%0 Journal Article
%T The Impact of Model Based Offset Scaling Technique on the Amplitude Variation with Offset Responses from 3D Seismic Data Acquired from the Tano Basin, Offshore Ghana
%A Striggner Bedu-Addo
%A Sylvester Kojo Danuor
%A Aboagye Menyeh
%J International Journal of Geosciences
%P 40-53
%@ 2156-8367
%D 2024
%I Scientific Research Publishing
%R 10.4236/ijg.2024.151004
%X Amplitudes<span style=\"font-family:Verdana;\"> have been found to be a function of incident angle and offset. Hence
data required to test for amplitude variation with angle or offset needs to
have its amplitudes for all offsets preserved and not stacked. Amplitude
Variation with Offset (AVO)/Amplitude Variation with Angle (AVA) is necessary
to account for information in the offset/angle parameter (mode converted S-wave
and P-wave velocities). Since amplitudes are a function of the converted S- and
P-waves, it is important to investigate the dependence of amplitudes on the
elastic (P- and S-waves) parameters from the seismic data</span><span style=\"font-family:Verdana;\">. </span><span style=\"font-family:Verdana;\">By modelling these effects for different reservoir
fluids via fluid substitution, various AVO geobody classes present along the
well and in the entire seismic cube can be observed</span><span style=\"font-family:Verdana;\">. </span><span style=\"font-family:Verdana;\">AVO analysis was performed on one test well (Well_1)
and 3D pre-stack angle gathers from the Tano Basin. The analysis involves
creating a synthetic model to infer the effect of </span><span style=\"font-family:Verdana;\">offset scaling techniques </span><span style=\"font-family:Verdana;\">on amplitude responses in
the Tano basin as compared to the effect of </span><span style=\"font-family:Verdana;\">unscaled seismic data. The spectral balance process was performed to
match the amplitude spectra of all angle stacks to that of the mid (26<span style=\"text-wrap:nowrap;\">กใ</span>) stack
on the test lines</span><span style=\"font-family:Verdana;\">.</span><span style=\"font-family:;\" \"=\"\"><span style=\"font-family:Verdana;\"> The process had an effect
primarily on the far (34<span style=\"text-wrap:nowrap;\">กใ</span> - 40<span style=\"text-wrap:nowrap;\">กใ</span>) stacks. The frequency content of these stacks
slightly increased to match that of the near and mid stacks. In offset scaling
process, the root mean square (RMS) amplitud</span><span style=\"font-family:Verdana;\">e
comparison between the synthetic and seismic suggests</span></span><span style=\"font-family:Verdana;\"> that</span><span style=\"font-family:Verdana;\"> the
amplitude of the far traces should be reduced relative to the nears by up to
16%. However, the exact scaler values depend on the time window considered.
This suggests that the amplitude scaling with offset delivered from seismic
processing is only approximately correct and needs to be checked with well
synthetics and adjusted accordingly prior to
%K Amplitude Variation with Offset (AVO)
%K Model Based Offset Scaling Technique
%K Tano Basin
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=130911