Accumulation Distribution Characteristics And Controlling Factors Of Chang2 Reservoir In A Area Of Panlong Oilfield

Ordos Basin is the largest base for low permeable oil/gas exploration in China.The low permeable oil/gas accumulation in Ordos Basin featured with poor physical property,s trong heterogeneity and complex factors controlling oil/gas accumulation and distribution.Panlong oilfield is located in the east of ShanBei incline in Ordos Basin,The Chang2 oil layers in this area put up in a extremely low porosity and permeability way,and mainlydeveloped three kinds of sedimentary microfacies:including channel mouth bar,stream wa-y flank and levee,with a NE�SW watercourse orientation.Chang2 oil layers are mainly constitute by structure �lithology hydrocarbon reservoir.Concentration the oil are controlled by properties of matter,lithology and some other factor.Be guided by the theories of petroleum geology,structural geology,sedimentology,geo p-hisics and petroleum geology,Oil field development geology,this is conducts a intensive study on the distributions of sand-bodies and oil-reservoirs in Chang2~1,Chang2~2,Chang2~3 oil-bearing formation.On the basis of that,this thesis then further explores controllings from tectonics,sand-bodies distribution and reservoir-heterogeneity to the oil distribution.Studies have shown that the formation of Chang2 oil layers in Panlong oilfield are contr-olled by Sedimentary faces belt,nose-shaped uplifts and reservoir heterogeneity,the nose-shaped uplifts make a great contribution for the oil distribution,and this study area shows a strong reservoir heterogeneity,In addition,inter layer also have a big effect to the oil distribution,on the one hand impede interstitial flow of the oil in horizontal-vertical direction.On the other hand,however,they sometimes function as cap formation to in fa vor of preserving the dissipation of the oil.