OpendTect User Documentation version 3.2
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Chapter 4. Menu - File

Table of Contents
4.1 Survey
4.2 Session
4.3 Import
4.4 Export
4.5 Manage



4.1. Survey

4.1.1. Description

The Survey module is used to select, create and/or modify surveys. A survey defines the geographical boundaries of an OpendTect project and relevant positioning information such as the relationship between inline/crossline and X/Y co-ordinate systems. Each survey (project) stores its data in a separate directory that needs to be specified along with the survey reference name.

4.1.2. Survey selection window



Select an existing survey from the list of surveys on the left or create a new one with "New"... (see below). The boundaries of the survey are depicted in the graphics field on the right. The Notes field is a free-format text field to store relevant survey notes.

WARNING: Remove... will remove the entire project from disk!

Set Data Root. When you installed OpendTect, you selected an OpendTect data directory, where all your surveys are stored. With this option you can change this general OpendTect data directory.

X/Y <-> I/C. In the position conversion window there are two modes available for coordinate conversion: Manual / File. In Manual mode, you specify a inline/crossline pair, or a X/Y pair, and press the corresponding arrow key to obtain the position in the other domain. In File mode, you browse the input file and create new output file. By specifying the corresponding type conversion (XY to IC or IC to XY) and pressing GO button, the desired conversion is written on output file.




Export to Google Earth/Maps.

After clicking in this icon, , the following window pops up allowing the user to reach the google map area of this survey.



This window has three options: the first is the X and Y coordinates in or near survey, the second option is the corresponding lateral and longitudinal coordinate in decimal, and the final option allows the to specify that the coordinates are in feet.

4.1.3. New/Edit Survey setup window

All fields in this window are mandatory.

Survey directory name. Specify the name of directory you want to be created in the disk. This is the name of your directory in which all types of OpendTect data would be stored.

Survey name. Specify the OpendTect survey name. A best practice can be (although not necessarily) that the survey directory name is set same as the OpendTect Survey name.

Location on disk. Specify the directory at where you want to save the project.

Survey type. For the survey type, there are three options;



Note: Select only 3D, if the survey to be created will contain only 3D type data set. Select both 2D and 3D, if survey will contain both 2D and 3D type data set. And if survey will contain only 2D type data set, select only 2D .

4.1.3.1. Survey Ranges

The survey ranges can be filled in manually, but also by scanning a SEG-Y file, by using the simple set for 2D only option, or by copying the ranges from an other survey. Depending on what plugins you have installed in OpendTect, like e.g. the ARKCLS data access plugin, you will see the Get from GeoFrame or Get from Seisworks option in the pulldown menu.

Click on the Scan SEG-Y file(s) button to select a SEG-Y file. In the new window you set the SEG-Y settings, see also Section 4.3.1.1.2. Pressing OK will start scanning the file(s). After scanning, you'll get a file report containing sampling info, data statistics, and survey setup. The "Survey ranges" and "Coordinate settings" will be filled in automatically.

The option 2D only is especially suited if you plan to use 2D seismic lines only. Set the average trace distance and the x and y coordinate ranges, and these will automatically be translated into suitable survey settings.

Note that Z range can be specified in milliseconds, meter, or feet.

4.1.3.2. Coordinate settings

The relationship between inline/crossline and X/Y can be specified in two ways. The easy way is to specify three points, two of which must be on the same inline. Due to rounding off errors, this method may not be 100% accurate.



In the "Advanced" option, the exact transformation from one co-ordinate system to the other can be specified. The "Apply" button can be used to verify results graphically and to check the co-ordinate transformation formulae.

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