Study of porosity of sedimentary rock samples by nuclear magnetic resonance and laser-ultrasound diagnostics

The paper describes a study of sedimentary rock samples from an oil and gas field of the Timan-Pechora Basin Province. Petrographic analysis of the samples was conducted by using a scanning electron microscope operating in an optical image mode, the geometry of surface pores characterized. The mineral composition was represented by secondary dolomite and secondary calcareous dolomite. Pores 1.5 to 35 µm in size and caverns 43 to 1750 µm long were observed on the surface of the samples. The open porosity of the samples was estimated by using the hydrostatic weighing method, ranging from 9.5 to 13.40%. The total porosity was determined by using nuclear magnetic resonance (NMR) and laser-ultrasound diagnostics. A GeoSpec+ 2/75 analyzer was used to measure the transverse relaxation time so as to estimate the total porosity. The longitudinal wave velocity in a non-porous material with the same mineral composition was calculated and then the total porosity was estimated. It is found that the total porosity determined by both methods is on average 1% higher than the open porosity. The difference in the total porosity measured by the two methods is no more than 0.2–0.4%.

Keywords: porosity, dolomite, petrophysical properties, nuclear magnetic resonance, transverse relaxation time, laser-ultrasound diagnostics, wave velocity, scanning electron microscopy.
For citation:

Cherepetskaya E. B., Zalevskii Ia. O. Study of porosity of sedimentary rock samples by nuclear magnetic resonance and laserultrasound diagnostics. MIAB. Mining Inf. Anal. Bull. 2023;(8):63-71. [In Russ]. DOI: 10.25018/0236_1493_2023_8_0_63.

Issue number: 8
Year: 2023
Page number: 63-71
ISBN: 0236-1493
UDK: 550.84.02
DOI: 10.25018/0236_1493_2023_8_0_63
Article receipt date: 17.05.2023
Date of review receipt: 09.06.2023
Date of the editorial board′s decision on the article′s publishing: 10.07.2023
About authors:

E.B. Cherepetskaya1, Dr. Sci. (Eng.), Professor, e-mail:,
Ia.O. Zalevskii1, Student, e-mail:,
1 Mining Institute, National University of Science and Technology «MISiS», 119049, Moscow, Russia.


For contacts:

Ia.O. Zalevskii, e-mail:


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