A STUDY ON CONGLOMERATE RESERVOIR HETEROGENEITY AND RESIDUAL OIL DISTRIBUTION OF MEMBER A3 IN MENGGULIN AREA OF THE ERLIAN BASIN

Based on dynamic and static information of conglomerate reservoirs in Menggulin area of the Erlian basin,a fine description of heterogeneity of the conglo merate reservoirs has been given.The conglomerate belonged to sediments of a braided river delta.The sedimentation and diagenesis controlled macro distribution of the reservoir,intra bed rhythm,the distribution of inter beds and change of porosity and permeability.The conglomerate was massive structured in the northwest and showed bedded structure in southwest area.It is showed that distribution of residual oil is controlled by sedimentary micro facies,structural condition,relationship of injection and production.Residual oil is concentrated in the high part of local structure,the oil zone of masive reservoirs and the upper part of bedded reservoirs between injection wells in higher water cut stage.The reservoirs of subaqueous channel micro facies with middle to low permeability showed low water driving efficiency,are the rich area of residual oil distribution.