REWARE: a seismic processing algorithm to retrieve geological information from the water-column

IF 2.8 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geophysical Journal International Pub Date : 2024-09-07 DOI:10.1093/gji/ggae319
Romain Sylvain, Louise Watremez, Isabelle Thinon, Frank Chanier, Fabien Caroir, Virginie Gaullier
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Abstract

Summary When interpreting marine Very High-Resolution (VHR) single-channel seismic reflection data, the signal in the water-column is generally considered as noise and is often eliminated by a water-mute application to focus on geological information under the seafloor. Alternatively, the signal in the water-column can be used to study ocean currents or gas/fluid emissions. To provide images of the sedimentary formations and tectonic structures beneath the seafloor in shallow water regions, such as continental shelves and lakes, marine seismic reflection profiles are often acquired using a single-channel streamer and sparker-type source, providing VHR data, with limited penetration-depth. To exploit the full potential of these single-channel data, we propose a simple algorithm, called REWARE (Recovery of Water-column Acoustic Reflectors). This algorithm allows to extract further geological information from the water-column data using open-source codes (Seismic Un*x), adding the coherent signal from the previous shots, recorded in the water-column, to the previous traces. The record length becomes longer while maintaining a very high trace-to-trace consistency. To demonstrate its efficiency, we present two examples of the REWARE processing in two different geological contexts: the East Sardinia shelf (Italy) and the North Evia Gulf (Greece). This method provides deeper images than with original data for seismic data acquired across steep slopes, such as canyons or continental shelf breaks. Thus, depending on the seafloor geometry and sub-seafloor structures, it is possible to image or map sediment layers and tectonic structures at depth, keeping a very high structural resolution.
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REWARE:从水柱中获取地质信息的地震处理算法
摘要 在解释海洋甚高分辨率(VHR)单道地震反射数据时,水柱中的信号通常被视为噪声,通常通过水静音应用来消除,以集中研究海底地质信息。另外,水柱信号也可用于研究洋流或气体/流体排放。为了提供大陆架和湖泊等浅水区域海底沉积构造和构造结构的图像,通常使用单道流线型和火花型震源采集海洋地震反射剖面,提供穿透深度有限的 VHR 数据。为了充分挖掘这些单道数据的潜力,我们提出了一种名为 REWARE(水柱声反射体恢复)的简单算法。该算法允许使用开放源代码(Seismic Un*x)从水柱数据中提取更多地质信息,将水柱中记录的前几次拍摄的相干信号添加到之前的轨迹中。在保持轨迹间高度一致性的同时,记录长度变长。为了证明这种方法的效率,我们介绍了在两种不同地质背景下进行 REWARE 处理的两个例子:东撒丁岛大陆架(意大利)和北埃维亚湾(希腊)。对于穿越峡谷或大陆架断裂等陡峭斜坡采集的地震数据,该方法可提供比原始数据更深的图像。因此,根据海底几何形状和海底下结构,可以对沉积层和构造结构进行深层成像或绘图,并保持极高的结构分辨率。
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来源期刊
Geophysical Journal International
Geophysical Journal International 地学-地球化学与地球物理
CiteScore
5.40
自引率
10.70%
发文量
436
审稿时长
3.3 months
期刊介绍: Geophysical Journal International publishes top quality research papers, express letters, invited review papers and book reviews on all aspects of theoretical, computational, applied and observational geophysics.
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