Biogenic CH4 (‰)

Thermogenic CH4 (‰)

Pyrogenic CH4 (‰)

δ13C-CH4: −110 to −50

δ2H-CH4: −275 to −100

δ13C-CH4: −50 to −20

δ2H-CH4: −275 to −100

δ13C-CH4: −25 to −13

[11] [12] [13]

[11] [13]

[14] [15]