FIELD: oil and gas industry.
SUBSTANCE: method includes taking core, making correct shape samples, stepped loading of samples with delay for pressure stabilization at each load and determining of volume of pores before and after each load. Samples are loaded cyclically. Each cycles comprises serially loading with pressure, by means of compression, in parallel and in perpendicular to bed, pressure stabilization, by determining by weighting method of pores volume, including difference of masses of water-saturated and dry sample before and after compression. Cycles are repeated until reaching resilience limit, moment of which is fixed on basis of steep increase of Poisson coefficient, calculated from mathematical formula: 
where ν - Poisson coefficient; ΔM, ΔM1 - differences of masses of water-saturated and dry sample before and after compression, kg; d - sample diameter, m; l - sample length, m.
EFFECT: higher precision.
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