Geochemical Investigation of Trace Elements in Crude Oil and Core Well Rocks of the Southern East in Iraq

The concentrations of trace metals in crude oil samples and core well rocks obtained from five oil fields: Halfaya, Noor, Amara, north, and south Buzurgan, were analyzed using an atomic absorption spectrophotometer. The results showed the ranges of the trace transition elements are in core well rocks in the order Ni (۴.۲۹۲-۷.۱۱۳ ppm), Fe (۲.۵۴۱-۴.۲۵۶ ppm), Zn (۰.۹۵۳- ۲.۰۵۶ ppm), Co (۱.۲۶۲-۱.۳۸ ppm), Cu (۰.۱۸۱-۱.۳۱ ppm), Cd (۰.۴۱۹-۰.۷۱ ppm), Mn (۰.۲۷۸- ۰.۳۸۷ ppm), Cr (۰.۲۱۷- ۰.۳۴۳ ppm), Pb (۲.۵۰۸- ۳۱.۳۳۳ ppm), Sn (۰.۱۴۹-۰.۵۳۷ ppm), the metalloid (۰.۱۰۵-۰.۲۱۲ ppm), the alkaline metals Ca (۱۴.۱۹- ۱۹.۳۱ ppm), Mg (۹.۲۰۵- ۱۰.۵۵ ppm), Ba (۳.۹۸۹-۶.۹۲۸ ppm), the alkali metals K (۷.۳۹۵-۱۳.۵۲ ppm), and Li (۰.۸۴۲- ۱.۱۳۴ ppm). While in crude oil , the order V was in the range (۲.۵۲۳- ۱۰۲.۷۴۱ ppm), Ni in the range (۲۰.۱۴۳-۲۸.۱۰۳ppm), Zn (۵.۱۴۲- ۸.۷۲۳ ppm), Fe (۲.۰۱۶- ۵.۸۷۲ ppm), Mn (۰.۷۵۶- ۱.۰۴۲ ppm), Co (۰.۴۸۳-۰.۹۲۴ ppm), Cu (۰.۲۸۳۰- ۰.۸۷۱ ppm), Cr (۰.۲۸۳- ۰.۷۳۱ ppm), Cd (۰.۱۸۷۰- ۰.۶۳۱ ppm), alkaline metals Ca (۴.۴۴۱- ۹.۴۲۴ ppm), Mg (۳.۸۶۹-۹.۷۲۴ ppm), Ba (۲.۲۱۱- ۳.۷۹۲ ppm), alkali metals K (۴.۱۲۲- ۶.۶۳۱ ppm), and Li (۲.۱۷۵-۴.۸۹۷ ppm). The post-transition metals Pb was in the range of (۳.۶۳۱-۹.۸۹۲ ppm), Sn (۰.۱۸۹-۰.۳۱۲ ppm), and metalloid in the range of (۰.۱۰۶-۰.۲۵۲ ppm). Trace element ratios Ca/Mg, Mg/Ca, Mn/Ca, and Cr/Ni, were used to unravel the genetic correlation among the core well rocks and V/Ni, V/(V +Ni) ratios showed marine origin and oxic conditions of the crude oil.

Keywords:

Trace metals , Crude Oil , migration , fingerprint , Dolomitization , Core well rocks , Pearson Correlation