FIELD: oil and gas industry.
SUBSTANCE: method for determining oil saturation as to core is characterised by the fact that from oil-saturated core of transient zone (TZ) of the deposit and limit oil saturation zone (LOSZ) of the deposit, which are characterised by different oil and water saturation, there made are standard cylindrical specimens. Then, manufactured specimens are extracted from oil contained in them, and porosity and permeability of each specimen is determined. After that, 100% formation water saturation of extracted specimens is performed. Then, using capillarimetry method at various drain pressures in specimens there simulated is water saturation that is similar to water saturation of various levels in TZ and LOSZ of the deposit. As per the capillarimetry data of each specimen, there built are capillary pressure Pc vs. water saturation curves. As per the obtained capillary pressure vs. water saturation curves of each specimen, there determined are heights h"пл" of various water saturation levels in the range of TZ and LOSZ of the deposit both above water surface (WS) of the deposit, which is characterised with 100% water saturation, and above level of water-oil contact (WOC) of the deposit. Then, relationship between residual water saturation Krw and complex structural parameter is built for LOSZ as per the data of each of the specimens. After that, differential distributions of porosity are built for all specimens of LOSZ and TZ of the deposit, and namely separately for each of those zones. As per Kolmogorov-Smirnov criterion, there evaluated is similarity of integral porosity distributions of LOSZ and TZ of the deposit with probability value of 0.99. Considering the similarity of porosity of TZ and LOSZ of the deposit for the deposit as a whole, generalised distribution of porosity f(Kp) is built, which is determined as general totality reflecting in reliable manner the collecting properties of oil-saturated part of the deposit as a whole and at any of its levels above WS and above WOC.
EFFECT: providing reliable determination of oil saturation of transient zone of the deposit and maximum oil-saturated zone of the deposit.
3 tbl, 4 dwg
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