///Taking the South-Two area for an example, under the guidance of the theory of reservoir architectural structure and sedimentology, comprehensively making use of the cores, logs and performance, adopting the hierarchy analysis, pattern guidance and performance verification methods, the authors have performed some quantitative research on the parameters of composite channel sandbodies, single point bar sandbodies and the lateral accretion bodies in point bars in South Two area, built a 3-D model of point bars. With the changes of seepage field and gravity, the effect of lateral accretion layer on remaining oil has been analyzed. Study shows that the point bar sandbodies in PⅠ