地壳中流体动力学模型研究

较全面介绍了近年国内外地壳地下流体动力学研究的最新成果。综合分析前人研究成果并将其系统化为地完尺度上地下流体动力学系统的概念模型和数学模型。模型根据影响地下流体动力特性的主要因素和介质渗透特征,把地壳渗流场分为深度小于6km的饯部带、6～17km的过渡带和大于17km的深部带。数学处理上把驱动流体运动的各种地质作用归一化为“地质力”,以地下流体运动方程中的源汇项表示。分析了不同地质环境各种地质作用对地下流体系统的作用特征。对地壳中普遍存在的异常孔隙压力现象,从流体动力学的角度进行了解释,并认为周期性地震活动是形成异常高孔隙压力的主导因素。

A study of fluid dynamics model in the curst

The advanced results of subsurface fluid dynamics in the crust observed by various workers are introduced. Based on integrated and systematic analysis of these results, a conceptual model and its corresponding mathematical model are developed. In this model, the crustal seepage field was divided into three zones according to its permeability and dominant factors on which the fluid dynamic characteristics affect, that is shallow zone (0-6 km), transitional zone (6~17 km) and deeper zone (>17 km). The various driving forces on subsurface fluids were normalized as "geological force" and represented as sources or sinks in flow equation. The rates and magnitudes of diverse geologic processes are analyzed in different geologic environments. The widely occurred phenomenon in the crust, anomalous pore pressure, is explained from the viewpoint of subsurface fluid dynamics, and it is suggested that the periodic earthquakes is the dominant factor in forming the anomalous pore pressure process.