FIELD: geophysics. SUBSTANCE: electric and radioactive logging is carried out, clay radioactivity and resistance variation curves are plotted, trend lines are drawn. Natural radioactivity and resistance are normalized by aligning trends. Abnormalities are discriminated on aligned normalized curves and oil or gas content in underlying geological site is determined by degree of this abnormality. EFFECT: improved accuracy of prospecting. 2 cl, 2 dwg
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