GEOCHEMICAL ANALYSIS – PETROLEUM
Purposes of the crude oil geochemical study
- Genetic type of oil
- Maturity of the source organic matter
- Correlations: oil – oil and oil – source rock
- Influence of secondary processes:
- biodegradation
- water washing
- evaporation fractionation
- thermal cracking
Crude oil – geochemical analysis
- Oil sampling and purification
- Density (API gravity)
- Sample preparation (topping)
- Sulfur kontent
- Fraction composition: saturated hydrocarbons, aromatic hydrocarbons, resins, asphaltens
- Gas chromatography (GC) of oil – biomarkers:
- GC–MS (saturated hydrocarbons)
- GC–MS (aromatic hydrocarbons)
- GC–MS–MS
- Stable carbon isotopes: oil, saturated hydrocarbons, aromatic hydrocarbons, resines, asphaltens
- Stable sulfur isotopes: oil – resins
- Elemental composition of the asphaltens ( C, H, O, N, S)
- Content of the U, Th, Co, Pb, Zn, Cu, V, W, Ni, Mo, etc. in petroleum