反射波地震资料的信息分辨率

The information resolution of reflection seismic data

江汉石油学院, 荆州434102

Jianhan Petrolcum Institute, Jingzhou 434102

反射波地震资料的薄层信息分辨率能否突破Widess分辨率极限,是关系到反射波地震资料能否用于油田开发阶段储层地球物理参数研究的重大技术问题,也是一个亟待解决的理论问题。本文采用沃尔什(Walsh)函数理论和线性系统理论,探讨了地层最小厚度与最高序率的关系,提出了“信息分辨率”的新概念。本文的研究结果表明,反射波的薄层信息分辨率可达到一个时间采样间隔。在1ms时间采样间隔不,层速度为3000m/s时,主频为30Hz的最小相位雷克子波的信息分辨率为1.5m.比相同参数时的Widess分辨率λ/8=12.5m高8.3倍。达到了研究油田开发阶段储层特性的薄层分辨率要求(1m左右).

Whether the information resolution of the reflection seismic data exceeds the limit of the Widess resolution or not is considered to be an important technical problem while applying the reflection data to the study of reservoir geophysical parameters for oilfield development. Also it is a theoretic problem to be solved urgently. The paper details the relation of the thinest strata thickness to the sequence rate by using the Walsh function and the linear system theories, and presents the new concept “information resolution ” The research results in the paper indicate that the information resolution for thin beds may reach One time sample interval. When the interval velocity is 3000m/s and the sample interval is 1ms, the minimum-phase Ricker wavelet with 30Hz dominent frequency may resolve the thin bed of 1. 5m. 8.3 tims higher than the Widess resolution λ/8=12. 5m with the same parameters, meeting the need （around 1m) of studying the reservoir properties in oilfield development stage.