岩石断裂作用的反应-迁移-力学耦合与自组织

岩石断裂作用是一个复杂的动力学体系和动力学过程,受到岩石结构、应力、流体迁移、化学反应等多种地质因素和过程的耦合控制.本文建立了岩石断裂作用的反应-迁移-力学耦合动力学模型并编制了模拟程序.以湖南水口山康家湾矿区为例,数值模拟表明不同岩石的断裂作用强度和断裂渗透率演化是不同的,断裂与岩石、流体间的耦合产生正反馈和自组织作用,使得断裂渗透率的空间非均匀性增强并产生聚流作用.断裂与岩性、流体、反应的耦合、反馈与自组织作用控制了康家湾矿区流体成矿作用的发生与矿体的形成.

Reaction- Transport- Mechanical Coupling and Self- Organization in Rock Faulting

Rock faulting is a complex dynamic system controlled by the coupling of rock texture, stress, fluid flow, and reaction. A coupled reaction-transport-mechanical dynamic model for rock faulting is established and described. An example is presented for the Kangjiawan deposit, Shuikoushan, Hunan,China.The results of numerical simulation indicate that the faulting intensity and fracture permeability of different rocks are different, the coupling among faulting,rock and fluid can lead to feedback and self-organization which enhance the spatial heterogeneity of rock fracture permeability and facilitate fluid flow-focusing.The coupling,feedback and self-organization among faulting,rock ,fluid and reaction controlled the onset of fluid mineralization and the forming of ore bodies in Kangjiawan deposit.