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- Title
Trace elements and Sr isotopes in the crude oils from the Sakhalin offshore fields.
- Authors
Rasskazov, S.; Yasnygina, T.; Markova, M.; Saranina, E.; Fefelov, N.; Zharov, A.; Malykh, Yu.
- Abstract
Data on the concentrations of rare-earth elements and other metals in oils from Sakhalin fields were obtained by inductively coupled plasma mass spectrometry. The chemical preparation of the samples included the stages of acid digestion and ashing. In terms of the total metal contents; V, Ni, and Fe ratios; and Sr isotope ratios, the oil samples are divided into three groups. The crude oils from the extreme northeastern part of the island shelf, which are assigned to group I, differ from the other oils in the high contents of V and other metals, as well as the high V/Ni and V/Fe ratios. The crude oils of the group II fields located southward have elevated contents of REE and some other lithophile elements and moderate V/Ni and V/Fe ratios. Group III fields from the same area and from the Tatar Strait have low metal concentrations and low V/Ni and V/Fe ratios. The Sr/Sr ratio is comparatively low in the group II oil (0.70838-0.70858) and elevated in the group III oil (0.70854-0.70911). The Sr isotope ratio of the crude oils of the Kaigan-Vasyukan deposit (group I) originated from marine organic matter (0.70867-0.70884) is correlated with Sr/Sr ratios in sea-water with an age of 18.0-10.5 Ma. Based on the REE patterns, the V/Ni ratios, and the results of the multielement factor analysis, the crude oils of group III and, to a lesser extent, of group II are similar to the West Siberian crude oils.
- Subjects
SAKHALIN (Sakhalinskaia oblast', Russia); RUSSIA; PETROLEUM in submerged lands; PETROLEUM chemistry; RARE earth metals; TRACE elements; STRONTIUM isotopes; INDUCTIVELY coupled plasma mass spectrometry
- Publication
Russian Journal of Pacific Geology, 2015, Vol 9, Issue 2, p109
- ISSN
1819-7140
- Publication type
Article
- DOI
10.1134/S1819714015020074