Fuyang reservoir has low porosity and ultra low permeability, with low producing degree of reserves. The developed proved reserves are extremely less than the undeveloped proved reserves in same area, and the scale of low producing well is increasing. 榆树林油田扶扬油层储层类型为低孔特低渗透储层,储量的动用程度很低,同一区块I类探明储量较Ⅲ类探明储量不仅大幅度减少,而且低效井比例增高。