METHOD AND DEVICE FOR MEASURING POROSITY OF ROCKS Russian patent published in 2007 - IPC G01N24/08 

FIELD: measuring technique.

SUBSTANCE: amplitude characteristic A₀ of free induction signal (FIS) is measured from standard volume V₀ of liquid in measuring container (MC). Necessary amount of prepared sample of rocks is placed into fluoride organic oil (FOO) till reaching standard level and excess liquid is removed. Amplitude A₁ if FIS is measured from volume V₁ of FOO, which volume is kept among particles of specimen, and volume V_rest is evaluated on base of ratio of V_rest=A₀-A₁/A₀=1-V₁/V₀. Nuclear magnetic resonance equipment is adjusted for resonance conditions of nuclei of H-containing liquid, which liquid fills in porous space of rocks to be estimated. Area characteristic of FIS is measured on base of threshold volume V_thr of H-containing liquid in it. Measured value of the characteristic is used to estimate the volume by means of volumetric-area palette. Rocks specimen open porosity coefficient is determined on base of comparison of estimated values of threshold volume and volume of the sample in automatic mode using relation of K_p=V_p/V_rest.

EFFECT: reduced power of radiation dosage; reduced sizes.

15 cl, 1 tbl, 2 dwg