Abstract: The weighting method is taken to conduct the reservoir appraisement of the second sand bodies of the fourth member of Shahejie formation of fault block 81 in Dongpu depression.First, to choose effective thickness, porosity, permeability, oil saturation and shale content as the appraisal parameters; Then to normalize the parameters according to the maximum value;
Next to calculate the comprehensive appraisal point according to the individual appraisal point and its relevant weight coefficient; Last to classify the reservoir. The appraisal results are as follows: Type I: the fifth sand body of the second sand bodies of the fourth member of Shahejie formation; Type II: the first,second, third and fourth sand body of the second sand bodies of
the fourth member of Shahejie formation. Furthermore, the volumetric method is taken to calculate the oil reserves of the second sand bodies of the fourth member of Shahejie formation of Fault block 81. The research above lays a foundation for the next project setting of oil production.

Key words: Dongpu depression, weighting method, reser-voir appraisement, calculation of reserves