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Hydrogeologic Features and Enrichment Laws of Oil Reservoirs in South Tianhuan Depression,Ordos Basin

HUI Xiao1,TIAN Yong-qiang2(1.Institute of Petroleum Exploration and Development,China Changqing Oillfield Company,Xi'an 710021, Shaanxi,China;2.Department of Exploration,Changqing Oilfield Company,Xi'an 710021,Shaanxi,China)  
Fluid migration,saving conditions and enrichment laws of oil reservoirs in South Tianhuan depression of Ordos basin are researched from the viewpoint of oilfield hydrogeology.Under the control of fault and ancient river erosion,the groundwater migrates from the centre of depression to the margin.The salinity analyses of oilfield water and mass concentration of chloride ions indicate that the sealing conditions of Yanchang Formation are better than Yan'an Formation.Areas with good sealing conditions,in which the oilfield water have high salinity and low values of deoxidizer coefficient,are favorable aims for oil exploration.
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