Sub-seismic deformation on different scales in the North German Basin

北德盆地不同尺度的次震形变

• 批准号: 5426818
• 负责人: Professor Dr. Reinhard Gaupp
• 金额: --
• 依托单位: Sektion 2.2: Geophysikalische Abbildung des Untergrunds
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5426818?language=en
• 关键词: Sub; seismic; deformation; different; scales

The evolution of a sedimentary basin is most particularly affected by deformation. Largescale, subsurface deformation is typically identified by the interpretation of seismic data and evaluated by palinspastic reconstruction. These studies also show, however, that sub-seismic small-scale fractures play a significant role: they may accomodate a significant proportion of the total strain (up to 50%) during basin evolution, laterial variation may cause compartmentalised deposits and reservoirs, and fracture networks may act as conduits for diagenetic fluids. In the Northgerman Basin these virtually unknown aspects require an analysis of location, orientation and length distribution of the fracture systems with different methods for determining a) the magnitude of deformation, b) the strain accumulation in space and time, and c) the processes that control a) and b) during basin evolution under varying kinematic constraints. To address these topics, our study aims to 1) quantify and predict areas of high- or low-strain accumulation in the NGB with seismic interpretation and 3D retro-deformation, 2) validate these predictions with fractal analysis of fracture systems and calibration with drill hole and sample data, and 3) compare observed and predicted strain patterns with those from scaled analogue experiments to unravel the relationship at different scale lengths within structures representative of units in the NGB. For this purpose we have chosen the Völkersen area where both appropriate well and 3D seismic data from oil industry are available.

沉积盆地的演化最受变形的影响。大范围的地下变形通常通过地震资料的解释来识别，并通过古构造重建来评价。然而，这些研究也表明，次地震小规模裂缝发挥了重要作用：在盆地演化过程中，它们可能容纳了相当大比例的总应变(高达50%)，侧向变化可能导致区域化的沉积和储集层，裂缝网络可能充当成岩流体的管道。在Northgerman盆地，这些几乎未知的方面需要用不同的方法来分析断裂系统的位置、方位和长度分布，以确定a)形变的大小，b)应变在空间和时间上的累积，c)在不同的运动约束下控制a)和b)盆地演化的过程。为了解决这些问题，我们的研究旨在1)通过地震解释和3D逆变形来量化和预测NGB中高或低应变聚集区，2)用裂缝系统的分形分析和钻孔和样品数据校准来验证这些预测，3)将观测和预测的应变模式与规模模拟实验中的应变模式进行比较，以揭示代表NGB单元的构造在不同尺度长度上的关系。为此，我们选择了Völkersen地区，在那里可以获得来自石油行业的合适的井和3D地震数据。