An extensional syn-sedimentary structure in the Early Jurassic Trento Platform (Southern Alps,Italy) as analogue of potential hydrocarbon reservoirs developing in rifting-affected carbonate platforms |
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| Institution: | 1. Ruhr-Universität Bochum, Institut für Geologie, Mineralogie und Geophysik, D-44870 Bochum, Germany;2. Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, 8000 Aarhus C, Denmark;3. Department of Earth Science and Engineering, Imperial College London, Prince Consort Road, London SW7 2BP, UK;4. Faculty of Science and Techniques, University of Errachidia, BP 509, Boutalamine, Errachidia 52000, Morocco;1. Department of Earth Sciences, Geological Institute, ETH Zürich, Sonneggstrasse 5, CH-8092 Zürich, Switzerland;2. Department of Earth Sciences, Institute of Geochemistry and Petrology, ETH Zürich, Clausiusstrasse 25, CH-8092 Zürich, Switzerland |
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| Abstract: | This work focuses on the 3D modeling and structural analysis of the Monte Testo syn-sedimentary structure, developed in the Early Jurassic Calcari Grigi Group of the Trento carbonate platform (Southern Alps, Italy). Significant changes in the facies architecture of the platform sedimentary units, occurred across a global perturbation of the Carbon cycle at the Sinemurian-Pliensbachian boundary, are associated with evidences of syn-sedimentary tectonics. In particular, an early cemented oolitic sedimentary body with a high initial porosity (Loppio Oolitic Limestone) was broken-up and tilted by a pulse of rifting and overlain by tight marls and marly limestones (lower Rotzo Formation) that display sharp changes in thickness across the syn-sedimentary faults. This complex setting creates conditions potentially favorable to hydrocarbon accumulation. In this work, the Monte Testo structure is presented as a conceptual analogue of a hydrocarbon reservoir that may develop thanks to the overlap of the effects of extensional tectonics and climate change-induced modifications in the carbonate platform facies. A 3D geo-model was realized to obtain information about the genesis and tectonic evolution of the structure. Hence, a potential porosity distribution in the 3D model was evaluated showing that such extensional structure, which has a vertical extent of 500 m and covers an area of 15 km2, could have been associated to a total pore volume of 2.24 × 107 m3 at the time of its formation. Results suggest that in rifting contexts the combined effect of syn-sedimentary faulting and facies variations related to perturbations in the global carbon cycle could generate potential reservoirs in carbonate platforms. |
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| Keywords: | Syn-sedimentary tectonics 3D modeling Reservoir analogue Oolitic grainstones S-P event Trento Platform Early Jurassic |
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