覆盖次数与信噪比的定量关系分析  

The analysis on the quantitative relationship between the fold and SNR

作　　者：步长城[1] 徐辉[1] 玄长虹[1] 朱洪昌[1] 

机构地区：[1]胜利油田分公司物探研究院

出　　处：《油气地球物理》2011年第3期48-52,共5页Petroleum Geophysics

摘　　要：如何选取合适的覆盖次数才能既达到所希望的信噪比,又能够合理控制采集的投资,是高精度三维地震资料采集必须考虑的实际问题。以永新48线75炮细分面元观测系统为基础,通过观测系统退化方法,获得了8种覆盖次数相对较均匀的观测系统,利用频谱估算的信噪比计算方法,对相同面元不同覆盖次数、不同面元相同覆盖次数以及不同噪音背景下的资料进行信噪比的定量分析、统计,研究出了覆盖次数与信噪比的关系曲线,并最终得出了对高精度采集和投资决策有益的结论。In the 3D seismic data acquisition with high accuracy,how to choose the suitable fold for both obtaining the expected S/N and reasonably controlling the acquisition investment,which must be considered in the real world situation.Eight new recording geometries with steady fold have been obtained through the medium of recording geometry degenerate,based on Yongxin subdivide bin recording geometry with 48 detect-lines and 75 shots.Using SNR calculation method of spectral estimate to have a quantitative analysis and research on the relationship between fold and SNR in case of the same bin with different fold,different bin with the same fold as well as the same bin with differ fold and differ noise background,the relationship curve of fold and SNR has been studied,with useful conclusions for high accuracy acquisition and investment decisions.

关 键 词：高精度 覆盖次数 信噪比 观测系统退化 定量关系分析 

分 类 号：P631.4[天文地球—地质矿产勘探]