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Uses of wide-azimuth and variable-depth streamers for sub-basalt seismic imaging

机译：宽方位角和变深度拖缆在玄武岩地震成像中的应用

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摘要

An evaluation of dense wide-azimuth and variable-depth streamer acquisition techniques for sub-basalt imaging was carried out over the Faroe-Shetland Basin, northwest of Scotland in August 2010. The aim of this experimental survey was to enhance the low-frequency signal and to improve the attenuation of multiples and scattered energy, thereby obtaining better imaging beneath the complex basalt layer. In this area extensive sequences of basalt dominate the northwestern flank of the UK continental shelf. The vertical and lateral inhomogeneity of these basalt flows results in loss of bandwidth as well as loss of signal. All but the lowest-frequency seismic energy penetrating the basalt becomes incoherent either by attenuation or scattering. Scattering in particular poses a difficult problem due to the rugose top and base basalt and internal heterogeneity.
机译：2010年8月，在苏格兰西北部的法罗-设得兰群岛盆地对稠密的宽方位角和深浅流光采集技术进行了评估，以用于玄武岩成像。该实验调查的目的是增强低频信号并改善倍数和散射能量的衰减，从而在复杂的玄武岩层下获得更好的成像。在这一地区，玄武岩层系主导着英国大陆架的西北侧。这些玄武岩流的垂直和横向不均匀性导致带宽损失以及信号损失。穿透玄武岩的除了最低频率的地震能量以外的所有能量通过衰减或散射变得不相干。由于顶部和底部玄武岩的皱纹以及内部的不均匀性，特别是散射带来了一个难题。

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