show that the technique has advantages over conventional seismic lithology inversion techniques. As a result,the ultimate model can be used as a basis for calculation of various strata petroproperties.