Multistage Alterations of Pre-Vendian Oil-Bearing Rocks of the Baikit Anteclise (Siberian Platform) Based on Rb-Sr and K-Ar Data

摘要

Riphean carbonate rocks of the Baikit Anteclise with hydrocarbon raw material reserves exhibit a complicated block structure. Therefore, correlation of sections of even adjacent wells and general understanding of the geological structure of the territory are extremely hampered. The problem becomes more complicated because of multiple epigenetic reworking of Riphean rocks. Study of Rb-Sr and K-Ar systems based on materials from three boreholes drilled on the Baikit Anteclise reveal at least three stages of such reworking dated at about 1400, 1000, and 700 Ma, respectively. Rocks of the whole penetrated pre-Vendian section are assumed to be Early Riphean or even pre-Riphean. Brines saturating them are likely to be related to Vendian-Cambrian saliferous rocks.