Pressure Release Disturbance in Simulated Marine Cores as Indicated by a Laboratory Gamma-Ray Densitometer

AB Chace

doi:10.1520/STP36335S

SYMPOSIA PAPER Published: 01 January 1985

STP36335S

Pressure Release Disturbance in Simulated Marine Cores as Indicated by a Laboratory Gamma-Ray Densitometer

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A gamma-ray density gage showed that under simulated marine conditions standard Ottawa sand decreased in bulk density as indicated by the closely related linear attenuation coefficient on release of 10.3-MPa (1500-psi) confining pressure. This simulated recovery of a marine core from a depth of 1050 m. Expansion of the sand samples in one holder continued an average of 17 h. Samples repressurized within 4 h regained their original density while those left unpressurized for over 5 h did not. Density variation in marine cores following retrieval is significant and results primarily from effervescence and expansion of gas bubbles.

Author Information

Chace, AB

Brown and Caldwell, Consulting Engineers, Walnut Creek, CA

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Details

Developed by Committee: D18

Pages: 154–165

DOI: 10.1520/STP36335S

ISBN-EB: 978-0-8031-4947-2

ISBN-13: 978-0-8031-0431-0

Pressure Release Disturbance in Simulated Marine Cores as Indicated by a Laboratory Gamma-Ray Densitometer

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