转换波静校正技术在四川地区的应用研究  

Application study of statics correction technology for P-SV wave in Sichuan area

作　　者：杨海涛 贺振华[1] 陈丹[2] 王栋[1,2] 王静[2] 王鸿燕[2] 

机构地区：[1]成都理工大学,成都610059 [2]中国石油天然气集团公司川庆钻探工程有限公司地球物理勘探公司,成都610213 [3]中国石油天然气集团公司山地地震技术试验基地,成都610213

出　　处：《地球物理学进展》2017年第4期1701-1704,共4页Progress in Geophysics

摘　　要：转换波静校正问题一直被认为是转换波处理中较难解决的问题,目前已研究的方法都存在一定的局限性.针对四川盆地川中地区实际情况,本文提出一种组合的转换波静校正方法.首先,根据采集的三分量微测井资料计算低降速层的纵、横波平均速度比,再利用该速度比与纵波的检波点静校正量相乘计算得到转换波长波长静校正量;然后,应用改进的共检波点叠加互相关法求取转换波短波长静校正量;最后,利用分频地表一致性剩余静校正求取剩余静校正量.实际数据处理表明,该转换波静校正技术能够较好地解决四川地区转换波静校正问题,使地震资料的成像效果得到明显的改善.The converted wave statics correction problem has always been considered asmore difficult to resolve in processing converted wave.At present the researched converted wave statics correction methods have some deficiencies.Aiming at the actual situation in Sichuan area.we proposed the combined statics method for P-SV wave.Firstly,The average velocity ratio of P-wave and Swave is obtained by multi-component micro logging data.The converted wave long wavelength static correction is computed according to P-wave receiver statics and the ratio.Secondly,the improved cross-correction method is used to calculate short wavelength statics correction on common receiver stack gathers.Lastly,Residual static correction is obtained by using the residual static correction in the frequency division.The real data processing shows that this method can be used to solve the problem of converted wave static correction,and remarkably improve the quality of the converted wave records.The method has been applied to the data processing in Sichuan and good results have been obtained.

关 键 词：转换波静校正 时空变GAMMA系数法 改进的共检波点叠加互相关法 分频地表一致性剩余静校正 

分 类 号：P631[天文地球—地质矿产勘探]