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首页> 外文期刊>First Break >A deep-towed multichannel seismic streamer for very high-resolution surveys in full ocean depth
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A deep-towed multichannel seismic streamer for very high-resolution surveys in full ocean depth

机译：一种深拖多道地震拖缆，用于在整个海洋深度中进行非常高分辨率的测量

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摘要

The vertical and lateral resolution of marine subsurface structures in reflection seismic images strongly depends on the marine seismic source and streamer system used for signal generation and data acquisition. The vertical resolution is controlled by the dominant frequency and bandwidth of the reflected signals and can be improved by using high(er)-frequency sources like GI- or waterguns in deep water and boomers or sparkers in shallow water. Deconvolution tries to optimize the vertical resolution by increasing the bandwidth. The lateral resolution is determined by the size of the Fresnel zone whose diameter depends on the source and streamer depth and on the depth of the reflector, respectively, on the velocity above the reflector and on the dominant frequency. Migration increases the in-line resolution by reducing the in-line diameter of the Fresnel zone to approximately half a dominant wavelength, but has no influence on the cross-line resolution (Lindsey, 1989; Yilmaz, 2001). The latter can only be improved by lowering the streamer and - in the ideal case - the source towards to the sea floor.
机译：反射地震图像中海洋地下结构的垂直和横向分辨率在很大程度上取决于用于信号生成和数据采集的海洋地震源和拖缆系统。垂直分辨率由反射信号的主频和带宽控制，可以通过使用较高频率的信号源（如深水中的GI或水枪以及浅水中的临时臂或火花）来提高。反卷积试图通过增加带宽来优化垂直分辨率。横向分辨率由菲涅耳区的大小决定，菲涅耳区的直径分别取决于光源和拖缆的深度以及反射镜的深度，反射镜上方的速度和主导频率。迁移通过将菲涅耳带的线内直径减小到大约主波长的一半来提高线内分辨率，但对交叉线分辨率没有影响（Lindsey，1989; Yilmaz，2001）。只能通过降低拖缆和（在理想情况下）将源降低到海床来改善后者。

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