FIELD: physics.
SUBSTANCE: magnetic and gravitational fields are measured in rift sedimentary basins. The obtained measurements are interpreted. Availability of acidic extrusive domes in the fundamental rock is indicated by coincidence of negative anomalies of the magnetic and gravitational fields. Test boreholes are drilled in places coinciding with the central zone of the extrusive domes. Radiation logging is performed in the boreholes while drilling. Drilling is performed until complete opening of the interval of bituminous argillaceous deposits in which, based on radiation logging data, the value of natural radioactivity is not less than 20 micro-roentgen per hour.
EFFECT: low drill footage.
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