Salt kinematics and regional tectonics across a Permian gas field: a case study from East Frisia, NW Germany
Salt kinematics and regional tectonics across a Permian gas field: a case study from East Frisia, NW Germany
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二叠纪气田的盐运动学和区域构造：德国西北部东弗里西亚的案例研究
DOI：
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发表时间：
2013
影响因子：
2.3
通讯作者：
H. Stollhofen
中科院分区：
文献类型：
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作者：
A. A. Vackiner;P. Antrett;F. Strozyk;S. Back;P. Kukla;H. Stollhofen
这项研究重建了德国北部上罗特利根致密气田的构造历史。大研究区的构造运动受到多个阶段盐运动的影响，产生了各种与盐相关的结构特征，如盐墙、盐底辟以及盐冰川（namakiers）。使用连续的二维逆向变形和地层反向剥离方法来区分引起盐运动的机制并讨论它们与区域构造的关系。定量几何恢复包括沉积平衡、压实、与断层相关的变形、盐运动、热沉降和均衡，以揭示 Rotliegend 储层岩石的沉积后构造叠印。本研究结果表明，反应性盐底辟作用始于早三叠世的薄皮伸展构造时期，随后是晚三叠世的活跃底辟作用阶段，并有上覆盐穿透，最后是晚三叠世和侏罗纪强烈的盐表面挤压和盐冰川（纳玛基尔）形成时期。早白垩世以来，研究区盐分通过被动底辟作用不断上升。
This study presents a reconstruction of the tectonic history of an Upper Rotliegend tight gas field in Northern Germany. Tectonism of the greater study area was influenced by multiple phases of salt movement, which produced a variety of salt-related structural features such as salt walls, salt diapirs as well as salt glaciers (namakiers). A sequential 2D retro-deformation and stratal backstripping methodology was used to differentiate mechanisms inducing salt movement and to discuss their relation to regional tectonics. The quantitative geometric restoration included sedimentary balancing, decompaction, fault-related deformation, salt movement, thermal subsidence, and isostasy to unravel the post-depositional tectonic overprint of the Rotliegend reservoir rock. The results of this study indicate that reactive salt diapirism started during an Early Triassic interval of thin-skinned extensional tectonics, followed by an active diapirism stage with an overburden salt piercement in the Late Triassic, and finally a period of intensive salt surface extrusion and the formation of salt glaciers (namakiers) in Late Triassic and Jurassic times. Since the Early Cretaceous, salt in the study area has been rising by passive diapirism.