Abstract: Permian Changxing reefs and Triassic Feixianguan oolitic beach in Longgang district is potential bank reef reservoir.
According to the reservoir characteristics，they are divided into four types：Fei3—Fei1 upper limestone porosity reservoir，
Fei3—Fei1 middle dolomite dissolved pore reservoir，Changxin limestone porosity reservoir，and Changxin dolomite cavern
or fracture-cavern reservoir. We comprehensively evaluate the effectiveness of these reservoirs by means of thin slice，mercury
penetration，MDT，FMI，Stoneley wave and other methods. The study shows that the effectiveness of Changxin dolomite
cavern or fracture-cavern reservoir is the best，and second best is Fei3—Fei1 middle dolomite dissolved pore reservoir. The
effectiveness of Fei3—Fei1 upper limestone porosity reservoir and Changxin limestone porosity reservoir is poor，which is not
likely to have become industrial capacity.

Key words: bank reef reservoir, effectiveness evaluation, mercury penetration, MDT, FMI, Stoneley wave