DEEPLY SUBSIDED LOWER JURASSIC UNITS IN THE NORTH OF THE WEST SIBERIAN OIL AND GAS PROVINCE: CRITERIA AND EVALUATION OF PETROLEUM POTENTIAL
G. G. Shemin, A. Yu. Nekhaev, V. O. Krasavchikov, L. V. Ryabkova, A. N. Fomin, G. F. Bukreeva, L. G. Vakulenko, S. V. Zinov'ev, D. V. Kosyakov, P. S. Lapin, A. M. Brekhuntsov, V. S. Bochkarev, N. P. Deshchenya, and B. L. Urasinov
Keywords: Reservoir, sealing bed, permeable complex, catagenesis, oil source rocks, reservoir rocks, porosity, permeability, oil potential
Pages: 1107-1123
Abstract
To predict the petroleum potential, we used stratigraphic, tectonic, lithologo-facies, and geochemical criteria. We have considered their significance and estimated the petroleum potential from a total of criteria. The structures of the Toarcian, Pliensbachian, and Hettangian-Sinemurian regional reservoirs of the Lower Jurassic have been characterized. The low petroleum potential of the reservoirs is due to the following factors: intricate structure, low and very low values of capacity-filtration parameters of reservoir rocks, widespread sealing beds of poor and very poor quality, low oil-generating potential of oil source rocks, and a high degree of catagenetic transformation of OM, as well as nearly ubiquitous saturation of reservoirs with formational waters.
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