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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
The Effects of Seismic Data Conditioning on Pre-Stack Simultaneous Impedance
Inversion
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Scott W. Singleton
Rock Solid Images, 2600 S. Gessner Rd., Ste. 600, Houston, Texas 77063
ABSTRACT
The demands that reservoir characterization place on seismic data far outweigh
those of traditional structural interpretation. Because of this, gather conditioning
is seen
by many as a prerequisite to pre-stack inversion
. This paper discusses three
conditioning
processes—signal/noise (S/N) improvement, stretch removal, and reflector
alignment.
It then seeks to document the improvements that these processes achieve in
the
gathers and in the
inversion
. Specifically, the gathers were measured for amplitude
versus offset (AVO) fit using a two-term Shuey equation and found to be improved
by
20%. A comparison of wavelets extracted from the angle stacks found amplitude
and
phase spectra to be much more stabilized, even out to the far angle stack.
The far angle
stack seismic/synthetic
inversion
residuals showed a 40% drop in amplitude
and completely
different frequency and reflector character. Finally, the acoustic impedance
(AI) / shear impedance (SI) cross-plot showed a much more compact signature
that allowed
lithology and pay discrimination. Conversely, the raw data cross-plot contained
noisy data that entered into the area of the polygon where the pay signature
lay.
Geobodies captured from improperly conditioned data are thus (1) inflated in
size, and (2) have lower impedances. These errors, in turn, lead to incorrect
rock property
and
reserve estimations.
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