Computer Science
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49..299k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 49, Issue 1, pp.299-305
Computer Science
Scientific paper
Forty-nine samples from Mesozoic rocks of Northern Bulgaria and from recent marine muds of the Black Sea have been analyzed for fatty acids (FA), using extraction, treatment with ion exchange resin and gas chromatography. There is a higher concentration of normal (n) FA in the recent marine sediments, as well as in their bitumen extracts than in the rocks as a whole. There is twice as much n-FA in the rocks containing dispersed organic matter (DOM) formed mainly by benthonic organisms as compared to ancient sediments with planktonic DOM. The content of n-FA has decreased nine and five times, respectively in planktonic DOM in the sequence: limestones-marls-argillites and clayey siltstones, while the amount of organic carbon has risen four and two times. The n-FA are chiefly represented by C 16 and C 18 and in the recent sediments also by C 22 molecules. However when the level of maturity of DOM corresponds to the katagenetic degrees of MK 3 and MK 4 , maximum is in n-FA with 19 and 20 carbon atoms. A gradual decrease in the amount of the n-FA with even-numbered carbon atoms was noted as maturity of the planktonic DOM increases from early diagenesis in recent marine sediments to the katagenetic degrees of MK 3 and MK 4 in ancient rocks. The ratios FA / HC and FA / HC + FA have also decreased when the katagenetic maturity of DOM changes from PK 3 degree to MK 4 degree. These geochemical features may be used as an additional criterion in determining the principal phase of oil formation.
Kovachev Georgi
Kovacheva Iordanka
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