TY JOUR TI Assessment of electrical properties of rocks based on velocity analysis of electromagnetic CDP data KW electromagnetic CDP KW deep GPR KW electrical resistivity KW virtual well JO Russian Journal of Earth Sciences AU Gulevich, O.A. AU Volkomirskaya, L.B. AU Kaygorodov, E.P. PY 2025 IS 25 PB Geophysical Center of the Russian Academy of Sciences