METHOD RESEARCH core samples

摘要

FIELD: physics.;SUBSTANCE: extracted core sample is saturated with a model hydrocarbon system under a vacuum; the initial amount of hydrocarbons in the core sample is determined using a weight method (M); pulsed nuclear magnetic resonance is used to measure decay of the magnetisation signal of liquid hydrocarbons (Ao) in the pore space of the core sample; the amplitude of decay of magnetisation of liquid hydrocarbons in the pore space is used to determine the initial amount of hydrocarbons in the sample; that value is associated with the initial amount of hydrocarbons determined by weighing; the hydrocarbon-saturated sample is cooled to temperature of 3-5°C; decay of the magnetisation signal of the liquid phase is recorded; the decay amplitude (A₁) and the known values Ao and M are used to determine the amount of hydrocarbons in the boundary layer Mgs; the shape of the decay is used to determine the transverse relaxation time of molecules of the boundary layer which characterises mobility of the boundary layer; thickness of the boundary layer is calculated from the value Mgs, as well as density of the hydrocarbon system, specific surface area of the pore space of the core sample, weight of the dry core sample; several new parameters are determined by further heating of the core sample to room temperature and cooling it to temperature of 3-5°C, while performing additional operations.;EFFECT: enabling rapid and highly reliable obtaining of full information on a rock in a single analysis cycle on one core sample, while also determining parameters of the boundary layer of hydrocarbons in the pore space of core samples.;1 tbl, 3 dwg