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Book Chapter

Relationships between geomechanical properties and lithotypes in NW European chalks

By
FANNY DESCAMPS
FANNY DESCAMPS
UMONS, University of Mons, 20 place du Parc, 7000 Mons, Belgium
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OPHÉLIE FAŸ-GOMORD
OPHÉLIE FAŸ-GOMORD
Department of Earth and Environmental Sciences, KU Leuven, Katholieke Universiteit Leuven, Geology, Celestijnenlaan 200E, 3001 Heverlee, Belgium
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SARA VANDYCKE
SARA VANDYCKE
UMONS, University of Mons, 20 place du Parc, 7000 Mons, Belgium
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CHRISTIAN SCHROEDER
CHRISTIAN SCHROEDER
ULB, Université Libre de Bruxelles, 50 avenue Roosevelt, 1050 Brussels, Belgium
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RUDY SWENNEN
RUDY SWENNEN
Department of Earth and Environmental Sciences, KU Leuven, Katholieke Universiteit Leuven, Geology, Celestijnenlaan 200E, 3001 Heverlee, Belgium
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JEAN-PIERRE TSHIBANGU
JEAN-PIERRE TSHIBANGU
UMONS, University of Mons, 20 place du Parc, 7000 Mons, Belgium
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Published:
January 01, 2017

Abstract:

As a result of increasing interest in unconventional reservoirs, a wide range of sedimentary systems are now being investigated with regard to petroleum applications, including various tight chalk formations. We examined a wide variety of chalk samples from NW Europe (micritic, grainy, argillaceous, marl seam, cemented and silicified chalks) and investigated the relationships between their petrophysical properties, mechanical properties and associated microtextures and how diagenesis can affect these properties. A diagenesis index based on an evaluation of textural and diagenetic parameters was used to quantify the effect of global porosity-reducing diagenesis on the microtexture of chalks. We used petrographic and petrophysical measurements to determine the petrography, density, porosity, permeability and sonic velocity of the chalk samples and uniaxial compression experiments to assess their mechanical behaviour. Our dataset of >30 samples covers a wide range of values for these properties. We determined a linear porosity–permeability relationship controlled by the diagenesis index. Porosity influences the unconfined compressive strength and Young’s modulus, but our analyses suggest that the diagenesis of the studied lithologies provides us with a further understanding of the mechanical behaviour of chalks. Micritic and grainy chalks are associated with the lowest diagenesis index and exhibit the lowest strength, whereas the higher diagenesis indices observed for other microtextures correspond to higher compressive strengths.

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Contents

Geological Society, London, Special Publications

Geomechanics and Geology

Geological Society of London
Volume
458
ISBN electronic:
9781786203397
Publication date:
January 01, 2017

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