Estimating ocean currents from the shapes of laterally steered streamer arrays
Estimating ocean currents from the shapes of laterally steered streamer arrays
复制标题
根据横向操纵拖缆阵列的形状估计洋流
DOI：
10.3997/1365-2397.2014018
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
E. Shuckburgh
中科院分区：
文献类型：
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作者：
T. Grant;R. Laws;E. Shuckburgh
在进行海洋地震勘测时，洋流明显地干扰地震拖缆偏离其期望位置。为了准确地监测储层，拖缆中的接收器必须尽可能地靠近其先前的位置。因此，需要知道真实的电流。以前的工作是利用拖缆的位置和张力来推断海流。然而，在许多拖缆系统中，不沿拖缆沿着测量张力。为了克服这个问题，我们建议，通过假设洋流是水平发散自由，它应该仍然是可能的重建电流从多个拖缆的位置。此外，以前的工作假设，当建模的拖缆，弯曲刚度可以忽略不计。目前尚不清楚，这个假设是正确的转向装置时，因此，我们检查这个假设，使用一种新的有限差分格式，包括弯曲刚度，并得出结论，这是安全的。如果采用这种推断海流的方法，所得到的资料不仅对地震业有价值，而且对希望研究次中尺度过程的海洋学家也有用处
When conducting marine seismic surveys, ocean currents noticeably perturb seismic streamers from their desired location. To accurately monitor a reservoir, the receivers in the streamers must be as close as possible to their previous positions. Therefore, it is desirable to know the currents in real time. Previous work has used the position and tension in a streamer to infer the currents. However, in many streamer systems, tension is not measured along the streamer. To overcome this problem, we propose that, by assuming that ocean currents are horizontally divergence-free, it should still be possible to reconstruct the currents from the positions of multiple streamers. Additionally, the previous work assumed that, when modelling a streamer, bending stiffness can be neglected. It is not clear that this assumption is correct when steering devices are attached; we therefore examine this assumption, using a novel finite difference scheme that incorporates bending stiffness, and conclude that it is safe to do so. Should such a method for inferring currents be implemented, the resulting information should not only be of value to the seismic industry, but also of use to oceanographers who wish to study submesoscale processes