基于构造时间控制的P-SV波静校正方法  

A P-SV WAVE STATIC CORRECTION METHOD BASED ON CONTROLLING STRUCTURE TIME

作　　者：马昭军[1] 唐建明[1] 

机构地区：[1]中国石油化工股份有限公司西南分公司勘探开发研究院德阳分院,四川德阳618000

出　　处：《物探化探计算技术》2008年第5期373-376,共4页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：中国石油化工股份有限公司重点科技攻关项目资助(P05003)

摘　　要：由于横波的低速带厚,并且不均匀,加之地表浅层横波速度相对较低,导致P-SV波静校正量大,并且横向变化剧烈。而目前大多数解决该静校正问题的方法都存在一些不足,这里提出了一种简单又易于实现的P-SV波静校正方法。首先,匹配同一层位的PP波和P-SV波同相轴,估计该区的纵、横波速度比γ0值;然后,在PP波和P-SV波共检波点叠加剖面上,利用该γ0值转换PP波构造时间到P-SV波相同构造时间,将该时间应用于P-SV波剖面上;最后,在消除大部分静校正量的P-SV波剖面上作互相关,消除道与道之间较小的时差。经实际数据处理表明,该方法能较好地解决P-SV波静校正问题,使记录质量得到明显提高。Because of the low velocity zone of S-wave is deep and inhomogeneous and its relative low velocity,the static correction value of P-SV wave is large and acute in transverse direction.And the present static correction methods are not very perfect to resolve P-SV wave static correction problems.In the paper,a simple and feasible static correction method is presented.Firstly,the same horizon event is corrected to estimate some value on P-P wave and P-SV wave sections.Then,the P-P wave structure time is converted to P-SV wave structure time by the value on P-P and P-SV wave common receiver point stack sections,and the P-SV structure time is applied on P-SV wave section.Finally,after removed most static,a cross-correction method is applied to remove small time difference on P-SV wave horizon.A real data processing indicates that the static correction method can resolve P-SV wave static correction problem,and the seismic record quality be improved clearly.The method has been applied to process 3D-3C data in XC area in the east of Sichuan successfully.

关 键 词：P—SV波 静校正 长波长 构造时间 互相关 

分 类 号：P631.4[天文地球—地质矿产勘探]