| The redbed is the land facies clastic rock deposit formed under the hot arid palaeo-climatology environmental conditions, its color is mainly red. The redbed mainly distributes in the southwest, Central China, South China and the Northwestern Region in China, the strata is of Mesozoic Era and Cainozoic Era. At Sichuan redbed basin distributed the Mesozoic Era Jurassic series and the Cretaceous system with red granulated substance, the mudstone, because it was widespread and has the complete sequence with thick deposition, Sichuan basin is one of the most representative redbed areas in China. Sichuan basin is also the main agroeconomics zone. In this area domestic water resources are relatively deficient, meteorological arid is frequent, production domestic water supply and demand contradictory is very prominent. In order to solve the water supply problem, the Sichuan people’s government and the Sichuan land resources department development department cooperated to implements "the redbed well-drilling for water project" in the Sichuan redbed area, over 17 city,105 county,118,000 square kilometers regions, drilling well 2,130,000 well, helped 7,926,000 people.Sichuan redbed area has been regarded as "the groundwater resources deficient area, the groundwater exist only in the lithology, the terrain landform, the geologic structure advantageous section", the redbed well in the shallow layer was developed on a small scale at present, no hydrochemistry study has been carried out. As "the redbed well-drilling for water project" developed shallow layer ground water in such a wide range scope, we acquired thousands control water sample analytical data. Analyses hydrochemistry characteristics based on the hydrogeochemistry research techniques would provide the hydrogeochemistry basis for the safety and sustainable use of the redbed well, increase the study level of redbed shallow layer ground water, provide a foundation hydrogeochemistry research technique for water analysis test data, offering the research method and appraisal procedure for for the water well drilling project at other redbed area.Based on the Sichuan redbed ground water investigation project and the development planning, this article carry out the hydrochemistry characteristic analysis, the formation mechanism research, the suitability appraisal of groundwater resources development engineering in Sichuan redbed area. According to the meteorology hydrology characteristic, the physical geography, the geological and hydrogeological conditions, and the shallow layer ground water type investigations in Sichuan redbed area, developed use space information system platform using MAPGIS and Access system. Take descriptive statistical analysis and the Piper graphical analysis method for the predominant type of the ground water, studied the main geological background in accordance with district or municipal administrative area, including the hydrochemistry ingredient characteristics, the spatial distribution rule, the constant ion, TDS, the hydrochemistry type and pH value, the degree of hardness of the shallow ground water, obtained the spatial distribution characteristic at the same time. Using the relevant analysis, the factorial analysis, the cluster analysis, the ion scale-up factor and the saturation index computation’s method, based on the predominant type of groundwater, studied the hydrochemistry characteristic and formation function in the main geological background district or in municipal administrative area. Analyzes the control action in geological environment using variance analysis method with hydrochemistry characteristics quantitatively, study whether the different geological condition affect the chemical composition characteristic or not. At last, appraised the suitability of groundwater resources development engineering in Sichuan redbed area.The main innovation research results of the paper are following:(1) Analyses hydrochemistry characteristics based on the hydrogeochemistry research techniques would provide the hydrogeochemistry basis for the safety and sustainable use of the redbed well, increase the study level of redbed shallow layer ground water, provide a foundation hydrogeochemistry research technique for water analysis test data, offering the research method and appraisal procedure for for the water well drilling project at other redbed area.The space information system, mathematical statistic method, the hydrogeochemistry method constitute a generalized analysis research system, it can be take into use for other redbed area as reference.(2) The results of statistical analysis of several thousand group of control water sample hydrochemistry ingredient test analytical data indicates the hydrochemistry characteristic and the distribution rule in Sichuan redbed, obtain the main anion distribution map; TDS distribution characteristic in horizontal direction and vertical direction; the distribution characteristic of hydrochemistry type(3) According to the mathematical statistic analysis, the Piper graphic, the ion proportionality coefficient and the saturation index, recognized the formation function of each kind of shallow ground water in Sichuan redbed area, the source of supply and the main influence factor, discovered that in the area the shallow ground water hydrochemistry type has the obvious regional characteristic, their characteristic is in accordance with the geological environment background, reflects the landform unit, the lothological facies are control factors to water chemical composition. Using factor variance analysis to various typical area’s formation lithology and the landform unit, recognized the zones of different geological environment condition to the ground water hydrochemistry characteristic quantitatively.(4) Based on the system research of the hydrochemistry ingredient characteristics and their distributions, as well as the formation function and the influencing factor analysis, appraised the suitability of the water resources development engineering. |
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