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《Acta Sedimentologica Sinica》 2006-01
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Oil/water Inversion and Its Genetic Mechanism in the Higher Portions of the Single Sandstone Body

ZHANG Xiao-li~(1,2)ZHA Ming~(1)WANG Peng~(2)(1.China University of Petroleum(East china),Dongying,Shandong237061;2.Key Laboratory for Continental Dynamics of the Ministry of Education,Department of Geology,Northwest University,Xi'an 710069)  
Complexand levityof geological conditions for forming oil reservoirs result inthe complexand levityof oil/water distribution,especially,in low permeability reservoirs.There have one kind of oil/water inversion in fault trap and lithologic oil reservoirs,that is,from the high portions of the single sandstone body to the low portions,they are water layer,water-bearing layer,oil-water layer,oil layer,oil-water layer,water-bearing layer,and water layer.According to analysis on the controlling factors of the oil/water inverted distribution in low permeability reservoirs,two kinds of genesis mechanisms were discussed.The results indicatethat there have two status.First,in faulttrap,the history diversityof the fault sealing is the key reason for the oil/water inverted distribution and physical properties of reservoir and permeability difference are the second reason.Second,in upward wedge out sandstone,physical properties of reservoir and its levity,especially,the heterogeneity of layer, are the key reasons for the oil/water inverted distribution.Meanwhile,The results indicatethat they include the low-resistivity pay zone in the oil/water inversion system.
【CateGory Index】: P618.13
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