IN THE FIGURE Different pore-scale habits are obtained depending upon the hydrate formation mechanism. In the grain cementing case (left), sediment grains (orange shading) are cemented together by hydrate (gray hatched), with the pore space (blue) mostly free of hydrate. Grain cementing tends to occur when hydrate samples are formed from free gas plus liquid water (sediment grains can be partially or fully water saturated) (Kneafsey, 2009; Waite et al.,2009). In the pore-filling case (right), hydrate (gray hatched) forms in the pore space. Pore filling tends to occur when hydrate is formed from gas dissolved in liquid water (Kneafsey, 2009; Waite et al., 2009).

Image Credit: Timothy Kneafsey, Lawrence Berkeley National Laboratory.

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