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Comparisons of compressional-sound velocity and its relationship to wet-bulk density from well-log data with those of laboratory data, from depths of 113 meters to 273 meters below sea floor in Miocene nannofossil marl and chalk, indicate that the porosities of laboratory samples are about 5 porosity units greater than those of in situ sediments (or on the logs). This is in agreement with predictions by Hamilton (1976) for porosity rebound with the release of overburden pressure. The electrical-resistivity relationship with porosity agrees well with the Archie (1942) type relationship. The models, in decreasing order of agreement are: Boyce (1968), Archie (1942), Kermabon et al. (1969), Winsauer et al. (1952), and Maxwell (1904). In general, acoustic anisotropy increases with age and depth. Anisotropy is typically 0 to 5 per cent (maximum of 14%) faster parallel to bedding in Tertiary sediments, from 0 to 661 meters below the sea floor, and typically 0 to 30 per cent in mainly Mesozoic sedimentary rock, from 661 to 1624 meters. Acoustic anisotropy is particularly significant (0.4 km/s or greater) when velocities are from 2.0 to 4.2 km/s.

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Determination of the Relationships of Electrical Resistivity, Sound Velocity, and Density/Porosity of Sediment and Rock by Laboratory Techniques and Well Logs from Deep Sea Drilling Project Sites 415 and 416 off the Coast of Morocco