Table 3.

Rock–Eval data.

Shale	S1	S2	S3	PC	RC	TOC	Tmax	HI	OI
Barnett
BGS	0.26	8.18	0.19	0.72	0.91	1.63	421	502	12
WL	0.24	8.22	0.24	0.70	0.96	1.66	421	495	14
Utica
BGS	0.18	0.52	0.13	0.06	0.22	0.28	450	186	48
WL	0.16	0.43	0.18	0.05	0.22	0.27	445	159	67
Marcellus
BGS	0.09	0.30	0.30	0.05	6.83	6.88	640	4.3	4.7
WL	0.24	0.37	0.29	0.05	6.48	6.53	609	5.7	4.4

S1—volatile hydrocarbon (HC) content, mg HC/g rock.

S2—thermally generated (cracked) hydrocarbon, mg HC/g rock.

S3—CO₂ content, mg CO₂/g rock.

PC—content of hydrocarbons volatilized and pyrolyzed, wt%.

RC—CO₂ generated during oxidation representing remaining carbon, wt%.

TOC = PC + RC, wt%.

HI—hydrogen index = S2 × 100/TOC, mg HC/g TOC.

OI—oxygen index = S3 × 100/TOC, mg CO₂/g TOC.

T_max—temperature at which maximum of peak S2 occurs.