Abstract.
The aim of this article is to study the geochemical characteristics of halogenic technosoils within oil and gas fields. The chemical composition of both аssociated waters (AWs) types, from the Ignatіvske oil and gas-condensate field and the Svyrydivske gas condensate field, was determined in the course of the study. Based on the composition, both AWs types refer to chloro-sodium brines but they differ significantly in salinity and content of particular components. Two types of technosoils have been investigated - chernozem ordinary ang dark grey. The AWs entry into soils has caused formation of specific technogenic alkali soils with different degree of salinization at both of the sites under study. The increased solution concentrations of ions brought in with the saline waters are responsible for selective accumulation of mobile fractions of separate alkaline and alkaline-earth metals in the soils.It has been found that Na+К+ has the highest concentration ratios in the profile of both the soil types concerned. Accumulation has been observed in the 30-60 cm layer. With an increase in the distance to the focus, concentration ratios decrease. Li+ has accumulated primarily in the arable layer of technosoils of dark grey soil. Destruction of the soil carbonates in response to acid waters has caused Rb+ and Cs+ leaching from the soil profile. Based on the ascending geochemical mobility, the triad of alkaline-earth elements in the impact focus is as follows: Sr→Ca→Mg and Mg → Ca → Sr for the periphery.
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