Analysis of geothermal parameters in oil and gas fields in the northwestern part of the Dnieper-Donets Basin Usenko O.V., Institute of Geophysics of the NAS of Ukraine named after S.I. Subbotin. (Doctor of Geological Sciences, chief researcher) Usenko A.P. Institute of Geophysics NAS of Ukraine named after S.I. Subbotin, Kiev, (Doctor of Geological Sciences, chief researcher) S.I.Subbotin, Kiev, (technician) The book is devoted to the study of the dependence of temperature parameters (change in the geothermal gradient with depth), from hydrocarbon deposits at the same depths. The work is the first in the cycle, you can find the rest on the pages of the "Doklady" of the Academy of Sciences of Ukraine.