It has generally been considered that remaining oil forming in vertical is mainly controlled by permeability succession, the important effects of very thin lateral accretion mudstone (LAM) interbeds and permeability subsuccession have been neglected. By analyzing the sedimentary processes and efficiency of displacement oil (EDO) of point bar in P I 2 time unit, Daqing oilfield, point out that the 3-D architecture of point bar is the key of the forming and distribution of remaining oil (FDRO) and that many lunate-shape, oblique, very thin (<20cm thickness) LAMs in point bar are the most important barrier beds and permeability control-framework, and that lateral accretion sandstone body (LAS) is the basic and important unit of controlling spatial distribution of permeability in point bar, and set up the "3-D architecture of LAM+LAS+fluid density difference" model of FDRO.

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