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  1. Log learning set
  2. LAS file Editor
  3. Alias Editor
  4. LAS log Displayer
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  7. Summaries & Upsc
  8. Ionic Water Analysis

  9. Well Log Scripting:

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  1. How to plot a LAS file
  2. Export data to Excel
  3. The log-plot display
  4. Flatten MD to TVDSS
  5. Function Workflows
  6. Petrophysical Aliases
  7. Multiwell Workflows
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  9. Water Salinity
  10. Mineral Solvers
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  1. Merging LAS files
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  5. Confidence bands
  6. Build Permeab. Corr.
  7. Demo files data set
  8. Core Data Import
  9. Computing Net-Pay
  10. Petrophysical Cutoffs
  11. VSH from GR index
  12. VSH from Neut-Dens
  13. Water Saturations
  14. Indonesia Water Sat.
  15. Mod. Simandoux Eq
  16. Fracture Porosity
  17. Geomechanic Logs
  18. Split Rock Volume
  19. Mineral Solvers
  20. Pay Indicator Index
  21. Water Salinity & Rw
  22. Estimating RHOM
  23. Estimating Rw & m

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  1. BVW Rock Typing
  2. NMR Rock Typing
  3. NMR Fluid Typing
  4. SWirr from well logs
  5. Water Sat. from Rxo
  6. Porosity from Rxo
  7. Porosity from Rt
  8. Vshale or Vclay ?
  9. Gas cap detection
  10. Biased Beta Distr
  11. Shaly Pickett Plot Eq.

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Install and run for free GeolOil Petrophysics to check your mnemonics in any LAS file.


GeolOil - List of standard LAS curve Mnemonics dictionary   


A Curve Mnemonic is the name of the curve in a LAS file. It must be a short single word with two or more letters, numbers, and optional underscores. In GeolOil, the mnemonics must satisfy these conditions:

  1. The mnemonic must start with a letter.

  2. No white, blank spaces, tabs, or any special characters are allowed. However, underscore characters "_" are allowed.

  3. The mnemonics can freely combine uppercase and lowercase letters. However, prefer uppercase letters for maximum compatibility between different software vendors. Detection of mnemonics are case insensitive.

  4. Non unique mnemonics are allowed in the same LAS file. Different LAS curves can have the same mnemonic —unfortunately it is quite common and confusing—. However, it is a bad practice to use the same mnemonic for different curves.

It is virtually impossible to provide a complete collection of "standard" curve mnemonics. They can be counted by hundreds or even thousands, and growing. Each logging company assigns its own mnemonics, and each interpreter usually assigns its own mnemonics, with versions and initials. It is normal.


An Alias is a short meaningful word —with the same rules as the mnemonics— intended to simplify the broad diversity of mnemonics curves. For instance, several LAS files can easily have many curve mnemonics for Gamma Ray, like GR, GR1, GAMMA, GR3, all of the them with similar properties and different qualities and resolutions. An alias simply called GammaRay could be a candidate for such collection of mnemonics.


You are welcome to install and run for free our GeolOil Petrophysics Software to automatically search for mnemonics. Just upload a LAS file and then hit the button Guess all to pair mnemonics with aliases. You may also create your own dictionaries of aliases and mnemonics.


GeolOil Petrophysics Software Panel to associate mnemonics with aliases

GeolOil Petrophysics Software Panel to associate mnemonics with aliases



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