Puerto Rico: reconnaissance study of the maturation and source rock potential of an oceanic arc involved in a collision |
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| Affiliation: | 1. Université de Paris, Institut de Physique du Globe de Paris, CNRS, F-75005 Paris, France;2. Université Paris-Saclay, CNRS, GEOPS, Orsay 91405, France;3. PSL Research University, Lab. Géologie, UMR 8538 CNRS, Ecole Normale Supérieure, Paris 75231, France;1. Instituto Geológico y Minero de España (IGME), c/ La Calera 1, 28760 Tres Cantos, Madrid, Spain;2. Departamento de Estratigrafía y Paleontología, Universidad de Granada, Campus Fuentenueva, 18002 Granada, Spain;3. BRGM, Av. C. Guillemin, 45060 Orleans, France;4. INYPSA, c/ General Díaz Porlier 49, 28001 Madrid, Spain;5. School of Geosciences, University of Edinburgh, Grant Institute, The King''s Buildings, West Mains Road, Edinburgh EH9 3JW, UK |
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| Abstract: | Amount and type of organic matter present in Cretaceous and lower Tertiary rocks deposited on Puerto Rico were determined by total organic carbon (TOC) analysis, visual kerogen identification and Rock-Eval pyrolysis. These tests show that the samples commonly contain greater than 1% TOC, and a mixed population of kerogen, with gas-prone kerogen predominating.Based on organic maturity data (vitrinite reflectance, thermal alteration index and Rock-Eval pyrolysis), the maturation history of Puerto Rico is consistent with a two stage thermal model. Before the Oligocene, the island was part of an active magmatic arc. High geothermal gradients and rapid burial left Cretaceous rocks overmature and mature with respect to generated liquid hydrocarbons. After the Eocene, volcanism ceased following collision with the Bahama platform, and lower geothermal gradients combined with slower burial resulted in little maturation. |
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