海上疏松砂岩井间优势通道识别与表征方法OA北大核心CSTPCD

Based on the inter-well connectivity theory,taking into account the degree and proportion of permeability difference of inter-well connectivity unit,a permeability non-uniformity coefficient was proposed and established,achieving quantitative characterization of dominant inter-well connectivity units.A classification standard for inter-well dominant connectivity units was established based on mod-el analysis and actual oilfield data.This method was applied to the Bohai S unconsolidated sandstone oilfield.The result shows that as the permeability non-uniformity coefficient increases,the cumulative oil production continues to decrease,the water-free oil recovery pe-riod continues to shorten,and the phenomenon of uneven injection intensifies.When the permeability non-uniformity coefficient is grea-ter than 3,the single direction component of the injection well can reach 70％,corresponding to a 75％reduction in the water-free oil recovery period of the production well.The difference between the calculated permeability of the actual block and the tracer interpreta-tion permeability is 4.5％,and the calculated permeability is consistent with the oilfield dynamic test result.Dominant connectivity units P07-P01,P07-P08 and P09-P04 in the study block were selected as subsequent profile-control plugging targets.