Table 3 Rollover extents for carbon isotopes (δ13C ‰ PDB) of gas components.

From: Isothermal confined pyrolysis on source rock and kerogens in the presence and absence of water: Implication in isotopic rollover in shale gases

Samples

Lucaogou

Lucaogou

Lucaogou

Saergan

Saergan

Saergan

Wuerhe

Wuerhe

Fengcheng

Fengcheng

Water/TOC

0

2

4

0

2

4

0

2

0

2

δ13C1 C

N

1.5‰

1.4‰

N

N

N

N

N

N

N

δ13C2 C

1.3‰

3.3‰

2.2‰

N

N

N

1.5‰

1.0‰

1.4‰

1.2‰

δ13C2 I

5.3‰

8.6‰

6.0‰

—

—

—

4.0‰

6.1‰

8.4‰

5.8‰

δ13C3 C

0.7‰

1.0‰

1.2‰

N

N

N

0.6‰

N

0.7‰

N

δ13CCO2 C

—

—

—

1.5‰

1.9‰

1.2‰

0.8‰

1.0‰

1.2‰

2.1‰

  1. C: cumulative; Ι: instantaneous within a maturity interval of EASY%Ro 0.10; N: no clear rollover;—: not measured or calculated.
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