| In the system of hydrocarbon accumulation, as the drive and carrier, groundwater is very important in the process of oil-gas making, moving, collecting and dissipating. The hydrodynamic and hydrochemistry are among the factors which cause the physics and chemist characters of oil and gas to change. By the geochemistry analysis of hydrocarbon accumulation system, find out the genesis of oil-field water; conclude the geochemistry and geological function of hydrocarbon accumulation; by the research of palaeohydrodynamic field, estimate the moving aspect of oil-gas and the difference of gas-water, the relation with hydrocarbon accumulation.Geochemistry research of reservoir is the geochemistry reaearch of petroliferous basin. Applying the chemical component of groundwater to search the oil-gas bed and forecast hidden reservoir is one of contents of oil-gas geochemistry. Elements in groundwater under basin are commuting with that of oil-gas, because of the element moving, geochemistry make chemical component changed, the being of reservoir brings the element moving and homeostasis of chemical component in groundwater. By the research of chemical component in groundwater, distributing relation of oil and gas and advantaged area and structure with oil-gas can be forecasted.In the cause formation research of Xujiaweizi fault, using the method of experiment simulation and numerical simulation to research the screen method of verity value of each hydronium in groundwater. Mathematical physics model was based to deoxidize the method of groundwater in Xujiaweizi and verity value of each hydronium are obtained with this method, based the data-base of groundwater in Xujiaweizi fault. Origin of groundwater, supply area, release area and cause of formation were reaesrched with this method. By the analysis of datas of wells in Xujiaweizi fault, research the cause of formation of groundwater, connexity, characters of moving, accomplish fruit of this project successfully.
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