多测井曲线拟声波重构技术的应用

基于多曲线的拟声波重构技术，对声波曲线进行合理重构，用于测井约束地震反演，可实现对储集层的预测。在重构中遵循两个原则，即声波时差的低频变化趋势应符合地层压实效应；高频变化趋势能较好地区分岩性。通过小波变换频谱分解、多元回归、量纲转换及严格的数学运算等一系列步骤进行曲线重构。测井曲线处理重构后的曲线，基本保持了原来的地质规律，并显著提高了砂体的分辨率，为波阻抗反演提供了较好的声波资料。

Application of Pseudo Sonic Log Recomposition Technique Based on Multiple Well Logs

In this paper, the advantages and disadvantages of predecessors’methods are discussed, and the pseudo sonic log recomposition technique based on multiple well logs is proposed to be used for logging?constrained inversion for the purpose of reservoir prediction. The technique is based on two principles in the recomposition: one is the low?frequency changing trend of interval transit time should accord with the formation compaction regulation; the other is its high?frequency part should enable to well distinguish related lithology. The recomposition include wavelet transform spectrum decomposition, multiple regression, dimension conversion, arithmetical operation, etc. The practical log data processing shows that the recomposition well logs can not only remain the original geologic characteristics, but also obviously improve the sand resolution, it can highlight the difference from the surrounding rocks, hence provide solid support in sonic log datafor wave impedance inversion