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For the purposes of predictive deconvolution one assumes that the seismic trace results from the convolution of a reflectivity series with a wavelet. A fundamental component of the seismic wavelet model is the intrinsic absorption of the earth that causes loss of high frequencies to anelastic processes during propagation. Another potentially important component of the wavelet model is the apparent attenuation caused by short-period multiples. Here we examine whether these two processes act similarly enough to be combined into a single "effective attenuation" operator for signal processing purposes. We conclude that they can be combined except in cyclic depositional environments that contain many high reflection coefficients, when the apparent attenuation operator can no longer be accurately modeled as minimum phase.

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