Petroleum hydrogeology of Bashkortostan represents the first results of determining the weight concentration of Cu, Ni, V, and Co in highly mineralized reservoir waters of oil and gas fields. The authors proposed atomic-absorption algorithm of determining the elements in graphite furnace with electrothermal atomization by standard addition method for samples with complex matrix structure. High selectivity and accuracy of this method allows to make measurements without preliminary sampling and get the results having low error of about 20%. The proposed method will allow to study highly mineralized reservoir waters of the upper Paleozoic cover of Bashkortostan with a view to their classification and possible selection of search features for the exploration of hydrocarbon.
The results obtained with the help of the proposed methodologic approach on the micro or trace elements quantities found in reservoir waters may be successfully applied as the basis for systematic classification of reservoir waters by metal content, for exploration and appraisal of oil and gas fields, for determining oil-water contact, for estimating rock porosity and permeability, for tracer tests and identification of new perspective areas for further evaluation. Moreover reservoir waters reflect their interaction with oil pools in the subsurface and in their turn influence the composition and properties of in-situ oil. The data on concentrations of such micro elements in produced fluids is also used for analysis of sources for water breakthrough to producing wells, for estimation of potential by-passed pay or oil-bearing intervals when planning new wells in underdeveloped zones, sidetrack drilling or recompletions.
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