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Wedge Modeling and Tuning Analysis
Kevin Gerlitz
VHR Jakarta
CE7R4.1
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Wedge Modeling And Tuning Analysis
This document describes the process of creating a wedge model and viewing the tuning
analysis chart.
This process requires a well, a wavelet and a zone for creating the wedge.
Select Synthetic > Zoeppritz
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Wedge Modeling And Tuning Analysis
Provide a name for the synthetic
and select the correct wavelet.
In this case, a single trace per
offset is being computed but the
data is being stacked from 0 to
1000 m offset.
Select the Wedge Model option.
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Wedge Modeling And Tuning Analysis
On the next menu page, select the
wedge parameters:
1) the zone for adding and
removing material2) the thickness range of the
wedge
3) and how to make the wedge
(from the top or the base),what to do with material
outside the zone (shift or
remove) and how to handle
the depth-time curves.
You can also select to create the
well log models to verify the
process. Select Output
Wells to run this option.
(1)
(2)(3)
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If you select to Output Wells, the
following menu page will appear.
The new wells will be given a
new name with the specified
prefix.
The software will automatically
create the P-, S-wave and density
logs.
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When the software finished
processing, two windows
will appear: the seismic
window with the synthetic
wedge model and the Wellto Seismic map Menu.
If you selected to Output
Wells, all the new synthetic
wells will be displayed andplotted at the correct
position. Click Ok on this
menu.
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If you selected to Output
Wells and if you mapped
the wells, the following
type of display will be
shown with the wellsoverlaid on the seismic.
You can select todisplay the tops of the
top and base of the zone.
Click Horizon > Pick
Horizons to create the
tuning analysis chart.
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Pick the reflection event
at the base of the wedge
model.
Click OK to save the
picks.
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Select AVO Analysis > Pick
Analysis
Select to view the pick
amplitudes of the new
horizon that was just picked.
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The pick analysis chart is shown at the bottom of the seismic window. The traces correspond
to the thickness of the layer. In this example, the maximum amplitude occurs at a 39 m which
defines the tuning thickness (maximum constructive interference). This thickness corresponds
to a quarter of the wavelength (/4). In this case, the dominant wavelength is 156 m.