Figure F15. C1/C2 ratios of void gas samples as a function of depth at Sites 1252, 1244, and 1251. There is no offset in C1/C2 ratios of gas at the base of the hydrate stability zone (BHSZ) at Site 1252 because gas hydrates are absent or in low concentration. Significant offset at base of hydrate stability at Sites 1244 and 1251 are due to ethane fractionation during formation and decomposition of gas hydrates.

Figure F15. C₁/C₂ ratios of void gas samples as a function of depth at Sites 1252, 1244, and 1251. There is no offset in C₁/C₂ ratios of gas at the base of the hydrate stability zone (BHSZ) at Site 1252 because gas hydrates are absent or in low concentration. Significant offset at base of hydrate stability at Sites 1244 and 1251 are due to ethane fractionation during formation and decomposition of gas hydrates.