TY JOUR TI Geostructural characteristics of the Astrakhan-Kalmyk part of the Caspian basin in the light of recent scientific research KW reservoir KW genesis KW tectonic plate KW lithospheric block KW sedimentary cover KW deposits KW deposit placement KW sed-imentation KW carbonate reservoir KW trough KW limestone KW sandstone KW salt dome KW formations KW mound JO Oil and gas technologies and environmental safety AU Duvanova, M.. AU Golchikova, N.N. AU Duvanov, A.. PY 2026 IS 2026 PB Astrakhan State Technical University