综合静校正技术在龙门山双复杂地区的应用  

Application of Comprehensive Static Correction in Longmen Mountains dual-complex Areas

作　　者：黄健 刘远志 刘胜 雷扬 张志锋 梁正洪 

机构地区：[1]中石化石油工程地球物理有限公司西南分公司,四川德阳618000

出　　处：《内蒙古石油化工》2015年第Z1期85-90,共6页Inner Mongolia Petrochemical Industry

基　　金：中石化股份公司科研项目<龙门山山前带地震采集技术研究与应用>(编号:JP14037)资助

摘　　要：双复杂地区地表结构及地下构造均复杂,地震资料信噪比低,静校正问题非常突出。以横穿龙门山双复杂地区某二维地震测线为例,通过分析龙门山地区近地表结构的复杂性及静校正的难点,并比较各种静校正技术的适用条件,确定了综合应用静校正技术的思路。首先把进行平滑后的高程作为浮动基准面,应用层析反演方法在该基准面上计算炮、检点静校正量,并应用于数据体上,进行速度分析和动校正等常规处理,再将浮动基准面校正到最终基准面上,最后通过全局寻优反射波剩余静校正技术计算剩余静校正量并应用于数据。实际应用效果表明:综合静校正技术能较好的解决双复杂地区静校正问题,使地震剖面的成像质量得到了明显提高。In dual-complex areas,near-surface structure and target formation in buried depth are complex,S/N of seismic data is very low and static problem is very serious.Taking a 2-D seismic line crossing longmen mountains dual-complex areas as an example,by the analysis of the complexity of the near surface structure and the difficulty of the static correction in the Longmen mountain area,and to compare the applicable conditions of various static correction techniques,the idea of the integrated application of the static correction technology was determined.Firstly,the elevation of rugged surface is smoothed and taken as floating datum.Then,on this floating datum,first break tomography inversion method is applied to calculate statics of shot points and receiving points,the calculated results are used on data set,and the data set is used to conventional processing including velocity analysis and NMO,and elevation method is used to calculate the statics of shot points and receiving points between floating datum and terminal datum.Finally,the statics is calculated by the residual static correction technique of the global optimization and is applied to the data set.Actual application results show that the comprehensive static correction technology can better solve the problem of static correction in the dual-complex areas,and the seismic imaging quality has been obviously improved.

关 键 词：双复杂地区 综合静校正 浮动基准面 层析静校正 全局寻优 

分 类 号：P631.4[天文地球—地质矿产勘探]