OpendTect User Documentation version 3.2
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Chapter 3. How to...

Table of Contents
3.1 Quickstart a Project.
3.2 Interpret horizons
3.3 Make attribute crossplots
3.4 Make bodies



3.1. Quickstart a Project.

OpendTect is a seismic attribute processing and interpretation system.

The primary input is:
The primary outputs are:
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 start-ups, OpendTect will start-up in the survey that was active when the program was closed. The user may select another, pre-defined 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. Specify the name, ranges and the relationship between inline / crossline and X / Y co-ordinates in the survey parameter window. You can enter the survey geometry manually or by scanning a segy file. After scanning, you can still adjust all parameters. The notes area can be used for free format information (e.g: type of survey ...).

Optionally, a data access module can be purchased at dGB that gives access to Seisworks/OpenWorks (Landmark) or GeoFrame (GeoQuest IESX). The core of this module is developed by UK-based software providers ARK-cls and is known as Ideal Toolkit (ITK). The license gives you access for the datastore of your choice. It currently supports I/O of survey parameter, seismic data, horizons, and well data.

Import seismic data. Select Import-SEGY from the Files menu and specify the input parameters. In case you do not know the parameters, use the "Examine" utility to dump the EBCIDIC header, the binary header and the first 4 trace headers. From these it should be possible to determine the few input parameters needed by the program. The internal OpendTect format is 8,16 or 32-bit depending on whether the input cube was 8, 16 or 32 bit.

Generating seismic attributes. Now, you are almost ready to go! You have created a survey, which contains at least one seismic volume. To do some real work, you must also create one or more attributes in the attribute engine that reveal relevant, useful seismic information. Several default attribute sets are available to get you started quickly. Open the attribute engine Processing/Attributes (or press the "Edit attributes" icon) and press the button to open a default attribute set. You are asked to select the input data to complete the attribute definitions. Press "OK" to save the attribute set and to go back to the main window.

Display your data or attributes. Now you are ready to display any of the defined attributes, anywhere in the volume. Create, for example, an inline element by right-clicking on inline in the tree and pressing Add. Go into interact mode (press ). Position the element in the middle of the cube by using the arrows along the side of the element. 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. You can either select from a stored volume or you select one of the defined attributes. If you choose an attribute, then this attribute will be calculated on-the-fly at all sample positions of the displayed element.

Now you are ready to go with OpendTect!
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User interaction Interpret horizons