Wedge Model: Shift values outside the zone: The log values will be preserved below and above the zone of interest, so the log curves are shifted up or down. The Fix Zone Bottom of the zone is fixed but only in the Depth domain. Zone Options: The Fix Zone Top is kept level and the bottom changes. The Increment - Defines increments between the start and end parameter values. Slide 6 To set the parameters Start Value will start your wedge at the stated value and the End Value will end your wedge model at the stated value. The Zone of Interest can be formed using tops or by depths from the surface. Select the P-wave, S-wave, and Density The reservoir Interval is the zone of interest for the reservoir. 4 Slide 5 5 Select the Well to you would like to wedge. This will open the parameters to generate a wedge model. With the left mouse button double click the Wedge Modeling option. The wedge model feature can be generated by opening the AVO Modeling option in the processes tab. Slide 4 Opening Wedge Modeling Initiate the wedge model process as indicated. (a) The wedge (b) seismic section across a linear wedge that has lower acoustic impedance than the surrounding sediments for a minimum-phase wavelet (c) amplitude versus thickness graph. The magnitude of the increase and how many amplitude maxima there are depend on the shape of the embedded wavelet. When the wedge is a quarter-wavelength (1/4) thick, the second half-cycle of the reflection from the top interferes constructively with the first half-cycle from the bottom, resulting in an increase in amplitude. The tuning effect illustrated for a wedge the material above and below it is the same, but the wedge has different acoustic impedance.
2 Slide 3 3 Tuning makes two reflected signals appear as either one signal or even as no signal, this thickness therefore represents the minimum bed resolution that the wavelet can identify.
This process requires a well, a wavelet, and a zone for creating the wedge. In this document describes the process of creating a wedge model and viewing the tuning analysis chart. Changes in bed thickness are introduced into the model along with changes in acoustic properties determined through rock physics modeling. Wedge Modeling is used to understand vertical (thin bed) resolution limited by seismic. It creates seismograms but lets you alter a petro-physical or fluid parameter to see the predicted changes.
#HAMPSON RUSSELL SOFTWARE#
Wedge Modeling HRS-9 Hampson-Russell Software Gregg Schleider HRS-9 Houston TX 2012 Slide 2 Wedge Modeling is part of the AVO modeling suite of tools.
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