Distribution Characteristics of the Remaining Oil of Putaohua Oil Layer in Pubei Oil Field of Songliao Basin

Abstract

A comprehensive analysis has been made for the remaining oil of Putaohua oil layer in Pubei oil field of Songliao basin by using core and logging and dynamic data. It is considered that it’s distribution is controlled by positive structures, lateral fault seal, sedimentary microfacies and pattern matching of ‘fault-sand’. The forward fault trap and the top of internal micro-structures on the edge of fault block control the position of the enrichment of remaining oil; lateral fault seal affects the level of the enrichment of the remaining oil; the underwater distributary channel of shallow water delta and the main sheet sand constitute the remaining oil reservoir unit; pattern matching of fault and sand determines the rich layer of remaining oil. On the basis of the above study, four types of remaining oil has been established: fault edge screened type, top of micro-structures type, injection-production imperfection type and anisotropism of sheet sand. Different programs for different situations are proposed: inclined well for fault edge screened type, infilled straight well for top of micro-structures type, horizontal well for injection-production imperfection type, well fracturing for anisotropism sheet sand.