Oil fields of Western Siberia with low-permeability reservoirs
I. G. YASHCHENKO
Institute of Petroleum Chemistry, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
Keywords: hard-to-recover oil, deposit, reservoir, permeability, oil and gas basin, depth, age
Abstract
The West Siberian oil and gas basin has large reserves of hard-to-recover oil from low-permeability reservoirs. The share of such reserves is more than 80 %, but less than 17 % is currently under development. Statistical analysis of the physicochemical properties and occurrence conditions has been carried out for hard-to-recover Western Siberian oils from deposits characterised by low permeability, the development of which will increase oil production in the region. A set including 1970 oil samples from 488 oilfields of the West Siberian oil and gas basin, taken from the database of the Institute of Petroleum Chemistry SB RAS, was used for analysis. The distribution of oilfields with low-permeability reservoirs in the basin is revealed, and the typification of oilfields with the reservoirs differing in permeability and porosity of rocks is presented. The lithological and stratigraphic distribution of low-permeable deposits of various types is shown. The features of physicochemical characteristics of oils and occurrence conditions have been revealed.
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