Based on the hybrid hypersingular integral equation-lattice Boltzmann methods (HHIE-LBM), the porosity and permeability evolution and evaluation process in anisotropic saturated porosity multiscale-multiphase-multicom...Based on the hybrid hypersingular integral equation-lattice Boltzmann methods (HHIE-LBM), the porosity and permeability evolution and evaluation process in anisotropic saturated porosity multiscale-multiphase-multicomponent (ASP-MS-MP-MC) structures under ultra high temperature and pressure conditions was analyzed on parallel CPU and GPU platforms. First, virtual physical models at multi-spatial scales (2 μm, 5 μm and 10 μm) were restructured by computerized microtomography technology and data. Second, using HHIE-LBM methods, the anisotropic porosity and permeability tensor at core level and pore level under ultra high temperature and pressure conditions were calculated. Third, the evolution and evaluation process of the porosity and permeability as a function of multi temporal spatial scales was investigated. Finally, the relationship between porosity and permeability and ASP-MS-MP-MC structures (micro-meso-macro-scale) was explored.展开更多
We used twodimensional numerical simulations to investigate smallscale convection in the upper mantlelithosphere system with depth and temperaturedependent viscosity. Our aim was to examine the mechanism of craton thi...We used twodimensional numerical simulations to investigate smallscale convection in the upper mantlelithosphere system with depth and temperaturedependent viscosity. Our aim was to examine the mechanism of craton thinning by thermal con vection. The model domain is 700 km deep and 700 km wide with a resolution of 71x71 nodes and 160000 markers. The ve locity boundary conditions are freeslip along all the boundaries. A thermal insulation condition was applied at the two side walls, with constant temperatures for the top and bottom boundaries. We assumed an initial temperature of 273 K at the upper boundary and 1673 K at the lower boundary, and 1573 K at the bottom of the lithosphere （200 km depth） for the thick, cold, and stable North China Craton （NCC）. We calculated the thermal evolution in the upper mantle when the temperature at its bottom is raised because of lower mantle convection or plumes. The temperature at the bottom of the upper mantle was set at 1773, 1873, 1973, and 2073 K for different models to study the temperature effect on the lithospheric thinning processes. Our endmember calculations show that with the bottom boundary raising the lithosphere can be thinned from a depth of 200 km to a depth of between 100 and 126.25 km. The thinning rates are at mm/y order of magnitude, and the thinning timescale is about 10 Ma.展开更多
基金supported by the Project SinoProbe-07 of Chinathe National Natural Science Foundation of China(D0408/4097409),the Key Important Project of the National Natural Science Foundation of China(10734070)+1 种基金the First Class Foundation of Graduate University of the Chinese Academy of Sciences(Y15101KY00)the Knowledge Innovation Program of the Chinese Academy of Sciences(KJCX2-YW-N42)
文摘Based on the hybrid hypersingular integral equation-lattice Boltzmann methods (HHIE-LBM), the porosity and permeability evolution and evaluation process in anisotropic saturated porosity multiscale-multiphase-multicomponent (ASP-MS-MP-MC) structures under ultra high temperature and pressure conditions was analyzed on parallel CPU and GPU platforms. First, virtual physical models at multi-spatial scales (2 μm, 5 μm and 10 μm) were restructured by computerized microtomography technology and data. Second, using HHIE-LBM methods, the anisotropic porosity and permeability tensor at core level and pore level under ultra high temperature and pressure conditions were calculated. Third, the evolution and evaluation process of the porosity and permeability as a function of multi temporal spatial scales was investigated. Finally, the relationship between porosity and permeability and ASP-MS-MP-MC structures (micro-meso-macro-scale) was explored.
基金financially supported by the National Natural Science Foundation of China (Grant Nos. 90814014 & 40971226)Sino-Probe 09-03 (YOQ0360032)Sino-Probe 07
文摘We used twodimensional numerical simulations to investigate smallscale convection in the upper mantlelithosphere system with depth and temperaturedependent viscosity. Our aim was to examine the mechanism of craton thinning by thermal con vection. The model domain is 700 km deep and 700 km wide with a resolution of 71x71 nodes and 160000 markers. The ve locity boundary conditions are freeslip along all the boundaries. A thermal insulation condition was applied at the two side walls, with constant temperatures for the top and bottom boundaries. We assumed an initial temperature of 273 K at the upper boundary and 1673 K at the lower boundary, and 1573 K at the bottom of the lithosphere （200 km depth） for the thick, cold, and stable North China Craton （NCC）. We calculated the thermal evolution in the upper mantle when the temperature at its bottom is raised because of lower mantle convection or plumes. The temperature at the bottom of the upper mantle was set at 1773, 1873, 1973, and 2073 K for different models to study the temperature effect on the lithospheric thinning processes. Our endmember calculations show that with the bottom boundary raising the lithosphere can be thinned from a depth of 200 km to a depth of between 100 and 126.25 km. The thinning rates are at mm/y order of magnitude, and the thinning timescale is about 10 Ma.
