Physics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41..815i&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 41, Issue 6, pp.815-828
Physics
2
Scientific paper
Three fractions of organic matter: lipid (benzene:methanol-extractable), humic acid (alkali-extractable) and kerogen (residue) were extracted from a young marine sediment (Tanner Basin, offshore southern California) and heated for different times (5-116 hr) and temperatures (150°-410°C). The volatile (gases) and liquid products, as well as residual material, were then analyzed. On a weight basis, the lipid fraction produced 58% of the total identified n -alkanes, the kerogen fraction 41%, and the humic acid <1%. Whereas n -alkanes produced from lipid show a CPI > 1.0, those produced by thermal alteration of kerogen display a CPI < 1.0. The volatiles produced by heating the lipid and humic acid fractions were largely CO 2 and water, whereas those produced from heated kerogen also included methane, hydrogen gas and small amounts of C 2 -C 4 hydrocarbons. A mechanism for hydrocarbon production due to the thermal alteration of organic constituents of marine sediment is discussed.
Ishiwatari Masaki
Ishiwatari Ryoshi
Kaplan Isaac R.
Rohrback B. G.
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