Seismic inversion involves converting a seismic section into an acoustic impedance section. In this presentation, three methods of seismic inversion techniques including LP sparse-spike, model-based and band-limited will be discussed to show the capability of each one in inverting 3-D seismic data for the reservoir under study. First, a zero phase wavelet was statistically extracted from the seismic data at the reservoir interval. Then, well logs to be used in the inversion process (sonic and density) were edited to eliminate spikes and noise bursts to avoid generation of spurious reflections. A synthetic seismogram was computed for each well using the well-driven reflection coefficients and the statistical zero phase wavelet. Good correlations were obtained between each synthetic seismogram and the seismic data at the well locations by squeezing-and-stretching the synthetic seismograms. Squeezing and stretching the synthetic seismogram in time domain is equal to phase rotation in frequency domain. It should also be noted that misunderstanding of the phase concept is the main cause of the error in seismic interpretation; hence the calibration process of the synthetic seismograms with the surface seismic should be carried out carefully. After the calibration stage, a nonzero<br>phase wavelet was extracted using the wells and seismic data and seismic data was inverted using this wavelet for all three methods. In comparison with other methods, the acoustic impedance resulted from the LP sparse-spike technique had the best correlation with the well-driven acoustic impedance. The total impedance correlation of this method was 0.846 over the whole field under study. The model-based method did not achieve good results, most likely because of the limited number of picked horizons in the reservoir interval. The results of the band-limited method were close to those of the LP method, as theoretically expected. Finally the LP sparsespike method was selected as the best one to invert the seismic cube.


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