IMPULSE RESPONSE MODELS FOR NOISY VIBROSEIS DATA*

Authors


  • Registered trademark of Continental Oil Company.

  • *

    Revised version of a paper read at the Fortieth meeting of the European Association of Exploration Geophysicists, Dublin, June 1978; final version received December 1978.

Abstract

A new method of Vibroseis deconvolution has been recently proposed by the authors. This discussion describes the effects of noise on the application of this method. The initial deconvolution step involves estimating the spectrum of the Vibroseis wavelet by homomorphic filtering. It is shown that noise causes problems with phase estimation. Hence, the Vibroseis wavelet is assumed to be zero phase. Examples demonstrate that zero phase cepstral filtering is a robust wavelet estimation approach for noisy data. The second step of the deconvolution method forms an impulse response model by a spectral extension method. Although this step can improve the resolution of seismic arrivals, it must be applied with caution in view of the deleterious effects of noise.

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