Integrated acoustic and optical logging in adjacent rock mass. Equipment and physical modeling

One of the routes of advancing the downhole geophysical survey of the rock mass structure and behavior is the joint acoustic and optical research and the integrated processing of the results. For refining the acoustic measurement parameters, the article describes the shear wave scanning inspection of isotropic and laminated rocks, as well as samples with fracture. It is shown that the strongest attenuation of the shear wave amplitude takes place when the directions of particle displacement and stratification planes (fracture planes) coincide, and this fact can be used to determine fracture slopes during downhole ultrasonic scanning. With a view to testing the concept of ultrasonic and optical measurement integration, a dedicated logging system and a physical model of a well were manufactured. The core of the logging system is а sonic device capable of contactless optical identification of structural features of the well walls, as well as can record parameters of Pand S-waves with the adjustable polarization phasor in the ultrasonic frequency range. The model experimentation proved efficiency of the logging system. The method reliability increases with the qualitative coincidence of the acoustic and optical measurement results, and the performance enhances as the ultrasonic measurement is only carried out in abnormal zones detected by the optical inspection.

Nikolenko P. V., Zaitsev M. G. Integrated acoustic and optical logging in adjacent rock mass. Equipment and physical modeling. MIAB. Mining Inf. Anal. Bull. 2023;(1):95-106. [In Russ]. DOI: 10.25018/0236_1493_2023_1_0_95.

The study was supported by the Russian Science Foundation, Project No. 21-77-00046.

P.V. Nikolenko¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: p.nikolenko@misis.ru, ORCID ID: 0000-0002-5126-6576,
M.G. Zaitsev¹, Graduate Student, e-mail: michailzaytsev1997@gmail.com, ORCID ID: 0000-0001-9015-9346,
¹ National University of Science and Technology «MISiS», 119049, Moscow, Russia.

P.V. Nikolenko, e-mail: p.nikolenko@misis.ru.

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