The Simulation Research Of Interlayered Oxidized Zone Sand Type Uranium Deposit's Mineralization Geological Condition

Sandstone type uranium deposit becomes the mostly distributed uranium deposit in the world because of the development of in-situ leaching technique and widely distributed. The in-depth study of sandstone-type uranium deposit's mineralization is significant in guiding the exploration of mine and mine's predication. In this thesis, based on the theory of water into uranium, the advantageous minerogenetic condition of interlayer Oxidation Zone sandstone type uranium deposit was summarized and analyzed by GMS software construct ore-forming geological entity model, flow movement model, solute migration model. The author tires to research the impact of sandstone formation, coefficient of permeability and porosity on water movement model and two important hydrogeological parameter's sensitivity analysis; propose solutions about the water current movement model and the analogy method of Mont carol; research the uranium element's movement in solute migration model with difference injection types.Water into uranium theory values the relationship between infiltration type artesian basin and the uranium's mineralization; emphasis on the water head difference between basin's ground water supplying region and discharging area which provides a good hydrodynamic condition for uranium migration. The atmospheric precipitation-based flowing water dissolves the rocks of provenance area and brings uranium elements into the metallogenic rock. This process is the main source for uranium elements. When oxygen-bearing U rich doing the osmosis migration in the good penetrative sandstone layer, the interlayer oxidation zone is formed. According to the rocks' oxidation degree, rock stratum can be divided into oxidizing zone, transitional zone and the sandstones reduction zone. Based on the above-mentioned uranium ore-formation, we can find that the position of sandstone type uranium deposits in interlayer oxidation zone has special requirements for ground water dynamic conditions(including the velocity of flow, hydraulic slope, porosity, permeability coefficient, anisotropism, metallogenic system and runoff discharge conditions).GMS system colligates Modflow, MT3 DMS, FEMWATER and other three-dimensional simulation module for the groundwater. In this thesis, the author combines GMS software's advantage in numerical simulation of groundwater flow with water into uranium theory to build a generalized model for favorable metallogenic conditions:(1) Build the altitude data for different layers and construct the geological entity model eventually by using the elevation data model and Borehole module;(2) Use 3Dgrid direct model to construct the interlayer oxidation zone sandstone type uranium deposit's water movement model;(3) Use MT3 DMS to build the Metallogenic solute migration model based on the flow field simulation. The author Study the relationship between different hydrogeological condition and its impact on the water movement of interlayer oxidation zone sandstone type uranium deposit, and the influence of parameter change on the migration of uranium mineralization by adjusting the parameter and changing the initial condition. Considering the research area's hydrogeological conditions, the author proposed a plan that we can use GMS's Monte Carlo Simulation to study the random character of sandstone bed's groundwater flow.During the actual deposit research, we can generalize and reveal the specific stratum situation of the interlayer oxidation zone sandstone type uranium deposit model by using Borehole's visual display in bore and profile. Analyze the role of two hydrogeological parameters(osmotic coefficient and porosity) in interstratified oxidized zone type sandstone uranium deposit's ore-formation by compare the arrival time of tagged partical in pressure reduced capture area. Then reach the conclusion that interstratified oxidized zone type sandstone uranium deposit model has high sensitivity in osmotic coefficient and osmotic coefficient overwhelms the porosity during the process. By studying the pervasion and transference which was injected in difference ways into interstratified oxidized zone type sandstone layer, we found that the distance of uranium migration has positive correlation with the ability of groundwater flow movement. Meanwhile, the size of diffusion area of uranium has positive correlation with the size of uranium source supply area and the alter dispersion parameter.