基于测井曲线分频分析的地震反演

Seismic inversion based on logging trace frequency-shared analysis

测井曲线是地层中多种信息的综合响应,不同频率尺度测井曲线表现出不同的形态,反映不同的地质与沉积特征。针对陆相沉积的复杂储层结构,本文提出一种分频分析方法:首先根据测井曲线的响应特征,分析不同频率尺度的储层岩石物性参数与地质特性的相关性,为岩石物性分频反演及沉积相横向变化预测提供依据;大尺度(低频)分量反映大套地层特征,中小尺度(中高频)分量反映地层局部细微特征;储层的非均质性和含油气性对小尺度分量反应更敏感。据此进行了岩石物性参数不同频率尺度下的非线性联合反演,得到了高分辨率岩石物性反演结果,表明此法可提高储层横向预测精度,改善储层空间的可描述性。

Logging trace is integrative response of multiple data in strata, and the logging traces in different frequency scale show the different shapes and reflect different geologic and sedimentary features. Facing the complex continental facies reservoir structure,the paper presented frequency-shared approach; first, according to the response character of logging trace, the paper analyzed the correlation of petrophysical parameters with geologic feature of the reservoir in different frequency scales,providing basis for petrophysical frequency-shared inversion and lateral variation of sedimentary facies; large scale (low frequencies) components reflect the feature of series of strata,mid-small scale (mid-higher frequencies) components reflect local fine feature; the reaction of non-homogeneity and oil/ gas-bearing ability of reservoir on small scale components are more sensitive. On that basis,non-linear joint inversion of petrophysical parameters in different frequency scales was carried out, getting high-resolution petrophysical inversive results, which showed that the approach can improve the lateral prediction precision and spatial description of reservoir