Tag: seismic processing

In a previous post I compiled a brief review of the free SeiSee software for quality control of SEGY data, including trace headers. In this post I briefly review SeisTopia which has very recently (May 2021) been released by Kev Roberts. Please also see here for a review of Geo2View. I used the same data for my SeiSee review which is a 12935 trace migrated stack released by USGS from the 2018 Matrix Survey with shot records from the same line.

1. License
   • Both viewers are free to download but are not covered by any standard license agreements (e.g. GNU).
   • I did find that Windows Defender anti-virus flags the colourbar editor shipped with SeisTopia. I’ve scanned this file with Bitdefender and it is totally clean. In any case you will not need the colourbar editor unless you plan to load customised colourbars.
2. Hardware
   • SeisTopia and SeiSee both run under Windows10, but the newer versions of SeiSee also run under Linux.
3. Support
   • Both viewers are officially unsupported, however SeiSee has been around for many years, many people are familiar with it and the developer does seem to release updates every few years. The recent release of SeiSee code could lead to extended 3rd party support in the future.
4. Data Input/Output
   • The SeisTopia user has to select (or drop in) one file at a time which is less useful than SeiSee for QC of multiple files in a single directory, switching between many files and comparing headers etc.
   • SeiSee will read seismic unix and CGG format files, as well as SEGY. SeisTopia will read up to SEGY Rev1.
   • SeiSee allows the user to edit/export SEGY files and modify headers.
5. Seismic Display
   • The SeisTopia viewer options are nicely laid out and of excellent quality, probably better than SeiSee but sometimes slower as the files buffer from disk. The mouse wheel can be used to quickly change parameter values as well as to scroll the seismic displays. The mouse buttons can be used to quickly zoom in/out of the displays. It’s all very intuitive and the help file is quickly accessible if you need it.
   • I loaded 5Gb of shot records very quickly into SeisTopia and it was impressively quick to scroll through the file for quality control. I was able to view windowed Amplitude Spectra, test bandpass filters and FK filters.
6. Trace Header QC
   • SeisTopia pops the trace headers into a different window and the user can scroll up and down the section to see how the header values change. Two headers can be selected for the seismic display, with a third header available for a graphic type overlay (useful for elevation for example).
   • A 3D map viewer can be used to select inlines, crosslines and timeslices and make maps of header values (e.g. fold, elevation) so as a 3D Viewer SeisTopic far exceeds the capabilities of SeiSee and comes into territory previously occupied by OpenDtect. Other 3D viewers are also available for quality control of seismic data.
7. Processing Options
   • Both viewers have similar display options such as AGC and Bandpass Filter, SeisTopia has a few additional extra options such as t-squared gain, instantaneous attributes, a pseudo relief option and the ability to perform a windowed FK display as well as a normal amplitude spectrum.