Modelling of the thermal history of the Carboniferous Lorraine Coal Basin: Consequences for coal bed methane
| Titre | Modelling of the thermal history of the Carboniferous Lorraine Coal Basin: Consequences for coal bed methane |
|---|---|
| Auteur(s) | Izart, A. Barbarand, J. Michels, R. Privalov, V. A. |
| Date | 2016 |
| Titre de la série | International JOurnal of Coal Geology |
| Volume | vol. 168 |
| N° de page(s) | 253-274 |
| Résumé | This paper proposes a new scenario for the thermal history of the Carboniferous Lorraine Coal Basin following the tectonicmodel developed by Averbuch et al. (2012) and establishes someconsequences for the coal bed methane (CBM) exploitation. Organic matter maturation data (Vitrinite Reflectance) determined on eleven boreholes in the eastern Lorraine have been used to characterize the Lorraine Coal Basin evolution. Paleozoic and Mesozoic overburials have been calculated using a thermalmodelling software (Petromod). Results showthat (1) Paleozoic erosion may be estimated at a maximumof 1200mwhich represents a lowamplitude event, (2) a little erosion occurred between Upper Paleozoic and Lower Mesozoic: paleotemperature offset is about 20 °C and VR data range from 0.7 (Westphalian D) to 0.5 (Lower Triassic), (3) Cretaceous cover overburial reaches a maximum of 300mand decreases eastwards and (4) the variation of heat flows is in agreement with the compressive and extensive phases of Paleozoic and the extensive phase of Mesozoic. Consequences on the petroleumsystem are the following: organic matter is immature in the Jurassic and Triassic sedimentary rocks, mature (oil window) in the Permian, Stephanian and Westphalian C-D, highly mature (gas window) in Westphalian A-B-C and overmature in Namurian-Westphalian A. The high methane adsorption capacity of coal and the presence of natural fractures inside coal seams demonstrated by coal tomography allow a high CBM potential in this basin. The Lorraine Coal Basin is therefore a target for coal gas. |
| Langue | Anglais |
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