| Autor: |
F Walgenwitz, Régis Thiéry, Stéphane Teinturier, Jacques Pironon |
| Rok vydání: |
2000 |
| Předmět: |
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| Zdroj: |
Journal of Geochemical Exploration. :663-668 |
| ISSN: |
0375-6742 |
| DOI: |
10.1016/s0375-6742(00)00108-4 |
| Popis: |
Petroleum inclusions cannot be considered as water-free inclusions. New Raman and FT-IR experiments have shown solubility of water in hydrocarbons trapped in inclusions for temperature conditions of natural petroleum reservoirs. Water dissolved in a hydrocarbon phase appears at 3630 cm −1 on the Raman spectrum and its Raman fingerprint is totally different from the Raman signature of liquid water in the 3250–3450 cm −1 range. Raman microscope has been coupled with a heating stage to follow water solubility with temperature increase. However, Raman analyses cannot be applied to petroleum inclusions: their fluorescence masks the Raman signal. Similar experiments have been made using FT-IR microspectroscopy on synthetic and natural inclusions. Intensity of the liquid water infrared band decreases with temperature increase due to solubility of water in the oil phase. Therefore, bulk homogenisation temperature of a petroleum inclusion is obtained when the liquid water band, centred at 3400 cm −1 , disappears from the FT-IR spectrum. When aqueous inclusions are associated with petroleum inclusions, homogenisation temperatures of the two inclusion types should be similar. PVTX interpretations of petroleum inclusions should therefore be reconsidered. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect