Sediments with Hydrates Typically Have Low Contents of Biogenic Methane

2 Sediments with Hydrates Typically Have Low Contents of Biogenic Methane 

The rule of thumb in the title is shown in the following six points, which comprise the subsections of 7.2  

As a heuristic, methane availability limits hydrate formation in reserves. 

Of the two sources of methane (biogenic and thermogenic) in natural hydrates, most of the gas is biogenic, that is, from bacterially generated methane, with anecdotal exceptions. 

The biogenic methane is generated from anaerobic degradation, accompanied by a sulfate-methane interface (SMI), which can be used to determine the upper boundary of hydrate formation depth (Pauli et al., 2005). 

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