Research On Reservoir Characteristics Of Yan 9 Oil-bearing Layer ?Fuxian Formation In Hujianshan Area,ordos Basin

The Jurassic Fuxian formation and Yan'an formation having the potential to increase oil & gas production in Hujianshan area of Ordos basin,now there is still a problem that the production result differs from the design scheme,which slows down the process of increasing reserves in this area.So,there should be a comprehensive and deep analysis of the macro and the micro reservoir characteristics of Yan 9 oil-bearing layer ~ Fuxian formation in Hujianshan area,which lays the foundation forrolling development reasonably and provides the basis for increasing production rapidly in the mean time.The research selects 399 wells in Hujianshan area to study Fuxian formation,Yan 10 and Yan 9 oil-bearing layers.By comprehensively utilizing of drilling data,logging data,core analysis,test data et al,and studying sand stretching law,reservoir petrology characteristics,reservoir physical property characteristics,reservoir micropore structure characteristics,diagenesis,reservoir heterogeneity characteristics et al,the the sisclears the basic characteristics of reservoir in Hujianshan area,on this basis,classifying and evaluating the reservoirof this area.The superface structure of members,which belong to Yan 9 oil-bearing layer ~ Fuxian formation inherit characteristics of monoclinal structure,from east to west,altitude gradually reducing,and structural nose with the background of monocline commonly exsiting.Fuxian and Yan 10 depositional periods mainly develop braid river deposition,microfacies mainly including channel,channel bar and alluvial flat.Yan 9 depositional period mainly develops delta deposition,microfacies mainly including distributary channel and interdistributary bay.By building property interpretation model of Yan 9 oil-bearing layer ~ Fuxian formation,the thesis clears the corresponding relationship between porosity and permeability,and calibrates the reservoir lower limit of Yan 9 oil-bearing layer ~ Fuxian formation.Arkose is the main lithology of reservoir in this area,and dissolution intergranular pore and residual intergranular pore are main pore types,the separation of pore and throat being medium.Porosity mainly distributes between 15% and 18%,and permeability mainly distributes between 1×10-3?m2 and 50×10-3?m2.Heterogeneity of reservoir in this area is strong,and diagenetic stage belongs to middle diagenetic stage(A stage).According to pore structure,pore and throat characteristics physical characteristics et al,the thesis formulates reservoir classification standard of Yan 9 oil-bearing layer ~ Fuxian formation in Hujianshan area,and the reservoirs are classified into four types.The main reservoir type of Yan 9 oil-bearing layer ~ Fuxian formation in this area is reservoir II,and reservoir I mainly exists in Yan 92+3 and Yan 102,which are the main oil production layers.