The Kinetics of Permeability Changes at Elevated Temperatures and Pressures

9316336埃文斯PI将进行实验，测量高温高压下饱水岩石的孔隙度和渗透率随时间的变化。破裂的岩石样品将被流体饱和，并在各种流体和围压的组合下加热到400-600摄氏度。将在水热处理之前、期间和之后测量渗透率。将进行广泛的微观结构分析，以了解发生的微观结构和孔几何形状的变化，包括测量裂纹长度、裂纹孔径和取向的平均值和分布。这种测量将显示孔隙空间的演变，并可以与自然样品和没有孔隙流体的热破裂样品的体视学测量进行比较。利用一种新的仪器，他将测量样品在水热条件下的渗透率随时间的变化。还将进行一些三轴加载的试验，以测试非静水压力的影响。****

9316336 Evans The PI will perform experiments to measure the change of porosity and permeability with time in rocks saturated with water at high temperature and pressure. Cracked rock samples will be saturated with fluid and heated to 400-600 C at various combinations of fluid and confining pressure. Permeability will be measured before, during and after the hydrothermal treatments. Extensive microstructural analyses will be performed to understand the changes of microstructure and pore geometry that occur, including measurements of mean values and distributions of crack length, crack aperture, and orientation. Such measurements will show the evolution of the pore space, and can be compared with stereological measurements of natural samples and samples that have been thermally cracked without pore fluids. With a new apparatus he will measure the evolution of the permeability with time while the samples are under hydrothermal conditions. Some experiments will also be done with triaxial loading to test the effects of non-hydrostatic stresses. ****