Abstract: Fourier spectrum decomposition technique is widely applied in plane and spacial description of carbonate reservoir in Tazhong area. The tuning amplitude, phase and discrete amplitude data from Fourier spectrum transform (FST) are applied to the fractured-vuggy reservoir description, fault or fracture system carving and reservoir hydrocarbon-bearing detection of Lianglitag formation of the Ordovician in TZ-45 Wellblock in Tazhong area, and good effects have been obtained.

Key words: Fourier spectrum transform, tuning cube, discrete cube, fault, hydrocarbon detection, TZ-45 Wellblock