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OFR 1983-02

Geochemical Studies - 1: Trace Elements in Alberta Crude Oils

Abstract: Twenty-two trace elements, determined by neutron activation techniques, are reported for 86 conventional crude oils and two crude oils from the Athabasca oil sand deposit, Alberta. When these crude oils are grouped into three families, based on previously studied hydrocarbon characteristics, analysis of variance indicates that S, Se, V, Ni, Br, Co and Zn can be used to differentiate, at a 90 percent confidence level, at least one of the families. These elements may therefore be an additional basis for distinguishing the crude oil families. Further study using multivariate methods are justified.It is suggested, tentatively, that crude oils with alkaline associated formation waters may be relatively depleted in Na, when compared to those with acidic associated formation waters. The contents of both Zn and V in crude oils may be related to the content of these elements in the source rocks. A geochemical model is presented for the occurrence of Br and I in formation waters and I in crude oils. These three geochemical observations, as well possible use of trace elements for the classification of crude oils into families, may be of value to explorationists and more study is justified. Place Keywords 72e 72l 72m 73d 73e 73l 73m 74d 74e 74l 74m 82g 82h 82i 82j 82n 82o 82p 83a 83b 83c 83d 83e 83f 83g 83h 83i 83j 83k 83l 83m 83n 83o 83p 84a 84b 84c 84d 84e 84f 84g 84h 84i 84j 84k 84l 84m 84n 84o 84p alberta athabasca oil sands canada Theme Keywords alkali metals antimony arsenic chromium cobalt crude oil europium gallium gold halogens iron manganese mercury nickel oil sand scandium selenium sulphur trace elements vanadium zinc

Hitchon, B.  Filby, R.H.  1983-04-30