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Transcripción del abstract original del autor: This paper highlights new technologies for gas reserves assessments of Cenomanian and Achimovian deposits in Northern fields of West Siberia. There is shown the necessity of complex use of various geophysical information to single out the permeable formations in the sections of gas saturated Cenomanian deposits and to define their reservoir properties as per the data of the wells geophysical investigations. The paper presents the main milestones of determining calculation parameters for Achimovian hydrocarbons deposits of complicated structure. Theoretical aspects of sedimentological study for Achimovian deposits are reviewed. Suggested is the option of confining rocks genotypes typical for turbidity deposits to rocks lithotypes singled out on the basis of wells geophysical investigations (GIW).