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Hydrocarbon gases associated with permafrost in the Mackenzie Delta, Northwest Territories, Canada

Applied Geochemistry

By:
and
DOI: 10.1016/S0883-2927(98)00087-0

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Abstract

Molecular and isotopic analyses of core gas samples from 3 permafrost research core holes (92GSCTAGLU, 92GSCKUMAK, 92GSCUNIPKAT; sample core depths ranging from 0.36 to 413.82 m) in the Mackenzie Delta of the Northwest Territories of Canada reveal the presence of hydrocarbon gases from both microbial and thermogenic sources. Analyses of most headspace and blended gas samples from the ice-bonded permafrost portion of the core holes yielded C1/(C2 + C3) hydrocarbon gas ratios and CH4-C isotopic compositions (??13C CH4) indicative of microbially sourced CH4 gas. However, near the base of ice-bonded permafrost and into the underlying non-frozen stratigraphic section, an increase in ethane (C2) concentrations, decreases in C1/(C2 + C3) hydrocarbon gas ratios, and CH4-C isotopic (??13C CH4) data indicate the presence of hydrocarbon gases derived from a thermogenic source. The thermogenic gas below permafrost in the Mackenzie Delta likely migrated from deeper hydrocarbon accumulations and/or directly from thermally mature hydrocarbon source rocks.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Hydrocarbon gases associated with permafrost in the Mackenzie Delta, Northwest Territories, Canada
Series title:
Applied Geochemistry
DOI:
10.1016/S0883-2927(98)00087-0
Volume
14
Issue:
5
Year Published:
1999
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Applied Geochemistry
First page:
607
Last page:
620
Number of Pages:
14