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In page Methane clathrate:

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In some regions (e.g., Gulf of Mexico, Joetsu Basin) methane in clathrates may be at least partially derive from thermal degradation of organic matter (e.g. petroleum generation), with oil even forming an exotic component within the hydrate itself that can be recovered when the hydrate is disassociated.[10][11][citation needed] The methane in clathrates typically has a biogenic isotopic signature and highly variable δ13C (−40 to −100‰), with an approximate average of about −65‰ .[12][citation needed][13][14][15] Below the zone of solid clathrates, large volumes of methane may form bubbles of free gas in the sediments.[8][16][17]