REMAINING OIL, DISTRIBUTION AT HIGH WATER-CUT STAGE IN RIVER FACIES RESERVOIR OF SAERTU OIL FIELD
PED, 1997, 24 (4 ): 51-53Zhou Qi (Qinhuangdao Branch of Daqing Petrtoleum Institute, Hebei, 066004)
The river facies reservoir in PI Formation of Saertu oil field is very heterogeneous. There are still significant amount of oil remained in it even at the late high water-cut production stage. The feature and combination of micro-facies deposits are the main factors determining the heterogeneity of sand bodies, and the fundamental reason causing large amount of oil remaining in situ. The distribution pattern of remaining oil in highly meandered stream deposits is consistent with the distribution variation of the lateral accretion bodies, and takes a ring-like zone created by the lateral accretion layer and the abandoned channel. The remaining oil is normally enriched in the outer most abandoned channel and the lower part of point bar,especially the point bar badly connected with water-flooded sand bodies. The fast water break through along the main flow streamlines of the lowly meandered channel and the straight channel resulted in a discontinuous remaining oil enrichment region in the edge of the river.
【CateGory Index】： TE32