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首页> 外文期刊>Tectonics >Coupled fluid flow and sediment deformation in margin-scale salt-tectonic systems: 2. Layered sediment models and application to the northwestern Gulf of Mexico
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Coupled fluid flow and sediment deformation in margin-scale salt-tectonic systems: 2. Layered sediment models and application to the northwestern Gulf of Mexico

机译：边缘尺度盐构造系统中的流体流动和沉积物变形耦合：2.分层沉积物模型及其在墨西哥西北海湾的应用

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摘要

In paper 1 we described a methodology to model coupled fluid flow and deformation in composite salt and siliciclastic tectonic systems and investigated their compaction and overpressuring behavior prior to and during continental margin-scale gravitational spreading. Compaction-driven Darcy fluid flow in clastic sediments is coupled through the effective pressure to their frictional-plastic yield and mechanical deformation. Viscous flow of the underlying salt is independent of fluid pressure. Paper 1 presented prototype models that are limited to single uniform sediment lithologies, either sandstone-type or shale-type, that undergo mechanical and volumetric viscous compaction. In this paper we present models with layered sandstone-type and shale-type lithologies designed to better approximate the more complex stratigraphy of the Gulf of Mexico, our natural example. A first set of models demonstrates that layered lithologies can produce fluid pressure regimes similar to those observed in sedimentary basins. We then introduce an improved formulation of viscous compaction that includes a stronger dependence on porosity and depth (used as proxy for temperature), thereby more effectively self-limiting viscous compaction. A second set of models with the improved viscous compaction formulation demonstrates that the onset of gravity spreading is mainly controlled by overpressuring in the landward end of the salt basin and that resulting shortening in the distal part is partly accommodated by horizontal compaction. Models with moderately high fluid pressure best reproduce conditions considered to have been necessary for large-scale gravitational spreading in the northwestern Gulf of Mexico, which led to the formation of the Perdido Fold Belt.
机译：在论文1中，我们描述了一种方法，用于对复合盐和硅质碎屑构造体系中的流体流动和变形耦合进行建模，并研究了大陆边缘尺度重力扩展之前和期间的压实和超压行为。压实作用驱动的达西流体在碎屑沉积物中的流动通过有效压力与它们的摩擦塑性屈服和机械变形耦合。底层盐的粘性流与流体压力无关。论文1提出了原型模型，这些模型仅限于经历机械和体积粘性压实的单一均匀沉积物岩性，无论是砂岩型还是页岩型。在本文中，我们提出了具有分层砂岩型和页岩型岩性的模型，这些模型旨在更好地近似墨西哥湾（我们的自然实例）的更为复杂的地层。第一组模型表明，层状岩性可以产生类似于沉积盆地中观察到的流体压力状态。然后，我们介绍了一种改进的粘性压实配方，其中包括对孔隙率和深度的依赖性更大（用作温度的代表），从而更有效地自我限制了粘性压实。具有改进的粘性压实配方的第二组模型表明，重力扩展的开始主要是通过盐池陆端的过压来控制的，而导致远端部分变短的部分原因是水平压实。具有中等较高流体压力的模型具有最佳再现条件，被认为是墨西哥湾西北部大规模重力扩散所必需的，从而导致了Perdido褶皱带的形成。

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  • 来源
    《Tectonics》 |2012年第4期|p.TC4011.1-TC4011.22|共22页
  • 作者

    Sofie Gradmann; Christopher Beaumont;

  • 作者单位

    Department of Earth Sciences, Dalhousie University, Halifax, Nova Scotia, Canada,Geological Survey of Norway, Trondheim, Norway, Department of Earth Sciences, Dalhousie University, 1459 Oxford St., Halifax, NS B3H4R2, Canada;

    Department of Oceanography, Dalhousie University, Halifax, Nova Scotia, Canada;

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