Insights to controls on dolomitization by means of reactive transport models applied to the Benicàssim case study (Maestrat basin, E Spain)
| Autor: | Anna Travé, Enrique Gomez-Rivas, Albert Griera, Mercè Corbella, Esteve Cardellach, Antonio Teixell, S. L. Stafford, R. Salas, Juan Diego Martín-Martín |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Dolostone
Maestrat basin Geology Volcanism Tectonics chemistry.chemical_compound Fuel Technology Dolomite distribution chemistry Geochemistry and Petrology Magmatism Genetic model Reactive transport models Earth and Planetary Sciences (miscellaneous) Dolomitization Carbonate rock Carbonate Economic Geology Petrology Hydrothermal dolomitization |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname Dipòsit Digital de Documents de la UAB Universitat Autònoma de Barcelona |
| Popis: | Partially dolomitized carbonate rocks of the Middle East and North America host large hydrocarbon reserves. The origin of some of these dolomites has been attributed to a hydrothermal mechanism. The Benicàssim area (Maestrat Basin, eastern Spain) constitutes an excellent field analogue for fault-controlled stratabound hydrothermal dolomitization: dolostone geobodies are well exposed and extend over several kilometres away from seismic-scale faults. This work investigates the main controls on the formation of stratabound versus massive dolomitization in carbonate sequences by means of two-dimensional (2D) reactive transport models applied to the Benicàssim case study. Simulation results suggest that the dolomitization capacity of Mg-rich fluids reaches a maximum at temperatures around 100 °C and a minimum at 25 °C (studied temperature range: 25-150 °C). It takes of the order of hundreds of thousands to millions of years to completely dolomitize kilometre-long limestone sections, with solutions flowing laterally through strata at velocities of metres per year (m/a). Permeability differences of two orders of magnitude between layers are required to form stratabound dolomitization. The kilometrelong stratabound dolostone geobodies of Benicàssim must have formed under a regime of lateral flux greater than metres per year over about a million years. As long-term dolomitization tends to produce massive dolostone bodies not seen at Benicàssim, the dolomitizing process there must have been limited by the availability of fluid volume or the flow-driving mechanism. Reactive transport simulations have proven a useful tool to quantify aspects of the Benicàssim genetic model of hydrothermal dolomitization. © 2014 EAGE/The Geological Society of London. The research was also partially financed by the Spanish Ministry of Economy and Competitiveness with projects CGL2010-18260 and CGL2011-26488. |
| Databáze: | OpenAIRE |
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