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Gradient indication and spatial analysis of heavy metal redistribution in soils of the Surgil gas field (Aral sea region, Uzbekistan)

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Author Affiliations

  • 1Karakalpak Scientific Research Institute of Natural Sciences, Nukus, Uzbekistan
  • 2Karakalpak Scientific Research Institute of Natural Sciences, Nukus, Uzbekistan
  • 3Karakalpak State University, Karakalpak Scientific Research Institute of Natural Sciences, Nukus, Uzbekistan

Int. Res. J. Environment Sci., Volume 15, Issue (2), Pages 18-25, April,22 (2026)

Abstract

The article discusses the results of research on technogenic soil contamination at the Surgil natural gas field using local and translocal monitoring methods, gradient indication method, GIS technologies, and environmental risk indices. Such features of the Surgil gas fields (SGF) as industrial development on the freshly dried seabed, heterogeneous orography, insufficient phytoremediation conditions, and mesoclimatic changes have been identified. A generalized assessment of technogenic pollution was obtained both for individual drilling wells and for the entire SGF territory. It was established that the soils and ground near boreholes are technically practically uncontaminated by cyanides and biogenic elements, slightly contaminated by mineral salts and trace elements of nickel and chromium, moderately contaminated by arsenic and trace elements of cadmium and zinc. The content of selenium and lead ranges from moderate to severe pollution. Soil-grounds are heavily contaminated with copper microelements. The content of heavy metal microelements in soil and soils on SGF poses a low environmental risk for the environment, except for cadmium, whose RI index increases significantly from 2011 to very high in 2022.

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