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In case of upward, so in case of downward fluid migration, processes of superposed epigenesis perform and lead to secondary epigenetic transformations of rocks of passage Jurassic strata, which result in their anomalous geophysical and petrophysical characteristics. A generalizing comparative analysis of the geophysical and petrophysical characteristics of the Jurassic section of different field types in Tomsk Region was carried out: without petroleum potential in pre-Jurassic sequences, with commercial inflows from the pre-Jurassic structures. Results of exploration electrical resistivity and carbonatization in the Jurassic section of deep wells and also spontaneous potential variation, electrical resistivity and natural radioactivity in Bazhenov Formation confirm anomalousness of geophysical and petrophysical parameters of Jurassic rocks in case of pre-Jurassic sequences. This paper determines 6 geophysical and petrophysical characteristics of the Jurassic strata as predictive indicators for oil and gas potential estimation in pre-Jurassic section.

neftegazovaâ geologiâ. teoriâ i praktika

Comparative petrophysical characteristics of the Jurassic sections of the Tomsk Region fields (in relation to petroleum potential of pre-Jurassic sequences)