METHODS TO STUDY PALEOSOIC-MESOSOIC CONTACT ZONE BY THE EXAMPLE OF LITHOLOGIC-GEOPHYSICAL INVESTIGATIONS OF THE NORTHERN-OSTANINSKOYE OIL FIELD (TOMSK REGION)

A. V. Yezhova, V. P. Merkulov, V. A. Chekantsev

Seismic, gravity-magnetic, paleomagnetic and lithologic-stratigraphic investigations on pre-Jurassic formations of the Northern-Ostaninskoye oil field located in the southeastern West-Siberian petroleum province have been undertaken. A network of not unidirectional tectonic dislocations combined into Paleozoic basement destruction zones has been revealed. Material compositions and ages of pre-Jurassic formations within each tectonic block were estimated. A crucially new geological model of Paleozoic strata has been put forward: the Northern-Ostaninsky erosion-tectonic scarp is an inverted complex and cut by tectonic faults synclinal fold, with an oil pool being confined to its steeply dipping branch. An inverted morphostructure presented in erosiontectonic scarps can serve as a prospecting indicator for estimating Paleozoic hydrocarbon prospects.

Key words: seismic exploration, geophysical anomalies, inverted morphostructure, destruction zones, reservoir-rocks, oil field, Tomsk Region.

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