基于调谐频率与分频处理的高分辨率反演技术

High resolution inversion based on tuning frequency and frequency decomposition.

1. 成都理工大学, 四川成都610059;2. 中国石油化工股份有限公司南方勘探开发分公司, 云南昆明650200

Chengdu University of Technology.Chengdu 610059,China

讨论了基于调谐频率与分频处理的高分辨率反演技术,给出了方法的基本原理,即利用地震数据的调谐频率和分频处理分析,半定量地确定储层厚度,并将其作为地震反演的约束条件。方法的实现过程是:通过层状地质模型的地震正演模拟,建立不同主频子波时地层厚度与调谐频率的关系;利用地震资料时-频分析技术,实现地震资料分频处理;利用合成地震记录标定地震子波主频;利用分频处理结果,借助于调谐频率分析与调谐振幅分析,给出地震反演约束条件;利用反演算法消除地震子波影响,提高和拓展地震资料的频带范围,实现储层的高分辨率成像。普光地区的应用实例表明,调谐频率与分频处理的高分辨率反演方法无需对储层空间变化规律进行假设,适用于强非均质碳酸盐岩储层的高分辨率成像。

This paper discussed high-resolution inversion based on tuning frequency and frequency decomposition.The thickness of reservoir, which would be a restriction to seismic inversion, is estimated half-quantitatively by tuning frequency and frequency decomposition..The implementing process is as following: building the relationship between the thickness of formation and the tuning frequency through forwardmodeling at different frequency; performing frequency decomposition processing to the seismic data; identifying the center frequency of the wavelet using synthetic seismic record; presenting the restriction to seismic inversion using the frequency decomposition processing results; diminishing the effect of the wavelet to extend the band so as to improve the resolution.The example of Pu-Guang shows this high resolution inversion can adapt well to high inhomogeneous carbonate reservoir and improve the resolution of image regardless the transversely variation of the reservoir.