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Usinskoye Field (Timan-Pechora Province) - Lower Serpukhovian Oil Pools Sealing and Scattering
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Fourth International Conference on Fault and Top Seals, Sep 2015, cp-462-00021
- ISBN: 978-94-6282-164-4
Abstract
The lower Serpukhovian oil pools of Usinskoye field are exposed to various ways of sealing – by regional anhydrite top seal, by faults. They have also different ways of scattering – through the hydrodynamic window in the top seal, when the anhydrites are replaced with carbonates, or through the gap in the top seal caused by the faults. Faults role is ambiguous – in the case of Usinskoye field they are partly sealing at the anhydrite intervals, and they are not at the carbonate intervals. That is they are increasing or even form oil pools on the uplifted sides because thick anhydrites of the forth bed overlay porous carbonates of the third and destroying oil pools if they are located on the lowered side and come into contact with permeable rocks. In our particular case the faults in general play positive role. The correctness of the hypothesis is verified by correspondence between the discovered controlling object and the level of hydrocarbon-water contact.