Biot's coefficient as an indicator of strength and porosity reduction: Calcareous sediments from Kerguelen Plateau

Mohammad Monzurul Alam, Mai Kirstine Borre, Ida Lykke Fabricius, Kathrine Hedegaard, Birte Røgen, Zakir Hossain, Anette Susanne Krogsbøll

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Chalk develops as a result of diagenesis of pelagic calcareous ooze. In a newly deposited ooze sediment, porosity ranges from 60% to 80% but porosity reduces with burial. We studied how different porosity reduction mechanisms change the strength of these deep sea carbonate-rich sediments and effect Biot's coefficient, β. In calcareous ooze, β is one. Mechanical compaction reduces porosity, but only leads to a minor decrease in β. Recrystallization renders particles smoother, but does not lead to reduction in β unless it gives rise to pore stiffening cementation. Pore stiffening cementation causes β to fall, even when porosity remains constant. Biot's coefficient correlates with strength-indicating properties: compressional and shear modulus, oedometer modulus, yield strength, strain from direct loading and creep strain. Our data indicate that β may be used for predicting the diagenetic process involved in porosity reduction and strengthening of chalk during burial diagenesis.
Original languageEnglish
JournalJournal of Petroleum Science and Engineering
Volume70
Issue number3-4
Pages (from-to)282-297
ISSN0920-4105
DOIs
Publication statusPublished - 2010

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