Article,
Relative performance of moveout-based multiple-suppression methods for amplitude variation with offset (AVO) analysis and common midpoint (CMP) stacking
Geophysics, 69 (1): 275--285 (Jan 1, 2004)
DOI: 10.1190/1.1649395
Abstract
We apply three moveout-based methods for multiple suppression to simple
synthetic common midpoint (CMP) gathers and compare their performance
in terms of level of multiple rejection and, more importantly, in
terms of (1) suitability of processed output for use in analysis
of amplitude variations with offset (AVO), (2) primary-to-multiple
amplitude (p/m) ratio of the data after CMP stacking, and (3) preservation
of primary wavelet shape and amplitude on the stack. The three approaches
are filtering in the frequency-wavenumber f-k domain, the Hampson
method of filtering in the parabolic Radon transform domain, and
a hybrid method that improves upon Hampson's approach by using a
variation of Harlan's statistical pattern recognition approach to
separate primaries from multiples in the parabolic Radon transform
domain.The f-k approach is unsuitable prior to AVO analysis; moreover,
it is little better in suppressing the multiples than the CMP stack
itself. Hampson's method performs considerably better and is suitable
for both purposes, although it can yield distorted AVO response where
multiples are relatively strong on input. At about 50\% additional
computation effort over that of Hampson's method, the hybrid approach
has superior treatment of amplitude behavior with offset. For many
situations, the hybrid method yields up to twice the primary-to-multiples
amplitude ratio on the CMP stack.
