样条曲线拟合初至波剩余静校正方法  

A methord of residual static corrections based on fitting first_break using spline function

作　　者：周强[1,2] 曹琳昱 曹中林[1,2] 陈爱萍[1,2] 杜洋 

机构地区：[1]中国石油集团川庆钻探工程有限公司地球物理勘探公司,成都610213 [2]中国石油天然气集团公司山地地震技术试验基地,成都610213 [3]中国石油集团川庆钻探工程有限公司地质勘探开发研究院,成都610051

出　　处：《地球物理学进展》2015年第3期1329-1332,共4页Progress in Geophysics

摘　　要：针对复杂探区因模型道品质差导致反射波剩余静校正效果不好的难题,本文提出了一种基于样条曲线拟合的二维初至波剩余静校正方法.该方法相对直线拟合法,可以用的初至信息更多,统计的短波长静校正量更为准确;相对折线拟合法,它不用拾取折射拐点,操作方便快捷,更具有可操作性.它采用三次样条函数将应用了长波长静校正量的初至拟合成一条光滑曲线,根据地表一致性原则将延迟时分解为炮点、检波点短波长静校正量.实际资料应用结果表明,基于样条曲线拟合的单炮初至变得光滑,叠加剖面同相轴连续性得到增强,可为反射波剩余静校正提供较好品质的模型道,对低信噪比资料剩余静校正问题的解决具有实际意义.This paper proposes a residual statics methord based on fitting first-break, which can be more accuratet than strightline due to more statistical information, can be more convenient than fold-line due to not picking inflection points. It uses cubic spline function to fitting first-break used long-wave statics to calculate delay time, which is then decomposed into detect and source shot-wave statics based on surface-eonsisitent model. Result of seismic data showes that the methord can smooth firet-break, make hyperbola characteristic of reflection wave in shot gathers more obvious, support superior model traces for reflected residual statics. It may be helpful for resolving the statics promblem of low signal to noise ratio data.

关 键 词：静校正 剩余 短波长 初至波 样条曲线 

分 类 号：P631[天文地球—地质矿产勘探]