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Minerals Report - International Seabed Authority

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The introduction of higher molecular-weight gases (ethane or<br />

propane) to the methane allows hydrate gas mixture to form at lower<br />

pressures and therefore to be stable in shallower water or at higher<br />

temperature (Kvenvolden, 1993). However, the presence of salts in pore water<br />

shifts the gas hydrate phase boundary to the left and decreases the gas<br />

hydrate stability area, requiring deeper and or colder conditions for formation<br />

and accumulation in marine environments.<br />

4.7.3 Where marine gas hydrate deposits are found<br />

Figure 27 shows the world wide locations of known all known gas<br />

hydrates (Max, 1990; Lee et al., 1994; Kesler, 1994).<br />

IINTERNATIONAL SEABED AUTHORITY 729

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