一种提高VSP分辨率的反Q滤波方法

A method for improving VSP resolution by inverse Q filtering

由于VSP记录的地震波的衰减程度与地面地震记录的地震波的衰减程度不同,因此对VSP资料进行反Q滤波处理,直接应用地面地震资料的反Q滤波方法是不准确的,需要对其进行改进。本文基于Wang处理地面地震资料的反Q滤波方法,提出一种适用于VSP资料的反Q滤波方法,即先对VSP资料上、下行波场进行分离,然后根据VSP上、下行波各自的波场特点,分别进行反Q滤波补偿。采用此法对模型数据和实际VSP资料分别进行反Q滤波补偿处理,均取得了比较好的效果。

Because the difference of seismic wave attenuation between VSP and surface seismic,it is inaccurate to use inverse Q filtering method of processing directly surface seismic data.Based on the inverse Q filtering for surface seismic data(Wang),we propose in this paper an inverse Q filtering suitable for VSP data.Firstly we apply wave field separation of upgoing wave and downgoing wave on VSP data.Then we use inverse Q filtering compensation according to VSP upgoing and downing wave characteristics.Test results of this method on model data and real VSP data show that our inverse Q filtering compensation is reliable.