Elastic properties of overpressured and unconsolidated sediments
Bulletin
2214
By: Myung W. Lee
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Abstract
Differential pressure affects elastic velocities and Poisson?s ratio of sediments in such a way that velocities increase as differential pressure increases. Overpressured zones in sediments can be detected by observing an increase in Poisson?s ratio with a corresponding drop in elastic velocities. In highly overpressured sands, such as shallow water flow sands, the P-to S-wave velocity ratio (Vp/Vs) is very high, on the order of 10 or higher, due to the unconsolidated and uncemented nature of sediments. In order to predict elastic characteristics of highly overpressured sands, Biot-Gassmann theory by Lee (BGTL) is used with a variable exponent n that depends on differential pressure and the degree of consolidation/compaction. The exponent n decreases as differential pressure and the degree of consolidation increases, and, as n decreases, velocity increases and Vp/Vs decreases. The predicted velocity ratio by BGTL agrees well with the measured velocity ratio at low differential pressure for unconsolidated sediments.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Elastic properties of overpressured and unconsolidated sediments |
| Series title | Bulletin |
| Series number | 2214 |
| DOI | 10.3133/b2214 |
| Edition | Version 1.0 |
| Year Published | 2003 |
| Language | ENGLISH |
| Description | 10 p. |
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