Estimation of reserves of Tula horizon oil deposits of Severo-Yurmanskoye field, Perm kray

This article presents an estimation of reserves of the Tula horizon oil-bearing layers Tl 2-a and Tl 2-b at the Severo-Yurmanskoye oil field. Research was carried out in order to pros­pect the un-estimated oil reserves at the previously drilled but not commercially produc­ing areas of Perm kray. The opportunity of reserve calculation for this oil field was pro­vided by the sufficient oil encroachment rate achieved during testing of Tula horizon lay­ers in the borehole 174, reliable mapping of oil-bearing horizons using seismic and bore­hole data, existence of updated stratigraphic information, results of study of uniformity of oil-bearing layers throughout the area of the Severo-Yurmanskoye oil field, reliable esti­mate of the position of water-oil contact, defining the effective oil-bearing thickness of oil-bearing layers using results of borehole geophysical survey, study of lithological composition and reservoir properties, study of physical and chemical properties of oil in borehole and in laboratory, and reliability of statistical evaluation of oil recovery factor.