组合震源对AVO的影响及校正方法  

Impacts of source array on AVO and its correction method

作　　者：徐峰[1] 陈祖银[1] 梁向豪[2] 

机构地区：[1]西南石油大学资源与环境学院,四川成都610500 [2]中国石油塔里木油田分公司,新疆库尔勒841000

出　　处：《石油地球物理勘探》2013年第6期866-870,1016+847,共5页Oil Geophysical Prospecting

基　　金：国家科技重大专项(2008ZX05046-01)资助

摘　　要：组合激发技术被广泛应用于地震勘探野外数据采集中,在陆上低信噪比地区和海域的应用更为频繁。但组合激发的地震波在空间不同方向上传播时能量具有差异性,这与AVO理论的单震源假设条件相矛盾。本文采用将相控理论与波动方程数值模拟相结合的方法,探究组合激发时地震波在各方向上的传播特点及其AVO曲线变化规律,总结出组合激发条件下的AVO曲线校正方法。理论模型试验结果表明,利用本文方法可有效消除由组合激发造成的AVO分析误差,提高AVO分析的精度并扩展其适用范围。Source arrays have been widely used in seismic exploration especially in low SNR land areas and offshore.However the energy propagation directions of all the source elements are difference in space.This is against AVO theory assumptions. Using wave equation numerical simulation and phase control theory,this article discusses characteristics of all the seismic energy propagation directions and the laws of their AVO curve variation. Further,we propose a method for AVO curve correction.Theoretical model test results show that the method can effectively eliminate AVO error caused by a source array,and it has great significance for the AVO analysis accuracy improvement.

关 键 词：组合震源 AVO析 相控阵列 能量校正 

分 类 号：P631[天文地球—地质矿产勘探]