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首页> 外文会议>ISRM Young Scholars Symposium on Rock Mechanics >Changes in Hydraulic,Electric and Mechanical Properties with Aperture Closure:Insight from Experimental and Numerical Approaches
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Changes in Hydraulic,Electric and Mechanical Properties with Aperture Closure:Insight from Experimental and Numerical Approaches

机译：具有孔径闭合的液压，电动和机械性能的变化：实验和数值方法的洞察力

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Hydraulic and mechanical behaviors of the geothermal reservoirs or the seismic faults are strongly controlled by the characteristics of rock fractures.To monitor and predict the hydraulic-mechanical coupling within the crust,geophysical explorations potentially are the powerful tools.However,there is few established rock physical model to link the hydraulic properties of fracture to the resistivity or elastic wave velocity.For our better interpretation of the exploration data,detailed investigation linking hydraulic properties to the mechanical/electric properties for the fractured rocks is required.Therefore,we explore the link by coupling the laboratory experiments and digital rock modeling on the fractures with different aperture distributions.We conduct the fluid-flow experiments and the numerical modeling on granite fractures.In our modeling,we first digitalized the real granite fractures by 0.1 mm grid system.Then,under the same condition with experiments,we calculate the fluid flow(Lattice Boltzmann Method)and resistivity/elastic wave velocity(finite-element method).Laboratory experiments show that fracture permeability decreases with increasing pressure,and this relationship could be reproduced in our modeling study.We further determine the aperture distributions based on the permeability matching approach.As a result,we successfully constrain the variation of permeability,resistivity and elastic wave velocity as well as fracture stiffness of the rock fracture against the pressure build-up;changes of permeability and resistivity are controlled by connection or disconnection of fluid-flow pathway whereas velocity and fracture stiffness are not.Our results suggest that the evolutions of permeability and flow area associated with aperture closure of fracture can be modeled by the changes of resistivity or fracture stiffness regardless of the roughness of the fracture.
机译：液压和热储或地震断层的机械行为强烈地受到岩石fractures.To监视器的特性控制和预测地壳内的液压 - 机械耦合，地球物理勘探潜在都是强大tools.However，有很少建立岩物理模型断裂的水力特性链接到的电阻率或弹性波velocity.For我们的勘探数据的更好的诠释，详查连接液压性能，机械/电气性能为裂隙含水层是required.Therefore，我们探索链接通过实验室实验和在具有不同孔径的骨折数字岩石建模耦合distributions.We进行流体流动试验和花岗石fractures.In我们的建模的数值模拟，我们首先数字化0.1毫米的网格system.Then真正花岗岩骨折与实验相同的条件下，我们计算流体F低（Lattice Boltzmann方法）和电阻率/弹性波速度（有限元法）。实验室实验表明，裂缝渗透率随着压力降低，并且这种关系可以在我们的建模再现study.We进一步基于所述孔径分布渗透性匹配approach.As结果，我们成功地限制透气性，电阻率和弹性波速度的变化以及对所述压力形成的岩石破裂的破裂刚度;渗透性和电阻率的变化是由流体连接或断开控制的-flow途径而速度和断裂刚度not.Our结果表明，渗透率的骨折的孔闭合相关联的演变和流动面积可通过电阻率或断裂刚度，而不管断裂的粗糙度的变化进行建模。

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