Evolution of groundwater chemical composition under human activity in an oilfield |
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| Authors: | A P Belousova S R Krainov B N Ryzhenko |
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| Institution: | (1) Water Problems Institute, Russian Academy of Sciences, 3 Gubkina Str. GSP-1, 117735 Moscow, Russia, RU;(2) All Russian Institute of Engineering Geology and Hydrogeology, 142452 Moscow region, Zeleniy, Russia, RU;(3) Institute of Geochemistry and Analytic Chemistry, Russian Academy of Sciences, 19 Kosigina Str., 117975 Moscow, Russia, RU |
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| Abstract: | Analysis and hydrogeochemical modeling of hydrocarbonate groundwater, including its buffering geochemical properties, have
demonstrated that this water has undergone a geochemical transformation almost throughout the whole of one industrial region.
It is known that hydrocarbonate groundwater possesses a high protective natural geochemical potential, supporting neutralization
of acid atmospheric precipitation. Natural hydrocarbonate water undergoes three stages of anthropogenic transformation caused
by acid atmospheric precipitation over more than 50 years. The first stage is transformation of neutral hydrocarbonate water
into alkaline water, accompanied by calcite precipitation and sodium carbonate dissolution from the unsaturated zone. The
second stage is transformation of alkaline water into neutral hydrocarbonate water; the hydrocarbonate content, being less
than the lower limit for background concentrations, showed reduced water buffering properties or protective potential relative
to acid precipitation. The third stage is transformation of neutral hydrocarbonate water into acidic water, with a complete
loss of protective geochemical potential.
This unfavorable ecological situation with natural geochemically hydrocarbonate groundwater shows that natural groundwater
less protected from the impact of acid atmospheric precipitation is in a worse ecological condition, which is confirmed by
observations in northern and Western Europe and other regions of the world.
Received: 30 October 1997 · Accepted: 23 March 1998 |
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| Keywords: | Alkaline/acid/neutral water Acid rain Geochemical modeling Brine Evolution |
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