METHOD FOR DETERMINING BOUNDARY CUTOFF TIMES T OF BITUMINOUS INTERVALS OF CARBONATE ROCKS OF RESERVOIRS Russian patent published in 2024 - IPC G01N24/08 G01N15/08 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry, in particular, to development of method for determination of boundary cutoff times of transverse relaxation T₂ of bituminous intervals of carbonate rocks of reservoirs of Eastern Siberia, based on integration of extraction-distillation method (EDM), pyrolytic method and method of nuclear magnetic resonance (NMR), and can be used to estimate the fraction of pores occupied by one or another fluid, when interpreting nuclear magnetic logging (NML). Essence of invention consists in determination of boundary cutoff times T₂, separating bitumens, heavy and light hydrocarbons, water from free pore space by an integrated method (extraction-distillation, pyrolytic method and NMR method) on core samples with preserved saturation, selected by isolated technology (WBM) or drilled at OBM/HBM. Obtained values of boundary cutoffs of times T₂ enable to estimate the fraction of pores occupied by one or another fluid, which can be used in the interpretation of nuclear magnetic logging (NML).

EFFECT: increasing the reliability of the assessment of the proportion of pore space occupied by bitumen and heavy hydrocarbons using the boundary cutoffs of times T₂ obtained by the proposed method.

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