Numerical simulation and feature analysis of OBC dual-sensor data
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摘要: 海底电缆双检采集是滩浅海地区地震勘探的重要手段.目前，国内外对双检资料的研究主要集中在鸣震压制方面，而对双检资料中有效波和鸣震的传播规律和陷频特征等研究较少.为了理清有效波和鸣震在水检和陆检中不同响应产生的原因，本文针对海底电缆双检资料开展正演模拟研究，利用二维声波方程的一阶应力-速度方程中的压力和垂向速度分量表示水检和陆检进行正演模拟，并采用自由表面的应力镜像法处理气水边界，形成了双检资料针对性正演模拟技术；分析有效波和鸣震在双检中的波场传播特征，以及不同水深双检资料的陷频规律，为双检资料鸣震压制等处理提供理论依据.Abstract: The dualsensor acquisition of ocean bottom cable (OBC) is important tool for seismic exploration in the shallow sea area. At present, the research ofdualsensor seismic data is mainly focused on thesuppressionof ghost wave, lack of the research on propagating law and notch characteristic for effective wave and ghost wave. In order to clarify the reason of different response for effective wave and ghost wave in the geophone and hydrophone seismic data, we have carried out the numerical simulation research on OBC dualsensor data, used the firstorder stress-velocity equation to do seismic simulationin which the hydrophone data and geophone data are respected by pressurecomponentand vertical velocity component respectively under the 2D acoustic hypothesis, and applied the stressanti-symmetry method to solve the free surface boundary between gas and water, so the targeted seismic simulation method of dual sensor data had been developed. And we have analyzed the propagating characteristics of effective wave and ghost wavein dual sensor seismic data. And from the analysis we can know that there are large differences in amplitude, phase and frequency between hydrophonedata and geophonedata of our modeling results, and there are also differences in various water depths. In addition, we have obtained the frequency notch phenomenon of ghost in the hydrophone data, which can provide theoretical guidance for the processing and interpretation of the OBC dualsensor data.
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Key words:
- OBC /
- dual-sensor /
- numerical simulation /
- feature analysis /
- frequency notch
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