Swath-seismic mapping of European continental margins

欧洲大陆边缘的条带地震测绘

• 批准号: 5396463
• 负责人: Dr. Dirk Kläschen, since 8/2006
• 金额: --
• 依托单位: GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5396463?language=en
• 关键词: Swath; seismic; mapping; European; continental

We propose the development of "swath-seismics" using 9 parallel 9-channel streamers as an antenna to map out sub-surface geology at continental margins. As the width of each swath is approximately twice the water depth, the method can cover areas, several orders of magnitude more quickly than conventional mapping with grids of 2-D seismic lines or multistreamer near-vertical seismics. Targets include tilted fault blocks, serpentinite ridges, the tops of lava flows, the top of the giant Gibraltar Olistostrome and the Bottom Simulating Reflector. The BSR is associated gas, which occurs at the base of gas hydrates. The method should also be able to image and map fields of diapirs and mud volcanoes. The versatility of the method gives it widerspread and diverse application to European continental margins and their conjugates. Mapping of basement structure is particulary relevant for studies of rifting processes at both non-volcanic and volcanic continental margins. Mapping of BSRs and of mud volcanoes and other seeps and vents are essential for studying the fluid flow regime of the margin, and its linkages with the thermal regime, slope stability, neotectonics and gas hydrates. The proposal, thus, has relevance for all three main themes of the EUROMARGINS call for proposals.

我们建议发展“条带地震”，使用9个平行的9通道拖缆作为天线，绘制大陆边缘的地下地质图。由于每个条带的宽度大约是水深的两倍，该方法可以覆盖区域，比传统的二维地震测线网格或多流近垂直地震测图快几个数量级。目标包括倾斜的断块、蛇纹岩山脊、熔岩流的顶部、巨大的直布罗陀橄榄岩顶部和模拟反射器的底部。BSR是赋存于天然气水合物底部的伴生气。该方法还应该能够对底辟和泥火山的区域进行成像和绘制地图。这种方法的通用性使它在欧洲大陆边缘及其共轭地区得到了广泛的推广和不同的应用。绘制基底结构图对于研究非火山和火山大陆边缘的裂谷作用具有特别重要的意义。绘制BSR和泥火山以及其他渗漏和喷口的地图对于研究边缘的流体流动状况及其与热状况、斜坡稳定性、新构造和天然气水合物的联系至关重要。因此，该提案与EUROMARGINS征集提案的所有三个主要主题相关。