ENRICHMENT REGULARITY OF Y-9 RESERVOIR IN CAOYAOXIAN AREA OF JINGBIAN OILFIELD, ORDOS BASIN

The enrichment of Y-9 reservoir in Caoyaoxian area of Jingbian Oilfield is studied by the overlaying analysis of geological condition and reservoir distribution based on the discussion of oil-water distribution characteristics and reservoir types. The results show that the Y-9 reservoir is chiefly distributed in the Y-9₂² layer vertically, with obvious edge and bottom water, dominated by structural and structural-lithologic composite reservoirs in terms of types. The enriched horizons and areas are controlled by the effective combination of distribution and scale of meandering stream sand body, culmination position of reservoir top, and thickness and distribution of direct caprock as well. In the eastern region, oil is the most abundant at the structural culmination where sand body is more than 10 m thick.