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Abstract

AAPG Bulletin, V. 102, No. 7 (July 2018), P. 1343-1377.

Copyright ©2018. The American Association of Petroleum Geologists. All rights reserved.

DOI: 10.1306/10181717058

The equivalent pore aspect ratio as a tool for pore type prediction in carbonate reservoirs

François Fournier,1 Matthieu Pellerin,2 Quentin Villeneuve,3 Thomas Teillet,4 Fei Hong,5 Emmanuelle Poli,6 Jean Borgomano,7 Philippe Léonide,8 and Alex Hairabian9

1Centre Européen de Recherche et d’Enseignement des Géosciences de l’Environnement, Aix-Marseille University, Centre National de la Recherche Scientifique, Institut de Recherche pour le Développement, College de France, case 67, 3, Place Victor Hugo, F-13331 Marseille, France; [email protected]
2Total E&P Americas, LLC, 1201 Louisiana Street, Suite 1800, Houston, Texas 77002; [email protected]
3Centre Européen de Recherche et d’Enseignement des Géosciences de l’Environnement, Aix-Marseille University, Centre National de la Recherche Scientifique, Institut de Recherche pour le Développement, College de France, case 67, 3, Place Victor Hugo, F-13331 Marseille, France; [email protected]
4Centre Européen de Recherche et d’Enseignement des Géosciences de l’Environnement, Aix-Marseille University, Centre National de la Recherche Scientifique, Institut de Recherche pour le Développement, College de France, case 67, 3, Place Victor Hugo, F-13331 Marseille, France; [email protected]
5Total E&P Recherche & Development, Avenue Larribau, F-64000 Pau, France; [email protected]
6Total E&P Recherche & Development, Avenue Larribau, F-64000 Pau, France; [email protected]
7Centre Européen de Recherche et d’Enseignement des Géosciences de l’Environnement, Aix-Marseille University, Centre National de la Recherche Scientifique, Institut de Recherche pour le Développement, College de France, case 67, 3, Place Victor Hugo, F-13331 Marseille, France; [email protected]
8Centre Européen de Recherche et d’Enseignement des Géosciences de l’Environnement, Aix-Marseille University, Centre National de la Recherche Scientifique, Institut de Recherche pour le Développement, College de France, case 67, 3, Place Victor Hugo, F-13331 Marseille, France; [email protected]
9Centre Européen de Recherche et d’Enseignement des Géosciences de l’Environnement, Aix-Marseille University, Centre National de la Recherche Scientifique, Institut de Recherche pour le Développement, College de France, case 67, 3, Place Victor Hugo, F-13331 Marseille, France; [email protected]

ABSTRACT

The equivalent pore aspect ratio provides a tool to detect pore types by combining compressional and shear wave velocities, porosity, bulk density, and mineralogical composition of carbonate rocks. The integration of laboratory measurements, well logs, and petrographic analysis of carbonate rocks from various depositional and diagenetic settings (Lower Cretaceous presalt nonmarine carbonates from offshore Brazil; Lower Cretaceous shallow-water platform carbonates from southeast France; and Upper Cretaceous deep-water carbonate from the Gargano Peninsula, Italy) allowed the acoustic signature of a wide range of pore types to be quantified. The equivalent pore aspect ratios are shown to be independent of pore volume and mineralogy. They can, therefore, be regarded as relevant parameters for discriminating selected pore network architectures in carbonate reservoirs. Interparticle and intercrystalline microporosity and macroporosity may include a variety of distinct pore network structures and a wide range of acoustic signatures depending on particle shape, nature of contacts, packing, and cementation (intergranular macroporosity in a densely packed granular sediment, secondary pseudofenestral, etc.). The acoustic response of moldic pores appears to be mainly controlled by the shape of the dissolved allochems. The present work reveals also that correct pore type detection from acoustic and porosity measurements is highly dependent on the pore type classification used. A selection of petrographic and diagenetic features to be considered for the construction of a suitable pore type classification is proposed to improve the detection of the pore type effect on the acoustic properties of carbonate reservoirs at plug and well log scale.

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