Abstract

Comparative analysis of three randomly chosen salt structures (diapir A, diapir B and diapir C) of the Southern North Sea has been presented through the interpretation and reconstruction of the 2D seismic data set (SNSTI-NL-87 & SNST-NL-83). The study area lies in the Southern North Sea, Dutch offshore and it was tectonically active in the Permian or prior to that, as the basement was faulted at several locations before the deposition of salt in the Late Permian. The salt started to move in the Late Triassic to the Early Jurassic and the resulting salt structures developed until the Mid-Miocene. In most of the cases salt started to move due to the basement faults but buoyancy and differential loading are also main factors for the initiation of the salt movement. Two main time periods are believed to enhance the salt movement in the study area i.e. the Late Jurassic to the Early Cretaceous (extension), and the Late Cretaceous to the Early Tertiary (inversion). The results show thick Triassic and Jurassic sediments in the graben area. In contrast, due to the possible erosion, thin layers of sediments observed on the structural highs. The Late Cretaceous was reported as the compressional period resulting thickness variations of sediments in the area.

中文翻译：

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北海南部，荷兰近海，荷兰的盐结构比较分析

摘要

通过解释和重建二维地震数据集（SNSTI-NL-87和SNST-NL-83），对北海南部三个随机选择的盐结构（diapir A，diapir B和diapir C）进行了对比分析。 。该研究区位于北荷兰南部，荷兰海上，它在二叠纪或之前是构造活动的，因为在二叠纪晚期沉积盐之前，几个地方的基底都是断裂的。盐在三叠纪晚期开始向侏罗纪早期移动，由此形成的盐结构一直发展到中新世中期。在大多数情况下，盐由于地下室断层而开始移动，但浮力和差异载荷也是引发盐移动的主要因素。据信，两个主要时期会增强研究区的盐分运动，即侏罗纪晚期至白垩纪早期（延伸）和白垩纪晚期至第三纪早期（反转）。结果表明，在grab陷区有厚厚的三叠纪和侏罗纪沉积物。相反，由于可能的侵蚀，在结构高处观测到薄薄的沉积物层。据报道，晚白垩世为压缩期，导致该地区沉积物的厚度变化。