GHASTLI is able to produce pressure and temperature conditions that simulate the natural environment. Gas hydrate can either be formed in: (1) undisturbed natural sediment, (2) reconstituted natural sediment, or (3) artificial material; and field samples containing natural-gas hydrate can be preserved. Physical properties, including acoustic velocity, shear strength, permeability, and electrical resistivity are measured at different times during testing to ascertain the effect that gas hydrate has on the bulk physical properties of the host sediment. Those physical properties are used in models that estimate the amount of gas hydrate present in situ, for seafloor and well stability calculations, and for comparison to well logs.

Acknowledgements: The authors thank Dave Twichell and Richie Williams for their helpful reviews.

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