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。
关键词:
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双检合成
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鸣震
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海底电缆
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匹配
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维纳滤波
Abstract:
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.
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