This tutorial shows how to create an EWE Analysis Model on a 2D Ray Model. SEGY files will be created in two different ways.
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Set parameters as described or shown in pictures of dialogs. As you work, use OMNI 3D’s Popup Help to see explanations of all available parameters. Hover your cursor over a parameter or click the question mark in the upper right of a dialog and then click the parameter for Popup Help.
Working with this Tutorial
If you are new to OMNI 3D, please see the “Basic Land” tutorial before you use this tutorial. In this advanced tutorial it is assumed that you can:
Start OMNI 3D
Create a project
Find and use menus in the Project Tree
Use Pop-Up Help in OMNI 3D’s menus and dialogs
Use right-click menus in the View tabs
This tutorial applies to the tutorial solution project titled “EWE Interactive Example”. You may compare your results to the solution project. Go to Help | Load Tutorial Solutions and open the 2D Ray Model folder. The folder contains both the input data for this exercise and the completed solution project.
To complete this set of exercises you will need this input file:
...\Tutorial\2D Ray Model\EWE Interactive Example-Data\EWE Model.rmd
To open the solution project, double-click the file named:
...\Tutorial\2D Ray Model\EWE Interactive Example.odb
Preparation
Double-click the OMNI 3D? icon on your Desktop to start the program. When OMNI 3D opens, go to File on the OMNI 3D Menu Bar and select New. Create a directory for your project and name it “EWE Interactive”. The result is a database file (EWE Interactive.odb) and a corresponding folder (EWE Interactive -files).
Select Meters for the Units. Do not place a check mark next to Create an Empty Survey.
Right-click on the 2D Ray Models folder and select Add Existing 2D Ray Model File. Browse for and add EWE Model.rmd.
Set Parameters for the EWE Model
Beneath 2D Ray Models you will see the name of the model (EWE Model) and Horizons folder. Expand it to show a list of horizons beneath. Right-click on the name of the first horizon (Surface), select Horizon Style and go to the Horizon Properties tab. You will notice that Gradients and Heterogeneity properties may be added for each horizon layer.
down list at the right to move between horizons. If you change a setting, be sure to click Apply before you move to the next horizon. Note that the Reflects Rays and Q settings are ignored in EWE calculations. However, both are used in Interactive Analysis to create Ray Traced Wavefronts. (Ray Traced Wavefronts are not available when Gradients and/or Heterogeneity are incorporated into the model.)
Create a Well Bore
1.
Beneath the model name (EWE Model), right-click on the Well Bores folder.
2.
Select Create NEW Well Bore from the popup menu. A wizard will open.
3.
Use the mouse to digitize a well bore. Left-click in the yellow horizon, near the 3900 m offset. Progress downward with the mouse, left-clicking to add points to the well bore. Finish in the Red horizon by double-left-clicking the mouse.
4.
There should be a series of coordinates in the wizard edit box. If not, press the Clear button and repeat the above steps.
5.
Press the Apply button on the wizard, to create the new well bore.
6.
Accept the defaults on the Well Bore - Display dialog, and press Finish. The new well bore will now be a part of the model.
7.
Press the Exit button to leave the wizard.
Create an EWE Analysis
1.
Beneath the model name (EWE Model), right-click on EWE Analysis Models and select Create New EWE Analysis.
2.
In the Save File dialog, accept the default name EWE Model–EWE-001.ow2. Click Save to add the analysis file to the EWE Analysis Models folder.
3.
Right-click on EWE Model-EWE-001 and select Interactive.... The Wavefront Analysis Interactive Wizard will open.
Set Shot Location
You can type or click to set the location of the shot.
1.
In the 2D Ray Model View, click on the yellow layer of the model near the 4000 meter offset. In the wizard, the Offset and Elevations are set to the mouse coordinates.
2.
To place the shot point just below the top surface of the model, place a checkmark next to At Surface.
3.
In the wizard, under Shot Location, type “4000” m for the Offset. Note that this moves the shot location indicator on the model.
http://www.cadfamily.com/HTML/Tutorial/GEDCO-EWE%20Elastic%20Wave%20Equation%20Modeling_305939.htm
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