Dynamic Permeability in Deformation & Fluid Flow in Accretionary Prisms

吸积棱柱中的ODP孔中的地球化学和热异常指示了幕式流体流动；远景钻探区的一些地震反射资料显示沿滑脱带的空间分离的大腿幅度反射，可能暗示了富流体扩张带。流体可能在流体-脉冲、错动、高渗透耦合系统中沿富泥断裂带流动。为了验证这一概念，该项目将对沉积物在变形过程中的动态渗透性或瞬时输送流体的能力进行初步实验研究。恒流率渗透仪耦合在一个三轴室中，将测量变形样品中恒定流动产生的压差。实验将在中等低围压的泥浆上进行，以模拟滑脱带或吸积棱柱脚趾附近可钻深度内的其他断层的条件。

Geochemical and thermal anomalies in ODP holes in accretionary prisms indicate episodic fluid flow; some seismic reflection data in prospective drilling areas show spatially separate, thigh-amplitude reflections along the decollement zone, perhaps suggestive of fluid rich dilatant zones. Fluids may flow along mud-rich fault zones in a coupled fluid-pulse, dislocation, high permeability system. In order to test this concept this project will conduct a pilot experimental study of dynamic permeability or the transient ability of sediments to transport fluids during deformation. A constant-flow rate permeameter coupled across a triaxial cell will measure pressure differences generated by constant flow within deforming samples. Experiments will be conducted on muds at moderately low confining pressures to simulate conditions in the decollement zone or other faults within drillable depths near the toe of the accretionary prism.