基于模型的P-SV转换波AVA反演预处理  

Research on Converted Wave AVA Trace Gathering Technology

作　　者：鲁统祥[1] 何兵寿[1] 

机构地区：[1]中国海洋大学海底科学与探测技术教育部重点实验室,山东青岛266100

出　　处：《中国煤炭地质》2011年第2期42-47,共6页Coal Geology of China

摘　　要：转换波AVA反演是利用转换波资料获取地下弹性参数的有效手段,AVA道集的准确抽取是利用AVA道集进行转换波资料反演的前提。基于模型抽取共转换点道集的处理思路是:首先依据目的层构造模型,采用基于模型的转换波速度分析方法获取目标层的纵横波速度比,在此基础上计算各道对应的转换点位置,进而抽取共转换点道集;以获得的共转换点道集为输入数据,采用三参量速度分析与动校正技术实现转换波资料动校正;在均方根意义下通过求取转换波的射线路径获得入射角信息并最终抽取转换波AVA反演道集。另外为消除因入射角分布不均造成的空道现象,提出了大面元法,该方法不仅对缺失的入射角有补偿作用,还能在一定程度上提高地震资料的信噪比。Converted wave AVA inversion is an effective method to get underground elastic parameters using converted wave data,while collecting AVA gathers accurately is the condition to use AVA gathers to invert.The article collected common conversion point gather on the base of model,first,we used the tectonic model of intended interval,then got the velocity ratio of the intended interval using the converted wave analysis method basing on model,and got the accurate converted point,then collected common conversion point gather using the common conversion point gather data,used the three parameters velocity analysis and NMO correction to carry out the converted wave NMO correction;then got the incident angle and eventually collected the converted wave AVA inversion gather by calculating the converted wave ray path.This article also presented a method to eliminate the phenomenon of the zero gather caused by the uneven angle distribution,and data processing achieved good effect.Besides,to eliminate the phenomenon of the zero gather caused by the uneven angle distribution,the article presented binning method,this method not only can compensate the lacking incident angles,but also improve the signal to noise ratio of the seismic data

关 键 词：P-SV转换波 共转换点道集 AVA反演 大面元法 

分 类 号：P631.4[天文地球—地质矿产勘探]