Seismic Database Filenames

During import, WinPICS creates a set of support files for each SEG-Y data file. These support files are given the name of the data file with an identifying extension. Data and header files are assigned extensions based on the trace data type:

8-bit files use an 8 in the extension
16-bit files use a y in the extension
32-bit files use an f in the extension

The exception to this rule is the .sgy extension that can also be used for 16-bit files. This has been included for backward compatibility with old DOS PICS Projects.

Extensions used for SEG-Y data and support files

Filenames in this table refer to the original versions of a seismic line/dataset. Subsequent versions of name.yd0, for example, would be named name.yd1, name.yd2, name.yd3, etc. in the order that they are created. See Version Names for SEG-Y Data for more details.

Here are some ground rules for working with WinPICS files:

Reserve your project directory for WinPICS project files only. If you have non-project files stored in your project directory with extensions such as .yd0, .fh0, .qq0, or any other extension used by WinPICS, you will create serious problems with your database. If you must store non-project files in this directory, try storing them in a sub-directory of the project directory.
If you want to delete a seismic line or 3D dataset from your project, delete all the associated support files. For example, let’s say you have two versions of a 32-bit 3D seismic dataset: moose.fy0 and moose.fy1. If you want to delete the second version, you must delete moose.fy1, moose.fh1, and moose.qq1, i.e. anything with a 1 in its extension. Similarly, if you want to delete the entire volume, you must delete all files named moose.
Never have both name.sgy and name.8d0/name.yd0/name.fy0 in the same project. (The name.sgy files are the original source files while name.8d0, name.yd0, and name.fy0 are the imported SEG-Y files for 8-, 16-, and 32-bit data, respectively.) You can avoid this problem upon import if your source directory is different from your project directory. When you import your data, the Import Wizard outputs a name.8d0/name.yd0/name.fy0 into your project directory and keeps the original name.sgy in the source directory.

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