Hydrochemical Data Report from Sampling of Two deep Abandoned Hydrocarbon Exploration Wells: Byelii Yar and Parabel’, Tomsk oblast’, Western Siberia, Russian Federation

Banks, D. , Frank, Y., Kadnikov, V., Karnachuk, O., Watts, M., Boyce, A. and Frengstad, B. (2014) Hydrochemical Data Report from Sampling of Two deep Abandoned Hydrocarbon Exploration Wells: Byelii Yar and Parabel’, Tomsk oblast’, Western Siberia, Russian Federation. Technical Report. Norges geologiske undersøkelse, Trondheim, Norway.

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Publisher's URL: http://www.ngu.no/upload/Publikasjoner/Rapporter/2014/2014_034.pdf

Abstract

This report documents the hydrochemical analyses performed on water samples collected during a field expedition in August 2013 to two former hydrocarbon exploration boreholes (>2 km deep) in the West Siberian artesian megabasin. The sample sites were at Byelii Yar and at Goryachii Istochnik (near Parabel’), both in Tomsk oblast’. In neither case did the boreholes encounter significant hydrocarbon reserves; they currently overflow under artesian pressure at the surface and their geothermal water is used in simple spa resorts. In both cases, the waters are highly reducing; they contain H2S and methane (CH4) as dissolved gases, and do not contain detectable concentrations of sulphate and nitrate. Both waters are rich in barium (an indicator of sulphate reduction) and strontium (an indicator of long residence time).<p></p> The Byelii Yar borehole yields brackish water (mineralisation 1.8 g/L) of Na-Cl type. The water is rich in strontium and very poor in Ca and Mg. The water contains around 11.5 mg/L fluoride, rendering it unsuitable for human consumption on a regular basis. The Br/Cl ratio of the water suggests that the salt content is marine-derived (possibly marine connate water, or derived from a subsequent marine inundation). The water’s salinity suggests only a 4-5% contribution of marine water, however. The stable isotope signature of the water indicates that the majority of the water is derived from direct or indirect recharge of meteoric water.<p></p> The Goryachii Istochnik borehole yields saline water (mineralisation 14 g/L) of Na-Cl-(Ca) type. The water is rich in strontium and very poor in Mg. The water contains around 120-130 µg/L arsenic, rendering it unsuitable for human consumption. The Br/Cl and Na/Cl ratios of the water suggest that the salt content is marine-derived (possibly marine connate water, or derived from a subsequent marine inundation). The water’s salinity suggests a 40% contribution of marine water. The stable isotope signature of the water indicates that the marine-derived water is likely to have mixed with fresher water derived from direct or indirect recharge of meteoric water. The stable isotope signature has been somewhat enriched in 18O, probably due to exchange with the aquifer matrix.<p></p>

Item Type:Research Reports or Papers (Technical Report)
Status:Published
Glasgow Author(s) Enlighten ID:Boyce, Professor Adrian and Banks, Mr David
Authors: Banks, D., Frank, Y., Kadnikov, V., Karnachuk, O., Watts, M., Boyce, A., and Frengstad, B.
Subjects:Q Science > QD Chemistry
Q Science > QE Geology
College/School:College of Science and Engineering > School of Engineering
Publisher:Norges geologiske undersøkelse
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