کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1755851 | 1522869 | 2010 | 16 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Biot's coefficient as an indicator of strength and porosity reduction: Calcareous sediments from Kerguelen Plateau Biot's coefficient as an indicator of strength and porosity reduction: Calcareous sediments from Kerguelen Plateau](/preview/png/1755851.png)
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.
Journal: Journal of Petroleum Science and Engineering - Volume 70, Issues 3–4, February 2010, Pages 282–297