椭圆展开法共炮点道集速度分析方法  

Common shot gather velocity analysis based on the elliptic development method

作　　者：杜启振[1] 胡晓婷[1] 

机构地区：[1]中国石油大学(华东)地球资源与信息学院,山东东营257061

出　　处：《石油地球物理勘探》2010年第3期332-336,共5页Oil Geophysical Prospecting

基　　金：教育部新世纪优秀人才支持计划(资助号:NCET-07-0845);国家高技术研究发展计划(批准号:2006AA06A202);中国石油天然气集团公司创新基金(批准号:05E7028);中国石油天然气集团公司物探重点实验室开放基金(批准号:GPKL0802)联合资助

摘　　要：以椭圆展开理论为基础,本文提出了基于共炮点道集数据的速度分析方法,给出了相应的速度分析流程;通过选定速度范围,采用椭圆展开并相干叠加的方法,利用共炮点道集求取每一速度的零炮检距叠加剖面;对得到的零炮检距叠加剖面进行选排形成共法向出射点速度谱,按照能量最大准则确定每一个法向出射点的速度;进而利用拾取的速度求取真正的零炮检距叠加剖面。该速度分析方法无需预先抽取速度分析道集,避免了常规速度分析中共反射点弥散的问题。模型试算表明了该方法的正确性和有效性。Based on the elliptic development theory,a new method for common shot gather velocity analysis was proposed and the \esponding workflow was introduced in this paper.At first for selected velocity range,based on common shot gathers the elliptic development and coherent stacking were used to calculate zero offset stacking section for every velocity,secondly by sorting the calculated zero offset stacking sections,the common normal emergence point velocity spectrum were generated,according to the maximum energy criterion,the velocity for every common normal emergence point was determined,at last by utilizing the picked velocity,the true zero offset stacking sections were acquired.In the velocity analysis method,the previously sorting of the velocity analysis gathers was not needed,and the common reflection point dispersion in routine velocity analysis was avoided.The results of model testing demonstrate the validity and accuracy of this method.

关 键 词：椭圆展开 共法向出射点速度谱 均方根速度 零炮检距剖面 共炮点道集 

分 类 号：P618.13[天文地球—矿床学]