Open Access
Review
Appendix C
Analytical tools to study a rock H2 potential with their characteristics.
| Analyses | Objectives | Limitations | Spatial resolution | Limit of detection | Sample type | Duration of preparation/analysis/processing |
|---|---|---|---|---|---|---|
| Bulk characterization | ||||||
| Rock-Eval | Characterization of the Total Organic Content (TOC) | Powder (~10 mg) | min/min/min | |||
| Access to mineral and organic contents but also thermal analysis of C and S | ||||||
| X-ray fluorescence | Major elements concentrations (Fe, S, U, Th, K) | Does not detect trace elements | – | Depends on the element | Soli, powder, liquid | –/min/min |
| Inductively Coupled Plasma – Mass Spectrometry/Optical Emission Spectroscopy (ICP-MS/OES) | Majors, minors, traces, and ultra-traces concentrations (Fe, S, U, Th, K) | ppb | Powder (~100 mg) | hours/hours/days | ||
| 57Fe Mössbauer spectroscopy | Identification and quantification of iron-bearing phases and iron specification in each phase | Powder (~400 mg) | hours/days/days | |||
| X-Ray Diffraction | Phase identification, quantitative composition | Do not differentiate polymorphs or minor phase | – | Powder (~500 mg) | hours/hours/hours | |
| Observation tool | ||||||
| Optical microscopy | Paragenesis, texture, alteration features | Low resolution | μm | – | Thin section | |
| Electro Probe Micro-Analyzer (EPMA) | Quantitative measurements of concentration of the element heavier than Li (Fe, S, U, Th, K) punctual or map | μm | ppm | Thin section | hours/day(s)/days | |
| Scanning Electron Microscopy (SEM) | High-resolution imaging demi-quantitatve measurements of concentration of the element heavier than Li (Fe, S, U, Th, K) punctual or map | Semi-quantitative | nm | – | Thin section | hours/hours/hours |
| Raman Microspectroscopy | Phase identification | μm | Thin section | hours/days/days | ||
| X-Rays Microtomography (XCT) | Volume and propagation of elements of interest-bearing phase in the whole rock | No chemical information, can be hard to distinguish chemically close phases, post-processing can be challenging, time consuming | μm | cm3–m3 core | hours/hours/days | |
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Les statistiques sont disponibles avec un délai de 48 à 96 heures et sont mises à jour quotidiennement en semaine.
Le chargement des statistiques peut être long.