Development and distribution of bed-parallel compaction bands and pressure solution seams in carbonates (Bolognano Formation,Majella Mountain,Italy) |
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| Institution: | 1. Geology Division, School of Science and Technology, University of Camerino, Via Gentile III da Varano, 62032 Camerino, Macerata, Italy;2. Department of Geological Sciences, University of Basilicata, Potenza, Italy;3. Shell Italia E&P, Rome, Italy;1. Laboratoire Biogeosciences, UMR/CNRS 6282, Université de Bourgogne, 6 Bd Gabriel, 21000 Dijon, France;2. GDF Suez, Exploration Production International, 1 Place Samuel de Champlain – Faubourg de l''Arche 92930 Paris La Défense Cedex, France;1. School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom;2. Badley Geoscience Ltd, North Beck House, North Beck Lane, Hundleby, Spilsby, Lincolnshire, PE23 5NB, United Kingdom;1. EA 4592 Georessources et Environnement, ENSEGID-Bordeaux INP, Avenue des Facultés, 33400, Talence, France;2. Earth and Environmental Siences, KU Leuven, Celestijnenlaan 200 E, B 3001, Heverlee, Belgium;1. Institute of Earth Sciences, The Hebrew University, Jerusalem 91904, Israel;2. ExxonMobil Upstream Research Company, Houston, TX 77027, USA;3. Institut de Physique du Globe de Strasbourg, University of Strasbourg/EOST, CNRS, 5 rue Descartes, F-67084 Strasbourg Cedex, France;4. Centre for Advanced Study at The Norwegian Academy of Science and Letters, Drammensveien 78, 0271 N Oslo, Norway;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, PR China;2. College of Geosciences, China University of Petroleum, Beijing, 102249, PR China;3. Exploration and Development Research Institute of Sinopec Shanghai Offshore Oil & Gas Company, Shanghai, 200120, PR China;4. No.12 Oil Production Plant of Petro China Changqing Oilfield Company, Qingyang, 710018, PR China;5. College of Sciences, China University of Petroleum, Beijing, 102249, PR China;1. Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China;3. Department of Geology and Geophysics, Yale University, New Haven, CT 06511, USA;4. Department of Earth, Ocean and Ecological Sciences, School of Environmental Sciences, University of Liverpool, Liverpool, L69 3GP, UK;5. PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023, China |
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| Abstract: | The Oligo-Miocene carbonates pertaining to the Bolognano Formation, cropping out at the Majella Mountain, Italy, are diffusely crosscut by bed-parallel structural elements such as compaction bands and pressure solution seams. These bed-parallel structural elements formed under a vertical loading, during the progressive burial of the carbonates. The present work focuses on the control exerted on their development and distribution by compositional, sedimentological and pore network characteristics of the studied carbonates. The main results are consistent with the following statements: (i) bed-parallel compaction bands developed only within the poorly cemented, porous grainstones (2D porosity > 10%; 3D porosity > 15%); (ii) distribution of these bands was strongly controlled by both sorting and sphericity of the carbonate grains, as well as by the amount of intergranular macroporosity; (iii) bed-parallel pressure solution seams formed, mainly, within the fine-grained packstones, which are characterized by small amounts of clayish matrix (2–4% of total rock volume), and well-sorted, spherical carbonate grains.Considering the impact that burial-related, bed-parallel structures may have on fluid flow, the results provided in this contribution can help the management of subsurface geofluids, and overall prediction of carbonate reservoir quality, by mapping/simulating/assessing carbonate facies. |
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