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Seismic evidence for fluid migration and gas accumulation in sediment formation beneath the giant Storegga slide complex (Grip high 3D cube)

机译：巨型storegga滑动复合体（Grip高3D立方体）下方沉积物中流体迁移和气体聚集的地震证据

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摘要

The study area covers the northern sidewall of the Storegga slide located at the southern limit of the Vøring Plateau. The water depth at mid-Norwegian margin varies approximately between 500 and 1500m. The mid-Norwegian margin area has been known to be prone for submarine sliding and is therefore a key location for studying morphological features to improve our understanding of slide mechanisms. The master thesis aims to investigate fluid migration into the Naust formation from deeper reservoirs and its potential role in slope failure. The 3-D seismic dataset GH01 allowed mapping and visualizing of three slides at the northern sidewall of the Storegga slide. Fluid migration from deeper sources through polygonal and extensional faults and acoustic pipes, gives rise to fluid accumulations under impermeable glacigenic debris flow deposits within Naust formations. The role of fluid flow for slope failures is difficult to decipher. Acoustic pipes north of northern sidewall of the Storegga slide indicate focused fluid flow and a possible active fluid migration system. The layer-bound polygonal faults within Brygge and Kai formations and their extension to the lower Naust formation may be caused by rapid loading adding to the fluid migration pathways to the Naust formation. Thus migrated fluids have been documented to accumulate within the slide prone Naust formations. The three slides identified at the northern flank of the Storegga slide have their basal surface on the marine clays indicating the slope failure on marine deposits. Fluid flow is not considered solely responsible for slope failures but the presence of faults down to the headwall of each slide does support an important buildup of zones of weakness for fluid migration contributing to slope failure.
机译：研究区域覆盖位于沃林高原南端的Storegga滑坡的北侧壁。挪威中部边缘的水深大约在500至1500m之间。众所周知，挪威中部边缘地区容易发生海底滑动，因此是研究形态特征以增进我们对滑动机制理解的关键位置。硕士论文旨在研究流体从较深的油藏运入纳斯特地层的过程及其在边坡破坏中的潜在作用。 3-D地震数据集GH01允许在Storegga滑坡的北侧壁对三个滑坡进行映射和可视化。流体从较深的源头通过多边形和伸展断层以及声波管道的运移，在Naust地层内不可渗透的致冰川性泥石流沉积物下引起了流体聚集。流体流动对边坡破坏的作用很难被理解。 Storegga玻片北侧壁以北的声波管显示了集中的流体流动和可能的主动流体运移系统。在Brygge和Kai地层内的层状多边形断层及其延伸到较低的Naust地层可能是由于快速加载增加了通往Naust地层的流体运移路径而引起的。因此，已记录迁移的流体积聚在易于滑行的Naust地层内。在Storegga滑坡的北侧发现的三个滑坡的底面在海相粘土上，表明海相沉积物的边坡破坏。流体流动不仅仅被认为是造成边坡破坏的唯一原因，但是直到每个滑道的端壁的断层的存在确实支持了重要的薄弱区域的积聚，从而导致流体迁移而导致了边坡破坏。

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    Shrestha Krishna Kumar;

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  • 年度 2012
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  • 原文格式 PDF
  • 正文语种 eng
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