Water quality in the Agan River catchment (West Siberia, Russia) was assessed based on data obtained between 1993 and 2017 at 25 monitoring stations. The purpose of the research was to assess the impact of oil field development on the quality of surface waters. Monitoring stations were located in the oil fields characterized by various levels of impact, from “moderate” (number of wells < 0.5 per 1 km²) to “extreme” (number of wells > 1 per 1 km²). Comparisons with the thresholds indicated that metal (Ni, Hg Pb, Zn, Cu, Mn and Fe) concentrations exceeded the standard limits for fisheries in 10.8%, 14.5%, 22.3%, 24.7%, 54.7%, 88.6% and 99.2% of samples, respectively. The high contents of Mn, Fe and Cu can be generally regarded as the natural results of intensive leaching of elements from acid soils. The total petroleum hydrocarbons (TPH) value exceeds the threshold in 34.6% of samples. The water quality was estimated using the Canadian Council of Ministers of the Environment Water Quality Index (CCME WQI). The water quality of the Agan River catchment was classified as “poor” and “marginal”. The TPH values displayed a significant positive correlation with the density of wells and with the percentage of oil-contaminated lands. Positive correlations were found between Cl⁻ and the density of wells, the frequency of accidents and the area of contaminated lands. Trends of pollution are sensitive to changes of accident rate. The decrease in accident rate for the last decade resulted in declines in TPH and Cl concentrations.

中文翻译：

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俄罗斯石油工业对地表水水质的影响（以西西伯利亚阿甘河流域为例）

根据1993年至2017年之间在25个监测站获得的数据，对阿干河流域（俄罗斯西西伯利亚）的水质进行了评估。该研究的目的是评估油田开发对地表水质量的影响。监测站位于具有各种影响程度的油田中，从“中等”（每1 km ²的井数<0.5井）到“极端”（每1 km ²的井数> 1井））。与阈值的比较表明，金属（镍，汞，铅，锌，铜，锰和铁）的浓度分别超过渔业标准限值的10.8％，14.5％，22.3％，24.7％，54.7％，88.6％和99.2％样本。锰，铁和铜的含量高通常被认为是从酸性土壤中强化浸出元素的自然结果。总石油烃（TPH）值超过34.6％的样品阈值。水质使用加拿大环境部长理事会水质指数（CCME WQI）进行估算。阿干河流域的水质分为“差”和“边际”。TPH值与井的密度和受油污染的土地的百分比呈显着正相关。发现Cl之间存在正相关⁻以及井的密度，事故频发和受污染土地的面积。污染趋势对事故率的变化很敏感。过去十年事故率的下降导致TPH和Cl浓度下降。