REMOTE ASSESSMENT OF PERMEABILITY - THERMAL DIFFUSIVITY OF CONSOLIDATED CLAY SEDIMENTS
The search for a suitable repository in which high level waste may be safely contained over long periods of time has directed attention towards geophysical techniques as a non-destructive tool with the potential of measuring the in situ state of the deep ocean floor, both laterally and vertically. In an attempt to evaluate the usefulness of geophysical techniques in predicting the parameters, permeability and thermal diffusivity a laboratory uniaxial consolidation cell has been modified to allow simultaneous geophysical measurements (P-wave, S-wave, electrical resistivity, thermal conductivity) during a standard consolidation test. Results for nine surface sediment samples and four from depth in the sediment column suggest that permeability may be estimated to within an order of magnitude using compressional wave velocity measurements in a theoretical model based on Biot's equations. Thermal diffusivity may be assessed through the porosity of a sample, this is turn may be predicted from electrical formation factor measurements. The overall accuracies of the predictions are difficult to assess. The predictive methods identified require testing in an in situ environment but can be done initially on land at a fraction of the cost of marine operations.
Bibliographic Reference: EUR 9206 EN (1984) FS, 167 P., BFR 550, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989123100700 / Last updated on: 1987-01-01
Available languages: en