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、热传递和质量输运是变形地质系统中的耦合过程。这些因素之间的耦合作用已被公认为在地震期间对逆冲断裂、成矿、变质作用和断裂的润滑具有重要作用。一个或多个耦合过程经常被简化或忽略。将开发一个完全耦合的数值模型，并将其应用于两种地质环境中的研究和物理相互作用过程：沉积盆地和吸积棱柱。作为新的特征，热质传输与构造变形耦合，水力渗透率被认为是应力和时间的函数，构造载荷被模拟为一个渐进过程而不是瞬时事件。本研究的主要目的有两个。第一种是构造一个通用模型来求解地质介质中的变形、流体流动、热传导和质量传输的耦合方程。第二个是应用该模型研究两个地质系统：一个是沉积前陆盆地，阿肯色州的阿科马盆地，另一个是增长棱柱，即巴巴多斯增长杂岩。这项研究将提高目前对构造演化史中流体中涉及热和质量传输过程的理解。在沉积盆地中的应用提供了构造事件、流体运移和成矿之间的定量联系。吸积棱镜的应用将有助于正在进行的解释海洋钻探计划中观察到的热和化学异常的努力。这项工作结合了分析尺度、数值模拟和案例研究。控制方程的标度分析确定了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、更真实的地质条件下的耦合过程提供了详细的解决方案。通用模拟将用于测试水文、机械和热力参数的敏感性。

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.