初至振幅分析技术在OBN采集质控中的应用

    Application of first-break amplitude analysis technology in quality control during ocean bottom node acquisition

    • 摘要: 海底节点(OBN)具有施工方式更灵活、海底耦合更好、资料信噪比更高等优势,但同时盲采的采集方式也带来了很多采集质控难题,如节点钟漂校正的准确性验证较复杂,以及如何验证矢量旋转后陆检三分量数据旋转准确性、如何准确判断水下节点拖动后定位的准确性等。本文研究提取节点的近偏移距初至波信息,通过选择合适的排列和插值,生成节点四分量振幅图,研究不同情况下的振幅属性表现,达到针对性质控的目的。该方法在实际生产应用中起到了很好的质控效果,目前已成为OBN生产中采集质控的重要手段。

       

      Abstract: The ocean bottom node (OBN) boasts the advantages of more flexible deployment, better seabed coupling, and higher signal-to-noise ratio (SNR). However, the non-real-time acquisition mode also raises many challenges for quality control. These include cumbersome verification of the OBN clock drift correction accuracy, as well as a lack of methods for accurately verifying the rotation accuracy of three-component geophone data after vector rotation and the OBN positioning accuracy after underwater towing events. This study extracted the information on near-offset first breaks from the OBN data to generate a four-component amplitude diagram through appropriate arrangement and difference calculation. By investigating the amplitude attributes under different conditions, targeted quality control was achieved. This method demonstrated excellent quality control effects in practical applications, making it an important tool for quality control in OBN acquisition.

       

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