Rock and Soil Characterisation
At Isolab, we offer detailed geochemical characterisation of rock and soil samples to support studies in geology, petroleum systems, environmental science, and more. Our analyses focus on organic carbon content (TOC), thermal maturity (Rock-Eval), Rock extraction and carbon isotopic composition.
Sample Preparation
All samples are finely ground prior to analysis. If needed, an organic solvent extraction step is performed to remove contaminants (e.g. drilling mud residues or surface pollution), ensuring reliable results.
Carbon Content Analyses (TOC)
We determine both Total Organic Carbon (TOC) and Total Carbon (TC) using a LECO CS200 combustion analyzer.
| Analysis Type | Acidification | Measures |
| TOC | Yes | Organic carbon only |
| TC | No | Organic + inorganic carbon |
Both TOC and TC values can be coupled with carbon isotope (δ¹³C) measurements for source attribution and diagenetic studies.
TOC Analysis with LECO CS200
In TOC analysis, inorganic carbon is first removed by acidification. The sample is then combusted at high temperature, and the resulting CO₂ is measured to determine organic carbon content.
Rock-Eval Pyrolysis
We perform Rock-Eval pyrolysis using a Rock-Eval 6 analyzer to determine:
- Kerogen type
- Hydrocarbon generation potential
- Thermal maturity
- S1, S2, S3, Tmax parameters
Isotopic Measurements of rock samples
Carbon isotope ratios (δ¹³C) can be measured on:
- TOC (after acidification)
- TC (without acidification)
These data provide valuable insights into the origin of organic matter, depositional environments, and post-depositional alteration.
What is Rock-Eval?
Rock-Eval pyrolysis involves heating a rock sample in a programmed furnace to release hydrocarbons (S1 and S2) and CO₂ (S3). The results give insight into organic matter quality and thermal evolution.
