STATISTIC INTERPRETATION OF WELL LOGGING PARAMETERS TO REVEAL EPIGENETIC ALTERATIONS IN THE UPPER JURASSIC AND LOWER CRETACEOUS SANDSTONE STRATA AS INDICATORS OF THE SEALING PROPERTIES OF THE BAZHENOVSKAYA AND MARYANOVSKAYA FORMATIONS

I. A. Melnik, K. Yu. Smirnova

Tomsk Branch of the Siberian Research Institute of Geology, Geophysics and Mineral Resources, Tomsk, Russia

The paper considers the principles of statistic interpretation of well logging data, which can be used to estimate the intensity of secondary processes in sandstone intervals. It has been proved that the intensity of superimposed epigenesis can indicate the channels of deep fluid migration. The ratio of the average intensity of secondary kaolinisation of the Cretaceous sandstones to the average intensity of the same in the Jurassic strata depends on the seal quality (Bazhenovskaya and Maryanovskaya formations), and the presence or absence of faults and fractures therein.

Keywords: fluid migration, hydrocarbons, secondary kaolinisation, superimposed epigenesis, location of faults and fractures in seals, geophysical well logging.

DOI 10.20403/2078-0575-2017-3-58-66 

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