基于维纳滤波的双检合成鸣震压制技术
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摘要
基于水陆2种检波器响应机制差异的双检合成处理技术,通过对二者记录合并相加,能够有效压制海底电缆双检地震勘探中的鸣震干扰。然而,由于水检和陆检在振幅、频率等响应特征上差异较大,直接相加处理不能达到理想效果,通常需要进行匹配处理后再相加。理想情况下,匹配系数为与海底反射系数相关的固定值,而实际上海底反射系数是变化的,采用固定匹配系数效果较差。在深入研究双检勘探波场传播机制及匹配技术的基础上,提出了基于维纳滤波方法的自适应时空变匹配滤波技术,通过理论模拟记录的试算和实际资料处理,均取得了满意效果,验证了该方法的有效性。
The technology of dual-sensor merger based on the individual corresponding mechanism of hydrophones and vertical geophones can effectively suppress the reverberation in the dual-sensor OBC exploration by merging of the dual-sensor signals.However,since there are big differences in amplitude and frequency between the hydrophone and vertical geophone,it is not able to achieve a desired effect by directly merging the dual-sensor signals.There usually needs a match between the dual-sensor signals before merging.It would be ideal if the matching coefficient is a fixed value related to the reflection coefficient of sea floor.However,it is not the case.We are not able to get good results as expected from a fixed matching coefficient.In this regard,we made a deep research on the wave field propagation mechanisms in the dual-sensor OBC exploration and the matching technique.Then an adaptively time-varying matched filtering technique based on the Wiener filtering method was proposed.Satisfactory results have been obtained in practice.
The technology of dual-sensor merger based on the individual corresponding mechanism of hydrophones and vertical geophones can effectively suppress the reverberation in the dual-sensor OBC exploration by merging of the dual-sensor signals.However,since there are big differences in amplitude and frequency between the hydrophone and vertical geophone,it is not able to achieve a desired effect by directly merging the dual-sensor signals.There usually needs a match between the dual-sensor signals before merging.It would be ideal if the matching coefficient is a fixed value related to the reflection coefficient of sea floor.However,it is not the case.We are not able to get good results as expected from a fixed matching coefficient.In this regard,we made a deep research on the wave field propagation mechanisms in the dual-sensor OBC exploration and the matching technique.Then an adaptively time-varying matched filtering technique based on the Wiener filtering method was proposed.Satisfactory results have been obtained in practice.
引文
[1]Barr F,Sanders J I.Attenuation of water-column reverber-ations using pressure and velocity detectors in a water-bot-tom cable[M]∥59th Ann.Internat.Mtg.,Soc.of Expl.Geophys.,Expanded Abstracts,1989:653-656.
[2]全海燕,韩立强.海底电缆双检接收技术压制水柱混响[J].石油地球物理勘探,2005,40(1):7-12.
[3]Fred J B.Dual-sensor OBC technology[J].The LeadingEdge,1997,16(1):45-51.
[4]Hoffe B H,Lines L R,Cary P W.Applications of OBC re-cording[J].The Leading Edge,2000,19(4):382-391.
[5]王振华,夏庆龙,田立新,等.消除海底电缆双检地震资料中的鸣震干扰[J].石油地球物理勘探,2008,43(6):626-635.
[6]贺兆全,张保庆,刘原英,等.双检理论研究及合成处理[J].石油地球物理勘探,2011,46(4):522-528.
[7]丁伟,张家田.地震勘探检波器的理论与应用[M].西安:陕西科学技术出版社,2006.
[8]张文波,朱光明.海底电缆数据中压力分量与垂直分量的分析与应用[J].地球科学与环境学报,2005,27(1):72-75.
[9]Verschuur D J.地震多次波去除技术的过去、现在和未来[M].陈浩林,张保庆,刘军,等,译.北京:石油工业出版社,2010.
[10]OBC双检资料处理中的相位问题[EB/OL].[2012-07-01].http://www.agoil.cn/bbs/simple/?t241388.html
[2]全海燕,韩立强.海底电缆双检接收技术压制水柱混响[J].石油地球物理勘探,2005,40(1):7-12.
[3]Fred J B.Dual-sensor OBC technology[J].The LeadingEdge,1997,16(1):45-51.
[4]Hoffe B H,Lines L R,Cary P W.Applications of OBC re-cording[J].The Leading Edge,2000,19(4):382-391.
[5]王振华,夏庆龙,田立新,等.消除海底电缆双检地震资料中的鸣震干扰[J].石油地球物理勘探,2008,43(6):626-635.
[6]贺兆全,张保庆,刘原英,等.双检理论研究及合成处理[J].石油地球物理勘探,2011,46(4):522-528.
[7]丁伟,张家田.地震勘探检波器的理论与应用[M].西安:陕西科学技术出版社,2006.
[8]张文波,朱光明.海底电缆数据中压力分量与垂直分量的分析与应用[J].地球科学与环境学报,2005,27(1):72-75.
[9]Verschuur D J.地震多次波去除技术的过去、现在和未来[M].陈浩林,张保庆,刘军,等,译.北京:石油工业出版社,2010.
[10]OBC双检资料处理中的相位问题[EB/OL].[2012-07-01].http://www.agoil.cn/bbs/simple/?t241388.html
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