Low-temperature gas from marine shales: wet gas to dry gas over experimental time

Table 3 Gas compositions (% mol) in sequential closed reactions, Mowry Shale at 100°C

	1st hr	2nd hr	3rd hr	4th hr	next 24 hr	% var
Methane	0.77	1.80	11.21	19.89	53.13	2651
Ethane	0.27	0.49	3.38	9.33	16.25	783
Propane	5.69	3.61	4.50	8.96	12.06	176
i-Butane	13.89	11.56	9.98	5.66	2.48	243
n-Butane	21.39	15.87	12.48	10.15	7.82	208
i-Pentane	30.56	36.72	33.64	26.42	3.90	650
n-Pentane	27.41	29.95	24.82	19.59	4.37	488
μmol/g, cum	0.145	0.171	0.181	0.185	0.203
	Duplicate Reaction
	1st hr	2nd hr	3rd hr	4th hr	next 24 hr	% var
Methane	1.80	6.82	23.16	30.24	56.26	1973
Ethane	0.49	2.06	5.14	8.95	15.63	569
Propane	3.61	2.86	5.40	10.41	10.17	199
i-Butane	11.56	6.99	7.03	5.10	2.74	157
n-Butane	15.87	11.26	9.08	9.16	6.87	111
i-Pentane	36.72	37.10	29.82	20.41	4.24	737
n-Pentane	29.95	32.90	20.38	15.74	4.10	649
μmol/g, cum	0.320	0.370	0.389	0.394	0.410

Yields in μmol C₁-C₅/g are cumulative. Gas compositions represent gas generated during that period, not cumulative gas compositions. Total gas yield was 43 μg C₁-C₅/g for the first reaction and 65 μg C₁-C₅/g for the duplicate reaction. % var is the variance in compositions as % of mean. The average % variance for the seven hydrocarbons is 743% for the first reaction and 628% for the duplicate reaction.

ISSN: 1467-4866