Skip Links

USGS - science for a changing world

Scientific Investigations Report 2008–5219

Models for Gas Hydrate-Bearing Sediments Inferred from Hydraulic Permeability and Elastic Velocities

By Myung W. Lee


Thumbnail of and link to report PDF (1.5 MB)

Elastic velocities and hydraulic permeability of gas hydrate-bearing sediments strongly depend on how gas hydrate accumulates in pore spaces and various gas hydrate accumulation models are proposed to predict physical property changes due to gas hydrate concentrations. Elastic velocities and permeability predicted from a cementation model differ noticeably from those from a pore-filling model. A nuclear magnetic resonance (NMR) log provides in-situ water-filled porosity and hydraulic permeability of gas hydrate-bearing sediments. To test the two competing models, the NMR log along with conventional logs such as velocity and resistivity logs acquired at the Mallik 5L-38 well, Mackenzie Delta, Canada, were analyzed. When the clay content is less than about 12 percent, the NMR porosity is “accurate” and the gas hydrate concentrations from the NMR log are comparable to those estimated from an electrical resistivity log. The variation of elastic velocities and relative permeability with respect to the gas hydrate concentration indicates that the dominant effect of gas hydrate in the pore space is the pore-filling characteristic.

Version 1.0

Posted December 2008

For additional information contact:

Team Chief Scientist,
USGS Central Energy Resources Box 25046, Mail Stop 939
Denver, CO 80225

World Wide Web: Central Energy Resources Team

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

Lee, M.W., 2008, Models for gas hydrate-bearing sediments inferred from hydraulic permeability and elastic velocities: U.S. Geological Survey Scientific Investigations Report 2008–5219, 14 p.




Principles of Nuclear Magnetic Resonance

Log Analysis

Theoretical Models



References Cited

Appendix A. Permeability Model

Appendix B. Cementation Theory

Appendix C. Three-Phase Biot-Type Equation

Accessibility FOIA Privacy Policies and Notices

Take Pride in America home page. FirstGov button U.S. Department of the Interior | U.S. Geological Survey
Questions or Assistance: Contact USGS
Last modified: Thursday, 10-Jan-2013 19:01:32 EST