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Biot's coefficient as an indicator of strength and porosity reduction: Calcareous sediments from Kerguelen Plateau
- Source :
-
Journal of Petroleum Science & Engineering . Feb2010, Vol. 70 Issue 3/4, p282-297. 16p. - Publication Year :
- 2010
-
Abstract
- 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. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09204105
- Volume :
- 70
- Issue :
- 3/4
- Database :
- Academic Search Index
- Journal :
- Journal of Petroleum Science & Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 47610774
- Full Text :
- https://doi.org/10.1016/j.petrol.2009.11.021