PSI - Issue 59

Liubov Poberezhna et al. / Procedia Structural Integrity 59 (2024) 739–744 Liubov Poberezhna et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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Table 2. Chemical composition of the produced waters from the Karaykoziv deposit. Produced water Component concentration, (mg/l) Na + +K + Ca + Mg 2+ Cl – SO 4 2 – CO 2 ; ( НСО 3 – ) Probe 1 47336 35571 4256 148046 215 220 Probe 2 61159 20391 760 151977 592 214 Probe 3 64674 16171 4269 140342 505 525 Probe 4 1337.6 1604 18683.0 35500 6.58 134.2 Probe 5 1094.40 7214.4 19196.7 45388.8 107.8 146.6 Probe 6 40684.3 1032.38 5954.69 75301.1 513.55 597.8

Based on the results of the analysis, appropriate databases were formed, and electronic vector layers of the map were created. It is suggested that the assessment of the potential negative impact on nature-reserved areas be conducted according to the following algorithm: 1. Determine within which deposit or oil and gas prospective areas overlap/are located near nature-reserved areas; 2. Rank by the intensity of the impact on the environment according to the following principle:  Zone of direct influence (part of the nature-protected area within the boundaries of the active deposit). This is a high-risk zone (red zone);  Zone of indirect influence (part of the nature-reserved area outside the boundaries of the active deposit). This is a moderate to low-risk zone. It is proposed to divide this zone into 3 subzones according to the intensity of the potential influence of the distance from the center of the deposit:

I – up to 1 km – moderate risk zone (orange zone); II – 1-5 km – moderate to low risk (yellow zone); III – 5-10 km – low-risk zone (green-yellow zone). 3. Results and discussion

The chemical analysis of produced water showed that the main corrosive components are chlorides with sulfate impurities and dissolved carbon dioxide (mainly in the form of bicarbonate ions (Table 2)). Comparing the concentrations of corrosive components, we can distinguish the first three samples with the highest concentrations of chlorides and sulfates. The highest concentration of hydrocarbonates is observed in samples 3 and 6 (Fig. 1, a).