EGEL
Energy GeoEngineering Laboratory

Geotechnical Characterization Of Gulf Of Mexico Sediments

Geotechnical Characterization Of Gulf Of Mexico Sediments

​Yun, T., Narsilio, G. A., and Santamarina, J. C. (2006b). "Geotechnical Characterization Of Gulf Of Mexico Sediments." Marine and Petroleum Geology, Vol. 23, pp. 893-900
Tae Sup Yun, Guillermo A. Narsilio, J. Carlos Santamarina
Gulf of Mexico; Sediments; Shear wave velocity; Stiffness; Strength; Electrical conductivity
2006
Seventy whole rounds from conventional cores obtained during drilling to 300 mbsf at Atwater Valley and Keathley Canyon in the Gulf of Mexico in April and May 2005 were tested to determine geophysical and geomechanical parameters (liquid and plastic limit, porosity, specific surface, pH, sediment electrical conductivity, P- and S-wave velocities and undrained shear strength). Available data from a pressure core are included as well. Results show that the sediments are high specific surface plastic clays, and exhibit pronounced time-dependent stiffness recovery. Strains during coring disturb specimens, yet, the water content retains the effective stress history and permits gaining stiffness and strength information from conventional cores. Remolding is exacerbated when gas expands upon decompression; the limited pressure core data available show the advantages of preserving the pore fluid pressure during core recovery and testing. Valuable parameters for sediment characterization and engineering analysis are extracted from the data using pre-existing soil models.