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The AAPG/Datapages Combined Publications Database
Indonesian Petroleum Association
Abstract
A Comparative Study of 3-D
Noise
Attenuation Techniques
Abstract
A comparative study is made of various post stack techniques used to attenuate coherent and random
noise
in processing of multi-azimuth 3-D seismic surveys. Subsets of two 3-D surveys acquired in Indonesia are studied to compare the various aspects and consequences of
noise
attenuation techniques. Strategies for attenuating both
random
and coherent
noise
are studied. Predictive filtering in the f-x (frequency - space) domain for
random
noise
suppression may be applied post stack as either a double two dimensional (2-D by 2-D) process (inline and crossline) or using a three dimensional predictive filtering routine (f-xy) which operates simultaneously over a group of inline and crossline seismic traces. f-k (frequency-wavenumber) filters that are designed to attenuate linear coherent
noise
may be applied using concatenated 2-D by 2-D filters provided that the resulting attenuation of
noise
is isotropic (independent of azimuth). The combination of these two techniques to suppress coherent and linear
noise
is evaluated. The results indicate that f-xy filtering is an extremely robust process for attenuating
random
noise
as well as linear
noise
that is "non predictable" over the three - dimensional predictive space. Application of f-xy filtering as the initial post stack process has advantages over the reverse order of application (f-k prior to f-xy) when significant amounts of both coherent linear
noise
and
random
noise
are present.
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