In the Western Siberia oil and gas mega province, the main part of oil and gas reserves and resources is accumulated in Cretaceous and Jurassic deposits of the plate complex. However, the discovery of large oil deposits in the oil fields in the pre-Jurassic series of the western part of Khanty-Mansiisk autonomous district (Yugra) – in Elizarov trough and in the territory of its conjunction with Krasnoleninsky dome - increases the oil potential of the pre-Jurassic series.
High uncertainty of prediction of reservoir properties of individual blocks, different in terms of age and lithological composition (as confirmed by the results of core studies in the laboratories) represents an important factor which makes it difficult to plan exploration activities targeting the horizons of pre-Jurassic series. Reservoir properties prediction is also complicated by significant inconsistency in pre-Jurassic series' coverage by drilling and by petrographic and petrophysical core studies.
The present article examines a method of probabilistic evaluation of reservoir properties of pre-Jurassic deposits on the basis of integration of field geophysical data (magnetic measurements, gravity surveys, electric prospecting, and seismic survey) and examination of lithological and stratigraphic data and core studies results. It is also proposed to use computational and analytical method to evaluate porosity because the information on the reservoir development areas obtained by direct methods is not sufficient.
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