Recent Study and Modeling of Nonlinear Acoustic Processes in a Layered Nonlinear Medium with a Porous Fluid-Saturated Inclusion of a Hierarchical Type


Problem statement: This paper presents the findings of a research of seism acoustic emission in a porous two-phase geological environment under acoustic impact. The study of acoustic emission in oil field reservoirs is based on well observations. Acoustic emission is characterised by a reflection of stress relaxation and heightened susceptibility to environmental forces. The regularity of acoustic emission processes, which presents itself as discrete spectra of signals resembling oscillations of nonlinearly coupled oscillators, is demonstrated. Each form of rock has its own set of spectral features.

The process of resonant acoustic response of a porous fluid-saturated reservoir of a hierarchical structure to an acoustic frequency stimulation located in an elastic N-layer medium with plastic properties is written using an algorithm. For the solution of integral and integral-differential equations, that algorithm is built as an iterative process. The spectra of observed data of acoustic emission in oil wells is used to determine the frequencies that are parameters of the direct problem.

Typical Results: The relationship between resonant frequencies of acoustic emission was discovered for the first time, and these values were used in the algorithm of modelling acoustic processes in a fluid saturated nonlinear plastic environment. Finally, the investigation of these emission processes can be used to learn more about the filtration-capacitive qualities of producing reservoirs with a hierarchical structure. It is based on real-world data from Western Siberian oil fields.

Author (s) Details

Olga Hachay
Institute of Geophysics, Ural Branch of Russian Academy of Sciences, Yekaterinburg, Russian Federation.

Veniamin Dryagin
LLC“NPF Intensonik” Yekaterinburg, Russia.

Andrey Khachay
Ural Federal University, Yekaterinburg, Russian Federation.

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