Computer Science
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42.1181p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 42, Issue 8, pp.1181-1197
Computer Science
1
Scientific paper
A geochemical study has been made of fine clay minerals and organic matter in subsurface shale samples from the Canadian Northwest Territories. The mixed layer clays comprise smectite-vermiculite-illite but are transformed during thermal diagenesis to a pseudo-quaternary system (smectitevermiculite-illite-chlorite) by incorporation of amorphous inorganic material. The first clay dehydration occurs prior to hydrocarbon generation and is accompanied by adsorption of K + and substitution of Al 3+ for Si 4+ in the clay lattice. Vermiculite is an intermediary in the transformation of smectite to illite and in the presence of Ca 2+ ions delays the second dehydration step to the zone where cracking of liquid hydrocarbons to gas occurs. Hydrocarbon generation commences at a vitrinite reflectance level of 0.5% R 0 maximum in both amorphous and woody-herbaceous organic matter but does not reach a significant level in the latter case until reflectance levels of 0.7% R 0 maximum. The pristane to phytane ratio and proportion of n -alkanes and acyclic isoprenoids increase during hydrocarbon generation from woody-herbaceous organic matter. Anomalous hydrocarbon yields from certain samples are attributed to high concentrations of plant resins. Destructions of liquid hydrocarbons by cracking commences at a reflectance level of 1.0% R 0 maximum and is essentially complete by a reflectance level of 1.4% R 0 maximum. The proportion of n -alkanes in the saturates decreases during cracking of the liquid hydrocarbons.
Foscolos A. E.
Gunther P. R.
Powell Trevor G.
Snowdon L. R.
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