Petroleum Chemistry, Vol.49, No.4, 288-291, 2009
Trace elements in crude oil from some new South Caspian oil fields
The trace-elemental composition of crude oil from the new Azeri and Chirag South Caspian oil fields, as well as a stock-tank blend of low-wax oils from the May 28 field and Shakh-deniz condensate, was studied. The test oils from the Middle Pliocene producing horizon refer to the Apsheron-Prebalkhanian zone, and the Shakh-deniz condensate is associated to the southeastern offshore continuation of central Apsheron. It was found that the concentration of trace elements is low in these hydrocarbon objects of study. Of metals, Fe, Ni, Mn, and Zn prevail and the amount of Mo and Cr is an order of magnitude lower; vanadium is present in insignificant amounts only in Azeri crude oil. For Balakhany onshore oil used as an example, it was shown that the compositions of trace elements of crude oil and condensate are close regardless of the oil field location (onshore or offshore). However, the concentration of trace elements noticeably decreases on passing from oils to condensate.