Clarification of the structure of the Parfenov horizon based on generalization of the results of regional seismic surveys within the Angara–Lena oil and gas region

The results of regional geological exploration at the expense of the federal budget in the territory of the Angara–Lena oil and gas region from 2006 to 2017 are analyzed. Based on a comprehensive interpretation of data from geophysical surveys of wells and seismic surveys, relief maps of the roof of the Chora Formation, thicknesses and sandiness of the Parfenov gas-bearing horizon were updated. Based on the interpretation of a complex of GIS data, seismic exploration and deep drilling, a conclusion was made about the nature of the change in the sand content of the Parfenov gas-bearing horizon.