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New insight into the microtexture of chalks from NMR analysis

An integrated petrographical and petrophysical study was carried out on a set of 35 outcrop chalk samples, covering a wide range of lithologies and textures. In this study various chalk rock-types have been characterized, in terms of microtextures and porous network, by integrating both geological,...

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Published in:Marine and petroleum geology 2016-08, Vol.75, p.252-271
Main Authors: Faÿ-Gomord, Ophélie, Soete, Jeroen, Katika, Konstantina, Galaup, Serge, Caline, Bruno, Descamps, Fanny, Lasseur, Eric, Fabricius, Ida Lykke, Saïag, Jessica, Swennen, Rudy, Vandycke, Sara
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cited_by cdi_FETCH-LOGICAL-a487t-ca709f79cb8ba158d76113c10afad0a66bda2ce1bd8746d51b362d9819c0666c3
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container_title Marine and petroleum geology
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creator Faÿ-Gomord, Ophélie
Soete, Jeroen
Katika, Konstantina
Galaup, Serge
Caline, Bruno
Descamps, Fanny
Lasseur, Eric
Fabricius, Ida Lykke
Saïag, Jessica
Swennen, Rudy
Vandycke, Sara
description An integrated petrographical and petrophysical study was carried out on a set of 35 outcrop chalk samples, covering a wide range of lithologies and textures. In this study various chalk rock-types have been characterized, in terms of microtextures and porous network, by integrating both geological, sediment-petrological and petrophysical data, including porosity, permeability, low-field NMR (Nuclear Magnetic Resonance), MICP and specific surface area (BET) measurements. The data allow an in depth understanding of the NMR signal of chalks, with a focus on tight chalks, including all low reservoir quality chalks independently of their sedimentological and/or diagenetic history. The study aims to develop an NMR-based approach to characterize a broad range of chalk samples. The provided laboratory low-field NMR chalk classification can be used as a guide to interpret NMR logging data. Based on the petrographical and petrophysical analysis, 6 groups of samples were identified, each of them characterized by a unique NMR signature: (1) micritic chalks, (2) grainy chalks, (3) cemented chalks, (4) marl-seam chalks, (5) argillaceous chalks and (6) silicified chalk. NMR T2 distributions were linked to pore body size and T2 logarithmic (T2lm) was calculated. It is apparent that tight chalks, whether their characteristics are sedimentological or diagenetic, yield smaller pore body sizes (T2lm  290 nm) and higher permeabilities (up to 13 mD). The marl-seam chalk samples yield bimodal T2 distributions, with a first peak related to the micritic matrix pores and a second peak related to intraparticle pores within fossils. For all samples, permeability was inferred from NMR spectra using SDR (Schlumberger Doll Research) model. •Low-field NMR T2 distributions allow to differentiate 5 chalk lithotypes.•Each lithotype displays distinct petrographical and petrophysical properties.•Main permeability-reducing factors in chalks: non-carbonate content and cements.•Bimodal NMR signal of marl-seams is related to intraparticle porosity preservation.•Permeability can be inferred from NMR measurements using the SDR model.
doi_str_mv 10.1016/j.marpetgeo.2016.04.019
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ispartof Marine and petroleum geology, 2016-08, Vol.75, p.252-271
issn 0264-8172
1873-4073
language eng
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subjects Calcium carbonate
Chalk
Earth Sciences
Marine
Marl-seams
MICP
Microporosity
Microtexture
NMR
Nuclear magnetic resonance
Permeability
Petrography
Petrophysics
Porecasts
Porosity
Sciences of the Universe
Texture
Throats
title New insight into the microtexture of chalks from NMR analysis
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