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Home Azerbaijan Technologies Method of Definition of the Linear Physical-Mechanical Properties of the Geological Media in Their Natural State

Method of Definition of the Linear Physical-Mechanical Properties of the Geological Media in Their Natural State

Description

The technology of definition of true values of the fundamental elastic modules of the linear elasticity (Lamé coefficients λ and μ, or, that is the same, the Poisson coefficient ν and Е module) of the rocks and geological media in their natural states has been developed.

Innovative Aspect and Main Advantages

For the first time the method has been developed that allows more precisely and truly determine the true values of fundamental elastic modules of the linear elasticity of the rocks and geological media in their natural states, i.e. taking unto account their modern geodynamic evolution. This method operates on the base of field and well seismic data. The existing and widely used (mainly in oil companies) modern methods (analogues) are based on the linear theory of elasticity and elastic waves and allow determine only the effective (“apparent”) values of the required parameters.

The proposed method is based on a more substantiated and precise non-classically-linearized theory (NLT) of the deformed hard materials and elastic waves and allows defining the true values of those parameters on the base of information on velocity of longitudinal and transverse seismic waves, non-linear elastic deformations and pressures.

Areas of Application

The method can be used in seismic surveys, geophysical and geological surveys of oil companies; seismology; engineering geophysics and geology; scientific investigations and education as well.


Fig. 1 Experimental dependence of Poisson coefficient upon the pressure
(Guliyev, G.G. The definition of Poisson coefficient in strained media.
Proceedings of Russian Academy of Sciences, 2000, vol. 370, №4, pp. 534-537).

Stage of Development

Algorithm of method and appropriate computer pack-age program has been prepared. The interface of the computer program for usage is being worked out at present. European patent for method is in process.

The fundamental properties of material, including the Poisson coefficient, should be invariant relatively to the level and type of acting external loads and for all natural and artificial materials 0 ≤ ν ≤ 0,5. The results on figure show that during the experiment the requirements of linear theory of elasticity on small deformation and the Hooke law have been distorted. These results reflect the influences of many factors that are not taken into account in dependencies of phenomenological theory. The probability of appearance of such complications using the real seismic data is high enough.

Contact Details

Institute of Geology
Contact person: Prof. Hatam H. Guliyev
Address: 29 A, H. Javid Avenue, AZ1143, Azerbaijan, Baku
Tel: (+994 12) 510 5617
Fax: (+994 12) 497 5285
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Dr. Aghayev Khanlar Boyukaga
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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