Perm Journal of Petroleum and Mining Engineering (Dec 2017)
Features of geological structure and formation of oil & gas deposits in the Vuktyl thrust fault region
Abstract
The paper is devoted to modeling of the processes of oil and gas deposits formation of the Vuktyl thrust development area, to which the largest in the Timan-Pechora oil and gas province is associated with the same oil and gas condensate deposit. Oil and gas of deeply buried formations of the autochthon of the overthrust region remains poorly studied. Therefore, application of modern methods of basin modeling is relevant for oil and gas content estimation. In order to simulate the section, Schlumberger PetroMod software package was used. The package allows to determine the history of generation of hydrocarbons on the geological time scale, migration paths, amount and type of oil and gas accumulations in both surface and reservoir conditions. Using the 1D and 2D modeling of the Vuktylskaya-58 parametric well and the overthrust region models were obtained. The models reflect the modern geological section, its evolution during the geological time. The processes of formation of oil and gas were studied. As a result, it was shown that the parent rocks of the allochthonous section part could not participate in the formation of the main gas-condensate deposit of the Vuktyl deposit because they entered only the main oil formation zone. In deeply buried deposits of the autochthon starting from the Permian and Triassic formation of the Vuktylsky gas-condensate field and possibly the deposits in poorly studied deep formations could be caused by processes of generation of gases and gas condensates. That is proved by the discovery of a large number of gas emergences beyond the 4-5 km in a section of the only well drilled beyond the 6 km such as Vuktylskaya-58. Generation and accumulation of gas hydrocarbons occurred mainly after the appearance of thrust dislocations, when the main traps were formed both at ordinary and high depths.
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