Computer Science
Scientific paper
Sep 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36..929a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 36, Issue 9, pp.929-938
Computer Science
1
Scientific paper
The vanadium and nickel concentrations in oil samples representing the various producing formations of the Iraqi oil fields are determined. Variations of V and Ni content of oils from different fields help establish their history of migration and accumulation. Concentrations vary sharply among the different fields. V ranges from 1.6 to 109 ppm and Ni from less than 0.7 to 26 ppm, whereas V and Ni in oils from different wells in the same producing formation are remarkably constant. In the Kirkuk field in the north, Upper/Middle Cretaceous oil contains 45 ppm V and 21 ppm Ni compared to 26 ppm V and 17 ppm Ni in the overlying Oligocene/Lower Miocene reservoirs. In the Zubair field in the south, oils from the second, third and fourth levels contain 57, 15 and 2 ppm V and 19.5, 8.9 and less than 0.7 ppm Ni respectively. The ratio V / Ni in oils from the different fields in the Kirkuk area is fairly uniform (1.4-2.1), indicating that these oils have a common origin or have originated from similar source environments. The path of migration of oil in the northern Iraq oil fields is clearly reflected by the variation in V and Ni. The results indicate that oil in northern Iraq originated during the Middle/Upper Cretaceous, and has migrated vertically to the Tertiary reservoirs where it is now found.
Al-Atyia M. J.
Al-Shahristani H.
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