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《Journal of Yangtze University(Natural Science Edition)》 2011-02
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Research on N_2~1 Reservoir Heterogeneity in Wunan Oilfield

LI Jian-ming,LUO Dan(Yangtze University,Jingzhou 434023)MA li-ning,QU Xin-zhong(PetroChina Qinghai Oilfield Company,Dunhuang 736202)  
Wunan Oilfield N12 reservoir is mainly of silt deposition of delta front-offshore shallow lacustrine intrafacies,the reservoir has the characteristics of very low porosity and permeability.In this paper,the logging matter interpretation data of reservoirs and the core analysis data are used to investigate the intra-layer,inter-layer,planer heterogeneity of the N12 reservoir.The heterogeneity of intra-layer is closely related to sedimentary micro-facies.Permeability of single sand-layer in the vertical direction shows the priority of positive and reverse rhythm.The microfacies heterogeneity is weak in the order of underwater distributary channel,mouth bar,far sand barrier-sand sheet,dam nuclear,dam edge to sandy beach.The permeability of inter-layer is difference,Ⅰ,Ⅱoil formations have the strongest heterogeneity,the more single-layer,the stronger heterogeneity is.The reservoir changes are controlled by sedimentary facies,and plane permeability is varied considerably with rapid sand phase transition,poor connectivity.
【CateGory Index】: P618.13
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