Wanghuaigouziqu Area Geological Characteristics And Enrichment Laws Of Oil Reservoirs Of Hydrology Research

WangHuaiziqu area islocated in the yanchang county of Shaanxi province YananCity in the eastern part of Erdos Basin in Northern Shaanxi Slope. Erdos basin is animportant for low permeable oil/gas exploration and development in China. Hydrogeochemical study of oil and gas accumulation is one of important methods which muchstudies of Enrichment laws of oil reservoirs. Although Wang Huaizi qu area is thedevelopment degree is low, the less basic data, so we need through The distributioncharacteristics of the chemical characteristics of oilfield water, Wang Huaizi ditch area ofgroundwater water, that study and calculate the area of oil and gas enrichment law. As thestudy area for future exploration and development to provide technical guidance.Osmotic water alternating slow and stagnant environment is the most favorable oiland gas accumulation and preservation conditions. However, the Filtration and diffusionmigration of oil and gas field water, the chemical properties of shallow water, diving, andeven surface water changed, and has some characteristics of oilfield water, This effect ismore likely to occur in the oil and gas reservoirs constructed on top and turning zone.Therefore, prediction of oil and gas accumulation regularity of this effect in the studyarea can be use of formation water chemistry data or oil water features.Through the research， it has a close relationship to save water chemical-composition and reservoir strata in the study area. The formation of chemicalcomposition of formation water and reservoir has the close relation and preservation, thetotal mineralization high value area of formation water(the Coefficient of sodiumchloride, the Desulphurization coefficient, the Carbonate equilibrium coefficient) and low value area all of that is Favorable for hydrocarbon accumulation and preservation. heformation water pH value between5.2-10.4, but most of the.pH value is greater than7.0.Individual depth section of well appeared in Na2SO4, CaCl2, MgCl2. Longitudinal haveincreased with depth, high formation water salinity. The Wanghuaizigouqu area is atypical litho logic reservoir. The correlation between wells found no unified boundarybetween gas and water, formation water many ion coefficient distribution is not uniform,the water very poor connectivity. Through the study found that the Wanghuaigouziquarea Yanchang formation water salinity value is high, small coefficient of sodiumchloride and desulphurization coefficient, formation water is sealed well, in a reducingenvironment is strong, which is beneficial to reservoir formation and preservation.