Table 5 Chemical and stable isotopic composition of the gas retrieved from Satigny

(100 µl)

(200 µl)

–

–

(average)–

CO

(Vol%)

0

0

CO₂

(Vol%)

0

0

O₂ + Ar

(Vol%)

3.16

4.09

–

–

–

Nitrogen

(Vol%)

11.55

14.86

–

–

–

vol. % in 100 μL

vol. % in 200 μL

% C1–C6

Methane

(ppm)

2660

6114

53.2

61.14

98.87

Ethane

(ppm)

14.8

34.5

0.3

0.35

0.55

Propane

(ppm)

6.5

14.7

0.13

0.15

0.24

i-Butane

(ppm)

4.9

11.2

0.1

0.11

0.18

n-Butane

(ppm)

1.6

3.7

0.03

0.04

0.06

i-Pentane

(ppm)

1.1

2.6

0.02

0.03

0.04

n-Pentane

(ppm)

0

0.6

0

0.01

0.00

i-Hexane

(ppm)

1.5

1.6

0.03

0.02

0.04

n-Hexane

(ppm)

0.4

0.5

0.01

0.01

0.01

C1/(C2 + C3)

125

124

δ¹³C-CH₄

(‰ VPDB)

− 52.5

–

δ¹³C-C₂H₆

(‰ VPDB)

–

− 23.5

δ¹³C-C₃H₈

(‰ VPDB)

–

− 21.4

δ²H-CH₄

(‰ SMOW)

–

− 231