Petrophysical Experiments Of Polymetallic Deposit And Numerical Modeling For Hydrothermal Mineralization, Songxian, Henan

This paper use the petrophysical experiments to study of polymetallic deposit in the Songxian, Henan Province, China. The permeability and porosity is an important criterion for test the transportation capability of rock. Using numerical modeling of pore-fluid flow, heat transfer and mineralization in the Songxian polymetallic deposit district.Permeability is an important controlling parameter of fluid flow systems at depth. The hydrothermal activity and transportation is determined by the permeability of fault zone. Quantification of fluid transport through fault zones is critical for the prediction of the scale of the ore deposits, the duration for mineralization and the.depth of the deposits. Therefore, study of permeability of fault zone and the permeability of the host rock is very useful for built the model of ore deposits process. This paper show that the method of measure permeability and principals of the calculation of permeability. And it introduce the processes of measurement with the distilled water/gas-medium permeability measurement apparatus. Using the experiments result to modeling of ore deposit is more reliable than other parameter.The fault zone with high porosity is also important for the hydrothermal ore deposit. The metallogenic belt always occur with fault zone that is not only because the fluid is easily to transport in the fault zone, the fault zone with high porosity has enough space for ore-forming fluid to precipitation. In a long period time of mineralization, the processes may stop for the decease of porosity. So, it is significant for us to study the porosity, density and other petrophysical parameters of fault zone. The paper show the relationship with porosity, density and pressure. It provides a new approach to measure total pores as the function of pressure. The total pores can be divided into two portions, compliant pores and framework ones. The former is fully closed at the pressure Pcp-"closure pressure of compliant pore" and the latter can survivein specimens even when pressure reaches600MPa.. And it discuss the effect of porosity of fault zone on the pore fluid flow.Since mineralization may last a long period of time in hydrothermal system, it is commonly assumed, in geochemistry, that the solutions and minerals are in an equilibrium state. The relationship between the equilibrium concentration of Au and temperature has been considered to determine the mineralization rate of gold ore. Using the COMSOL Software, the coupled pore-fluid flow, heat transfer and mineralization have been simulated and used to analyze the precipitation pattern of gold deposit.