The Visualization Technology And Its Application For Of The Geochemical Methods In Underground Fluid Based On Matlab

The advance of the seismic study and the fluid object demands more support from thecomputer software technology. The geological information visualization can improve theability that people perceive on, understand and analyze the complex and abstract geologicalphenomena. In this paper, the visualization technology of fluid geochemistry built visualinterface by means of writing the daemon. The authors extracted geochemical methods, to bewidely applied to the groundwater and data analysis of fault gases, as a software development.Joining the PDETool to be used for numerical simulation on Radon migration enriched thetheoretical study of fault gases. In instance aspect, the applied research on visualizationsoftware was conducted three aspects of groundwater, fault gas measurement and numericalsimulation. The research results are summarized fellows.(1) Visual analysis system was consisted of two parts of the groundwater and fault gas.The main components in groundwater to be analyzed have K+, Na+, Ca2+, Mg2+, HCO3-, SO42-,Cl-, SiO2,2H (D),18O. Groundwater analysis interface mainly was consisted of five parts ofthe mixing model of hot and cold water, classification of water chemistry, the water cycle,hydrogen and oxygen isotopes and water-rock balanced. And each sub-interface was consistedof data processing, graphics rendering and graphics window. The objects of fault gas analysisin the interface are Mercury and Radon. This sub-interface was composed of two sub-sectionsof the application and theory (numerical simulation). The application section was the drawingwindow of concentration curves to analyze measured data of Mercury and Radon, and spaceanomaly maps to be used for field test. The application section to be based on PDE-tool wasnumerical simulation for Radon migration rule, the theoretical study of fault gas.(2)Authors developed the analysis software of the subsurface fluid based on Matlab, andcomparatively analyzed the chemical composition characteristics of hot spring water inWushan, Jiezi and Qingshui by using the software. In this paper, the types, water qualities,supply sources, the state of water-rock reaction and circulation depth of the water werediscussed. And the paper analyzed that the circulation depth of hot spring water impacted onthe seismicity of fault zone. The results show that all of the groundwater samples have thecharacteristics of atmosphere causes, water-rock reaction to achieve partial equilibrium andthe chemical composition controlled by surrounding rock. The hot spring water with shallowcirculation depth, in Wushan and Jiezi, are ‘Na-HCO3·SO4·Cl’ of hydrochemical type and theearthquake activities is frequent in the local fault. But,the water in the Qingshui hot spring hasdeep circulation depth and the local faults have the weak earthquake activities; thehydrochemical type of the water is Na-SO4·Cl.(3)In this paper, the authors analyze and process for measurement data of fault gas, inHezuo Q3thrusts and the northern margin of West Qinling fault, and draw the curve ofmercury and radon, which were based on Visual interface. All measuring line of mercury andradon had the phenomenon that single-point or multi-point anomalies synchronously or quasi-synchronously appear. The curve anomalies of measuring line in Hezuo appeared thesecharacteristics of multimodal and the jagged shape, wider abnormal section, and reflected theproperty of the thrust faults with low dip-angle. In the northern margin of West Qinling fault,the measuring line appeared these characteristics of less number of abnormal peaks, narrowabnormal sections, and reflected the property of the strike-slip faults wit h high dip-angle.According to the comparative study of soil gas anomaly intensity, the fault activity can beinitially confirmed. The faults of Huang Xianggou, Zhangxian and Wushan with higheranomaly intensity of soil gases had strong activity. The faults of Tianshui, Guo Matan withlower anomaly intensity of soil gases had weak activity. The order of activity intensity aboutthis five faults is Wushan> Zhangxian> Huang Xianggou> Tianshui> Guo Matan.(4)Based on two-dimensional partial differential equations and corresponding boundary conditions of radon migration that the predecessors had put forward, this paper built threephysical models of the overburden: the internal fracture, the fracture system-fault zone andnon-homogeneous; applied PDEtool and common function (pdenonlin), in Matlab platform,to solving the model and simulating radon migration in the overburden inside. By analyzingthe simulation results of three models, this paper explained that the radon anomaly points inoverburden surface were inconformity with the fault location, the thickness of overburdenimpacted on the shape of the concentration curve, and the soil structural property affected onthe strength and shape of radon anomaly.The analysis results of application showed that the visualization analysis system ofgeochemical method on underground fluid is a high professional technical, user-friendly,flexible and easy maintenance. The system,with good application prospects, brought togethermature technology achievements that precursors studied on the underground fluid applied inseismology and provided important technical support for the earthquake precursor observationand the basic research of subsurface fluid.