THE INFLUENCE OF SEISMIC WAVELET PHASE ON REFLECTION COEFFICIENT INVERSION RESULTS

摘要

To research the influence of seismic wavelet phase on reflection coefficient inversion, an Autoregressive Moving Average (ARMA) model was used to describe the seismic wavelet, the wavelets with the same amplitude spectrum and different phase spectra were constructed by symmetrical mapping Pole-Zeros of the ARMA model in the z-domain, and spectrum division was used to implement reflection coefficient inversion. The theoretical analysis shows that a phase-only filter was remained after reflection coefficient inversion in the condition of inaccurate seismic wavelet phase estimation, and the phase spectrum of the phase-only filter was the phase spectrum difference between real wavelet and constructed wavelet. The realor accurate reflection coefficient sequences were identified in inversion results by the evaluation methods of Kurtosis and Variation. Simulation and actual seismic data processing results also verified the law of the wavelet phase influence on reflection coefficient inversion and the effectiveness of the evaluation methods. Research interest for enhancing the precision of reflection coefficient inversion results was indicated.