Supergene transformed naphthides: Peculiarities of trace-element composition

Available data on the transformation of naphthides (oils and bitumens) in various petroleum basins (PB) during supergene processes were generalized to reveal their characteristic features for more accurate prediction of pool preservation and commercial quality of oils as hydrocarbon raw material enr...

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Bibliographic Details
Published in:Geochemistry international 2014, Vol.52 (1), p.57-67
Main Author: Punanova, S. A.
Format: Article
Language:English
Subjects:
Basins
Bitumens
Brazil
Crude oil
Earth and Environmental Science
Earth Sciences
Enrichment
Geochemistry
Hydrocarbons
Metal concentrations
Nickel
Oil and gas fields
Oil wells
Organic matter
Petroleum engineering
Petroleum geology
Petroleum hydrocarbons
Sapropels
Trace elements
Vanadium
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Summary:Available data on the transformation of naphthides (oils and bitumens) in various petroleum basins (PB) during supergene processes were generalized to reveal their characteristic features for more accurate prediction of pool preservation and commercial quality of oils as hydrocarbon raw material enriched in economically significant toxic metals. Using petroleum basins of the United States, Canada, Brazil, Venezuela, Nigeria, Russia, Kazakhstan, and Turkmenia as examples, itwas demonstrated that trace-element concentrations and ratios as well as metalloporphyrin complexes (MPC), including vanadium (Vp) and nickel (Nip) ones, which are associated with heavy resinous-asphaltene components of oils, serve as geochemical criteria of supergene transformed fluids. During supergenesis, oils show differential enrichment in metals. Considerable enrichment in V, Ni, Co, Mo, Cr, and other trace elements as well as MPC were found in oils generated by sapropel organic matter (OM) and initially enriched in metals (deposits of the South Tatar arch of the Volga-Urals, Buzachi arch, Afghan-Tajik Basin, and Marakaibo petroleum province of Venezuela). Oils initially depleted in trace elements and usually generated by humic OM also show increase in trace elements, but their concentrations are 1–3 orders of magnitude lower than those in enriched oils (oil fields in the coastal basins of Nigeria and Brazil). It was shown that supergene transformed fluids are well deciphered on the basis of a complex use of hydrocarbon and trace element criteria.
ISSN:0016-7029
1556-1968
DOI:10.1134/S0016702913110086