摘要
The Hydrocarbon generation,migration,aggregation,saved and lost are in the environment of formation water or the participation of the formation water.The formation water movement is the hydrocarbon migration and accumulation of power and carrier.Its chemical composition,directly or indirectly reflects the environment and conditions for oil and gas accumulation.the Formation water and oil and gas in the process of geological history are interdependent and they constraint to each other.From the hydrogeological point of view to take advantage of the various chemical characteristics parameters of the formation water,as rNa+/rCl-ratios、(rSO42-×102) /rCl-ratios、(rHCO3-+ rCO32-) /rCa2+ ratios、rCl-/rMg2+ ratio and combined features.Analysis of the oil and gas storage conditions,the degree of closure of the strata,and oil and gas migration conditions,from chemistry characteristics of formation water is done,in order to master distribution of oil and gas reservoirs and look for favorable hydrocarbon accumulation zone.The stuldy shows that the formation water of Kalagang Formation in Santanghu Basin,with higher of salinity and rCl-/rMg2+ ratios,rNa+/rCl-ratios、(rSO42-×102)/rCl-ratios、(rHCO3-+ rCO32-)/rCa2+ ratio are lower.Salinity,the waterborne coefficient and water changes have good consistency.That hydrogeological conditions are favorable to the preservation of oil and gas in the area.The analysts believe that the formation water geological environment is stable and has the closed conditions in the slope zone,so it is conducive to hydrocarbon accumulation.