Tuning Analysis and Wedge Modelling

5/25/2018 Tuning Analysis and Wedge Modelling

1/10

Wedge Modeling and Tuning Analysis

Kevin Gerlitz

VHR Jakarta

CE7R4.1


2/10Last Updated: September 2006 2

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




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.




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)




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.




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.




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.




Pick the reflection event

at the base of the wedge

model.

Click OK to save the

picks.




Select AVO Analysis > Pick

Analysis

Select to view the pick

amplitudes of the new

horizon that was just picked.




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.

Documents

Tuning Analysis and Wedge Modelling