--> Abstract: Oil Presence in Lower Paleozoic within the Timan-Pechora Plate, by V. Bogatskiy, S. Danilevskiy, A. Martinov, and N. Nikonov; #90942 (1997).

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Abstract: Oil Presence in Lower Paleozoic within the Timan-Pechora Plate

BOGATSKIY, VLADIMIR, SERGEY DANILEVSKIY, ANDREY MARTINOV, NIKOLAY NIKONOV

Considerable HC resources attract attention to the deposits, related to the Ordovician-Lower Devonian structural stage, accommodated within the Timan-Pechora epibaikalian plate. The stage consists of the Lower and Middle Ordovician clastics and prevailing Middle Ordovician-Lower Devonian carbonates. The latter ones are responsible for presence of overall commercial oil. Within graben and pericraton Lower Paleozoic troughs during the Early Carboniferous oil generation kitchens were formed, where generation processes actively continued up to the Middle Late Triassic and in depth of 4.2-4.5 km were replaced by gas generation. Gas from the Lower Paleozoic rocks is very important in gas and gas condensate pools formation, as well as in oil migration. Oil genotypes generated from the Lower Paleozoic rocks have been identified in the Middle Devonian-Triassic deposits. This is interpreted by vertical migration along the faults within the Pechora-Kolva aulacogen and Varandey-Adzhva structural zone, as well as supply to the Middle Devonian sandstones, where they overlie the Lower Paleozoic reservoirs. Frequent tectonic movements within the Khoreyver depression and Varandey-Adzhva structural zone and due to those stratigraphic intervals have resulted in considerable degassing, thus explaining an absence of gas pools here. Over the area of the pericraton, buried at present under the Ural foredeep, the conditions to preserve gas were more favorable in the Lower Paleozoic, as well as upper, where gas could penetrate through the faults.

AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria