The marine sector of the North German Basin and the Tornquist Zone: Structural evolution and fluid flow

北德盆地和托恩奎斯特区的海洋部分：构造演化和流体流动

• 批准号: 396852626
• 负责人: Professor Dr. Christian Hübscher
• 金额: --
• 依托单位: BGR-Dienstbereich Berlin
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/396852626?language=en
• 关键词: marine; sector; North; German; Basin

This project aims at reconstructing and understanding the structural evolution and related fluid expulsion in the marine sector (Baltic, Skagerrak and Kattegat) of the North German Basin and the most prominent and longest pre-Alpine tectonic lineament of Europe, the Tornquist Zone. The Tornquist Zone includes the Sorgenfrei-Tornquist and the Teisseyre-Tornquist Zones, both representing the transition area from the Precambrian Baltic Shield to the Caledonian-Variscan Europe.The major objectives are: 1) quantifying structural deformation since the Rotliegend to recent; 2) investigating ice-load induced tectonism; 3) re-assessing salt tectonics in the North German Basin; and 4) exploring sea floor directed fluid escape from Mesozoic and Paleozoic source and reservoir rocks.The related hypotheses are: 1) inversion tectonics lasts until today; 2) with the onset of glacial periods in the middle Pleistocene differential ice load induced tectonism reactivated inherited and created new fault systems, which partly pierce the present day seafloor; 3) gravity gliding was the dominant process that controlled salt deformation along the northern margin of the North German Basin; 4) that the petroleum system in the study area is partly leaky. The goals will be achieved by geophysical and geological methods. The unique core data set comprises ca. 2500 (out of 3500) km of reflection seismic data collected in 2016 with a 2700 km long streamer and eight GI-Guns as seismic source in the Baltic Sea. The short initial offset of 30 m allows for the very first time and in spite of the shallow water depth gapless subsurface imaging from Paleozoic strata up to the seafloor. Depth section with yet unparalleled resolution will be created, enabling us for an accurate fault slip analysis. Based on that we will restore balanced sections, which is necessary to unravel and quantify the mechanisms behind observed structural deformation. The tectono-stratigraphic evolution of the north-western end of the Tornquist Zone in the Skagerrak and Kattegat will be addressed by the integrated analyses of both ca. 1000 km of industrial and 3.200 km reflection seismic data collected during own research expeditions.We will interpret the new seismic data in the context of > 30.000 km of vintage data that image the upper kilometer only. Previous geophysical and geochemical studies provided compelling evidence that fluids escape on the seafloor origin from source and reservoir rocks. Fluid migration paths will be imaged and fluid and lithology properties will be distinguished by AVO-methods and other seismic attributes. We assume that our findings will be applicable also for the adjacent hinterland.

该项目旨在重建和了解北德盆地海洋部分（波罗的海、斯卡格拉克和卡特加特）以及欧洲最突出和最长的前阿尔卑斯构造线托恩奎斯特带的结构演化和相关流体排出。托恩奎斯特带包括索根弗雷-托恩奎斯特带和泰赛尔-托恩奎斯特带，两者都是前寒武纪波罗的海地盾到加里东-瓦里西亚欧洲的过渡区域。主要目标是：1）量化自Rotliegend以来的构造变形； 2）研究冰荷载引起的构造作用； 3）重新评估北德盆地的盐构造； 4）探索中生代和古生代烃源岩和储集岩中的海底定向流体逃逸。相关假说是：1）反转构造一直持续到今天； 2）随着中更新世冰川期的开始，差异性冰荷引起的构造作用重新激活，继承并创造了新的断层系统，部分刺穿当今的海底； 3）重力滑移是控制北德盆地北缘盐变形的主导过程； 4）研究区含油气系统存在部分泄漏。这些目标将通过地球物理和地质方法来实现。独特的核心数据集包括大约。 2016 年在波罗的海使用 2700 公里长的拖缆和八台 GI-Gun 作为震源收集了 2500 公里（共 3500 公里）反射地震数据。尽管水深较浅，但 30 m 的初始偏移量还是首次实现了从古生代地层到海底的无间隙地下成像。将创建具有无与伦比的分辨率的深度剖面，使我们能够进行准确的断层滑动分析。在此基础上，我们将恢复平衡截面，这对于揭示和量化观察到的结构变形背后的机制是必要的。斯卡格拉克海峡和卡特加特海峡托恩奎斯特带西北端的构造地层演化将通过对这两个地区约 2000 年的综合分析来解决。在自己的研究探险期间收集的 1000 公里工业数据和 3.200 公里反射地震数据。我们将在仅对上公里进行成像的 > 30.000 公里旧数据的背景下解释新的地震数据。先前的地球物理和地球化学研究提供了令人信服的证据，证明流体从源岩和储层岩石中在海底逸出。将对流体运移路径进行成像，并通过 AVO 方法和其他地震属性来区分流体和岩性特性。我们假设我们的研究结果也适用于邻近的腹地。