OpendTect
A two minute tutorial for getting startedby Lucas Freitas
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OpendTect is a seismic interpretation software system in an open source environment. It enables you to process, visualize and interpret multivolume seismic data using attributes and modern visiualization techniques such as stereo viewing and volume rendering.
OpendTect Base Licenses
If you use OpendTect, either as an enduser, or as a programmer, you automatically agree with the OpendTect license agreement. Commercial usage of the software, and software derived from OpendTect, are subject to a modest annual maintenance & support fee. If you want to use OpendTect in projects with a commercial intent you are thus obliged to sign the OpendTect maintenance agreement and pay the annual fee.
Annual maintenance & support fee: €1600 per simultaneous user
To obtain (a) license(s), please contact [email protected] This email address is being protected from spam bots, you need Javascript enabled to view it However, OpendTect usage is free for R&D, educational purposes and evaluation.
OpendTect Plugin Licenses
Additional to OpendTect base you may want to purchase commercial plugins. Such plugins are covered by separate license agreements with the respective vendors.
For SSIS, Dipsteering, Neural networks, Spectral Blueing, Coloured Inversion and Workstation access plugin licenses, please visit the dGB website
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Download OpendTect base and/or OpendTect Plugins
The download center can be reached in:http://download.opendtect.org/
and looks like
After choosing the appropriate release (for visualization purposes I recommend the Stable one), the second column will load the available distributions:
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After picking a distribution, the packages available for download will be shown in the third column.
In order to get an clickandgo instalation, select and download to the same directory the “<Complete package>” but also the “Instalation script” (note that depending on your browser you may need to rightclick and choose 'saveas' for downloading the “install.od” script).
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Unix Instalation instructions
Run the install.od script (use 'chmod +x install.od' or enter 'csh install.od'). After this, there should be an opendtect3.0 directory at the location you selected. That directory contains OpendTect; scripts are present in that directory to start OpendTect, batch programs, create data directories and more.
If all fails, unzip and untar the packages yourself and install the software like:cd opendtect3.0./install
Then:
1) If you haven't got a $DTECT_DATA directory yet, make sure of that now, use the 'mk_datadir' script to create such a directory. The resulting directory needs to have the right permissions for all users.
2) Now, the start_dtect script should bring up OpendTect.
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IMPORTANT!!OpendTect need not be installed by 'root' (exception when using SELinux). In fact we recommend to use an 'application manager' account. In any case, use the same user account for all application management actions.
Quickstart a Project.OpendTect is a seismic attribute processing and interpretation system.
The primary input is:
• a 3D seismic data volume. Seismic data cubes are imported via SEGY.
The primary outputs are: .
• a 3D volume such as a filtered cube, or any other type of cube produced by the system. Seismic data cubes are exported via SEGY.
• Horizons interpretations.
OpendTect projects are associated with a seismic survey.
The first time OpendTect is started, the user must define a new survey and import seismic data. At subsequent startups, OpendTect will startup in the survey that was active when the program was closed. The user may select another, predefined survey using File/Survey and browsing to its location using Set data root.
Define a new survey.
Select the Survey option under the File menu or click on the Survey icon. The following window will pop up:
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If no survey is present (that is our case), you'll have to create one. After clicking in the “New...” button a “Survey Setup” window will pop up.
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In this window, you have to specify the name, ranges and the relationship between inline / crossline and X / Y coordinates in the survey parameter window.
You can enter the survey geometry manually or by scanning a segy file, as shown in the window below
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After scanning, you can still adjust al parameters. IMPORTANT: Remember to map headers correctly. It may be necessary to return to the application where the SEGY was generated to verify the mapping.
The notes area can be used for free format information.
After providing the survey information correctly, you'll be lead back to the “Survey Selection” window. This time, there will be a description of the created survey:
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Import seismic data.
Select ImportSEGY from the Files menu
The following window will pop up:
and specify the parameters. In order to define the SEGY input, a window will pop up (below). At this window, you'll have to specify the input SEGY file and other acces parameters. Just like in the “Survey Setup” case, you may have to verify the header mapping.
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One of the fields of the “Seismic SEGY access” window is the “Output Cube”. When selecting a cube, the “Output selection” window will pop up and you have to write down a name for the cube.
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Display your data or attributes.
Now you are ready to display our seismics. Create e.g. an inline element by right clicking on inline in the tree and pressing Add.
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Go into interact mode (press ). Position the element in the middle of the cube by using the arrows along the side of the element (nothe the transparent slice).
When positioned, click anywhere in the black area (outside the element) and select in the data selection window that automatically pops up the data you wish to view on this element.
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You can either select from a stored volume or you select one of the defined attributes. If you choose an attribute than this attribute will be calculated onthefly at all sample positions of the displayed element.
Now you are ready to go with OpendTect!
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