Naming in the IGI property model

Overview

IGI's geochemical software (Metis and p:IGI+) contains a comprehensive industry-relevant property model. This page explains the naming schema used in the IGI property model.

Usage: Throughout the system, particularly during import and interaction with the range of visualisation artefacts.

Property Component Elements

A complete property description comprises several elements:

Property

A particular aspect of a sample (often a physical or chemical characteristic) on which a measurement is made, e.g. TOC, nC10 concentration, vitrinite reflectance (%Ro). The property name is specified using a short naming convention in most areas of the software.
Full Property Name

A longer description of the property, including key molecular arrangements, is available for reference in the geochemical help and on hover while using the property search.
Property Group

As introduced in the Property Groups lesson, the associated common metadata area, analysis method, or workflow actions that the property belongs to, e.g. LECO, WO-GCMS, GC-IRMS, etc.

Indicator

Quantification method for Molecular and gas data:

1. Molecular data: can be reported as peak heights [h], peak areas [a], concentrations derived from heights [ch] or areas [ca], or without information, and so is an unknown [un] measurement.
2. Gas data: can be given as mass [mass], volume [vol] or mole [mol] fractions, or without information, and so is an unknown [un] measurement.

Tip! The IGI property model can store data for multiple indicators simultaneously, as labs often provide data in both raw count and concentration formats. There is no clear agreement on which measurement form to prefer, so we offer the option to store all data, allowing the user to choose.

Unit

A standard reference system used to quantify/provide meaning to a measurement, e.g. %wt, degrees centigrade, micrograms per gram. The unit Euc stands for Euclid, a natural non-dimensional unit.
Ratio

Used to define properties as the quotient of two other properties, e.g. Pr/Ph - Pristane/Phytane. The ratio format can be shown in either the un-normalised (a/b) or normalised (a/(a+b)) form. The ratio is independent of the unit.

Display of property elements in p:IGI+/Metis

The p:IGI+ property model naming convention and display format as presented across the software:

Return to the Property Model User Guide page