Abstract:Spectral decomposition provides a novel means of utilizing seismic data and discrete Fourier transform(DFT) for imaging and mapping temporal bed thickness and geological discontinuities over large 3D seismic surveys.By transforming seismic data into frequency domain,processing and interpreting the tuning cube indicate lateral geologic discontinuities.This paper introduces reservoir prediction on upper Xiagou in Changshaling belt,Yinger depression with spectral decomposition.The frequency tuning range of thin sand is confirmed by tuning cube along the horizons.Delta sand body distribution and fan delta front sand body distribution are predicted to identify thin beds in practice and the predicted results coincide with the actual drilling data.Practical application results show spectral decomposition techniques are more accurate for thin sand bodies than the traditional full-band reservoir prediction.