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

Abstract : The equivalent pore aspect ratios (EPAR) provide a tool to detect pore types by combining P-and S-wave velocities, porosity, bulk density and mineralogical composition of carbonate rocks. The integration of laboratory measurements, well log data and petrographic analysis of 468 carbonate samples from various depositional and diagenetic settings (Lower Cretaceous pre-salt non-marine carbonates from offshore Brazil, Lower Cretaceous shallow-water platform carbonates from SE 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 be therefore regarded as relevant parameters for discriminating selected pore network architectures in carbonate reservoirs displaying a wide range of porosity values and mineralogical compositions. Interparticle and intercrystalline micro-and macroporosity may include a variety of distinct pore network structures and a wide range of acoustic signatures depending on particle/crystal shape, nature of contacts, packing and cementation. 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.
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François Fournier, Matthieu Pellerin, Quentin Villeneuve, Thomas Teillet, Fei Hong, et al.. The equivalent pore aspect ratio as a tool for pore type prediction in carbonate reservoirs. AAPG Bulletin, American Association of Petroleum Geologists, In press, ⟨10.1306/10181717058⟩. ⟨hal-01739812⟩

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