Study of the State of Surface Waters of the Northeast Caspian Sea During Development of Oil FieldsA. Kenzhegaliyev, D.K. Kulbatyrov, A.Sh. Kanbetov, A.K. Shakhmanova and A.A. AbilgaziyevaE3S Web Conf., 288 (2021) 01063DOI: https://doi.org/10.1051/e3sconf/202128801063