利用初至波走时速度成像进行近地表静校正的方法  

NEAR-SURFACE STATIC CORRECTION METHOD USING FIRST-ARRIVAL TRAVELTIMES VELOCITY TOMOGRAPHY

作　　者：刘振宽[1] 吴永刚[1] 刘英杰[1] 于晶[1] 

机构地区：[1]大庆石油管理局勘探开发研究院

出　　处：《地球物理学报》1995年第A01期153-159,共7页Chinese Journal of Geophysics

基　　金：国家自然科学基金

摘　　要：提出了一种利用常规地震初至波走时速度成像进行近地表静校正的方法．该方法的基础是回折波射线的走时层析成像，它能准确地求出近地表连续速度分布，用浅层速度成像结果能够得到准确的近地表静校正量．文中给出了初至波走时射线层析成像的理论模型试验结果，成像是令人满意的．对大庆古龙地区的一段实际资料进行实验，用速度成像结果得出的静校正量对该资料进行了近地表静校正，校正后的叠加剖面比常规叠加剖面和折射静校正后的叠加剖面有较大的改善．A method is presented here for near-surface static correction from seismic first-arrival traveltimes in conventional seismic serveys using velocity tomography. The method is based on turning ray traveltime tomography, and allows for determination of continuous near-surface velocity distribution. The shallow velocity imaging estimated provides for more accurately near-sruface statics. The calculation of the theoritical model for first-arrival traveltimes ray tomograyhy gives satisfactory results. The method is applied to a real data from the Daqing GULONG area. The stacked section which is obtained through near-surface static corrections using the statics computed from the velocity tomographic imaging is more improved than the conventional.

关 键 词：层析成像 近地表静校正 石油 地震勘探 

分 类 号：P618.130.8[天文地球—矿床学] P631.443[天文地球—地质学]