Quantitative Studies of Coupled Fluid Flow, Rock Deformation, Heat Transfer and Mass Transport in Deforming Geologic Systems

9418561 Ge流体流动、岩石变形、传热；在地质系统的变形过程中，质量输运是耦合过程。这些因素之间的耦合作用在逆冲断裂、成矿作用、变质作用和地震期间断层的润滑作用中具有重要意义。一个或多个耦合过程经常被简化或忽略。将建立一个完全耦合的数值模型，并应用于研究沉积盆地和增生棱镜两种地质环境下的物理相互作用过程。作为新的特征，热量和质量传递与构造变形耦合，水力渗透率被认为是应力和时间的函数，构造加载被模拟为一个渐进的过程而不是一个瞬时事件。这项研究有两个主要目的。首先，建立地质介质中变形、流体流动、传热和质量传递耦合方程的通用模型。第二个是应用该模型来研究两个地质系统：一个是沉积前陆盆地，即阿肯色州的阿科马盆地，另一个是增生三棱镜，即巴巴多斯增生复合体。这项研究将提高目前对构造演化史中流体中热量和质量输运过程的认识。在沉积盆地的应用提供了构造事件、流体运移和矿床沉积之间的定量联系。对吸积棱镜的应用将有助于解释海洋钻探项目中观测到的热化学异常现象。这项工作结合了分析缩放、数值模拟和案例研究。控制方程的标度分析确定了在简化条件下不同耦合机制的相对重要性。数值模拟为更复杂、更现实的地质条件下的耦合过程提供了详细的解。通用模拟将用于测试水文、机械和热参数的敏感性。

9418561 Ge Fluid flow, rock deformation , heat transfer, and ;mass transport are coupled processes in deforming geologic systems. The coupled effects among these factors have been recognized for their importance in thrust faulting, ore formation, metamorphism, and lubrication of faults during earthquakes. One or more of the coupling processes are often simplified or overlooked. A fully coupled numerical model will be developed and applied to study and physical interaction processes in two geologic settings: sedimentary basins and accretionary prisms. As new features, heat and mass transport are coupled with tectonic deformation, hydraulic permeability is considered a functions of stress and time, and tectonic loading is simulated as a gradual process rather than an instantaneous event. There are two main objectives of this study. The first is to construct a generic model to solve the coupled equations of deformation , fluid flow, heat transfer, and mass transport in geologic medial. The second is to apply the model to study two geologic systems: a sedimentary foreland basin, the Arkoma Basin in Arkansas, and an accretionary prism, the Barbados Accretionary Complex. This research will improve current understanding of the processes involving heat and mass transport in fluids during the history of the tectonic evolution. The application to the sedimentary basin provides a quantitative connection between tectonic events, fluid migration, and ore deposition. The application to the accretionary prism will contribute to the on- going efforts to explain the thermal and chemical anomalies observed in the Ocean Drilling Programs. The work combines analytical scaling, numerical modeling, and case studies. Scaling analysis of the governing equations identifies the relative importance of different coupling mechanisms under simplified conditions. The numerical modeling provides detail solution to the coupled processes under more complicated and realistic geologic conditions. The generic simulations will be designed to test sensitivities of hydrologic, mechanical, and thermal parameters.