一种常规检波器的低频恢复方法  

Low frequency recovery method for a conventional geophone record

作　　者：芮拥军[1] 

机构地区：[1]胜利油田分公司物探研究院,山东东营257022

出　　处：《物探与化探》2016年第6期1198-1202,共5页Geophysical and Geochemical Exploration

基　　金：国家高技术研究发展计划("863"计划)项目"陆上非一致性时延地震;微地震油藏监测方法研究"(2011AA060303)

摘　　要：在地震勘探中,低频地震信号的重要作用日益凸显。在实际工作中,通常使用自然频率为10 Hz的动圈式检波器,致使接收到的低频信号被畸变,可信度大幅度降低。全面替换常规检波器为低频检波器,虽然可以获得真实的低频信号,但面临试验周期长、替换费用高等实际问题。为解决常规检波器地震数据低频畸变的问题,提出了一种实用的常规检波器低频恢复方法,以台站式低频检波器与常规检波器同源共点数据为基础,估算常规检波器的最低有效频率并构建反滤波算子,实现了常规检波器地震数据的低频恢复。B3Q的实际应用表明,该技术可以有效恢复常规检波器资料的低频信息,拓宽地震资料的有效倍频程,提高地震资料解决岩性问题的能力,具有广阔的应用前景。In seismic exploration,the low frequencies have played a significant role in increasing the resolution of seismic images in re-cent years.In practice the geophones usually have 10 Hz natural frequency,which indicates the distortion of the seismic signals bellow 10 Hz.The broad replacement of 10 Hz geophones with the low-frequency geophones can get ＆quot;real＆quot; low frequency. This replacement process however,meets with many challenges, such as difficulties in research,long period of experiments,and high cost of low-frequency geophones.To mitigate the difficulties caused by these challenges the authors propose a practical method to estimate and recover the val-id low frequencies of the conventional geophone data. In order to solve the problem of low frequency distortion in conventional geophone seismic data,the author put forward a practicable conventional low-frequency detector recovery method for low frequency geophone and, on the basis of homologous concurrent data,estimated the lowest effective frequency of conventional geophone and constructed the in-verse filtering operator so as to realize low frequency recovery of conventional geophone seismic data. The practical application of B3Q shows that this technique can effectively recover the low frequency information of the conventional detector,expand the effective frequen-cy doubling of seismic data,and improve the seismic data for solving the problem of lithology,thus having a broad application prospect.

关 键 词：低频信号 自然频率 最低有效频率 低频恢复 

分 类 号：P631.4[天文地球—地质矿产勘探]