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Oil
and Gas Exploration in
Kontorovich, A.E., Yu F. Filippov, L.M. Burshtein, V.A. Kontorovich, Institute of Petroleum Geology, Novosibirsk, Russia
The new Predyenisey subprovince, whose
petroleum potential could be related to Upper Proterozoic-Paleozoic
deposits, has been substantiated. Seismic exploration and deep drilling data
allow prediction of a wide development of thick (to 10-12 km) Upper Proterozoic-Paleozoic sedimentary platform complexes,
composed of the Riphean, Vendian,
and Cambrian formations, similar in composition and degree of dislocation to
the coetaneous strata in the western part of the Siberian Platform. High
petroleum prospects of pre-Mesozoic deposits were proved by direct oil
indications. One of the ` `wells exhibits shows of oil which is similar in
biomarker hydrocarbons to oils of the giant Yurubchen-Tokhomskoye
field located in the western Siberian Platform. Geochemical studies of oil samples
in the accumulations and in formation waters proved that migration and
accumulation of hydrocarbons, occurred first in the
Paleozoic deposits of the left bank of the oil, identified in the section of one of the wells, to the
marine high-carbonaceous strata, their chemical composition has some features,
which indicate the Late Precambrian age of oil-generating deposits. The total
volume of sedimentary filling of the Upper Proterozoic-Paleozoic
sedimentary basin is above 2.2 million km3. The recoverable resources of the Predyenisey subprovince are
tentatively estimated at 500-5000 million tons of oil, 900-9000 billion m3 of
gas, and 5-60 million tons of condensate.
