COMPREHENSIVE EVALUATION OF HETEROGENEITY CONGLOMERATE RESERVOIRS——TAKING CONGLOMERATE RESERVOIRS IN QIZHONG AND QIDONG AREA OF KARAMAY OIL FIELD AS AN EXAMPLE

Conglomerate reservoirs in Qizhong and Qidong area of Karamay Oil Field are different from sandstone ones due to extra-high heterogeneity and complex mode pore structure.Influenced by piedmont pluvial phase,diagenetic compact and epigenetic diagenetic change,the reservoir is characterized by obviously different rock and mineral components,unequal grain sizes,great changes of facies horizontally and vertically as well as changes of permeability in or between layers.It is established in this paper comprehensive evaluation parameter,criterion and weighting coefficient by quantitative evaluation index system of stored energy parameter,reserves parameter,reserves distribution,scales,connectivity,drilling meeting ratio,permeability and heterogeneity.Comprehensive evaluation and classification description of heterogeneity conglomerate reservoirs are also made with gray system.Hence it is analyzed and illustrated from different aspects the quiescent quality of heterogeneity conglomerate reservoirs in this area.Conglomerate reservoirs with special microcosmic construction are studied macroscopically.Potential wells,layers and types for heterogeneity conglomerate reservoir development are pointed out,providing guild for oil field exploration.