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Marine broadband case study offshore China

机译：中国近海海上宽带案例研究

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摘要

Dual tow-depth acquisition configurations are used to mitigate the band-limiting effect of the sea-surface ghost in marine streamer surveys. Here we report on the analysis of a 2D broadband marine seismic project acquired offshore China. The deployment configuration included over/under sources and three streamers towed at different depths (5, 17, and 23 m). This configuration allowed not only for analysis of dual tow depth as a method for increasing bandwidth, but also for evaluation of two distinct dual tow-depth combinations, over/under and sparse-under. The project provided the first opportunity to make this comparison. Evaluation of reflection images, filter panels, amplitude spectra, and signaloise separations dem-onstrates that both techniques are effective at compensating for the filtering effect of the ghost response, but also suggest that the improved results from each dual tow-depth technique are very comparable. Given the operational advantages of the sparse-under technique, due to the reduced streamer requirements, we conclude that the sparse-under technique is an attractive option for 3D deployments.
机译：双拖深度采集配置用于减轻海上拖缆勘测中海面幻影的频带限制作用。在这里，我们报告了对中国离岸的二维宽带海洋地震项目的分析。部署配置包括源头上方/下方和三个拖缆，拖曳深度不同（5、17和23 m）。这种配置不仅允许分析双丝束深度作为增加带宽的一种方法，而且还允许评估两种不同的双丝束深度组合，即上/下和稀疏。该项目提供了进行这种比较的第一个机会。对反射图像，滤光片面板，振幅谱以及信号/噪声分离的评估表明，这两种技术都可以有效补偿幻影响应的滤波效果，但同时也表明，每种双拖深技术的改进结果都是：非常可比。鉴于稀疏技术的操作优势，由于减少了拖缆的要求，我们得出结论，稀疏技术对于3D部署是有吸引力的选择。

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