IDEA #88LYC5 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 moduluses 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 de- veloped. Innovative Aspects 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 moduluses 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 compa- nies) 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 substanti- ated 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, geo- physical and geological surveys of oil companies; seismology; engineering geophysics and geology; scientific investigations and education as well. 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. Fig.1. Experimental dependence of Poisson coefficient upon the pressure (Guliyev, G.G. The definition of Pois- son coefficient in strained media. Proceedings of Russian Academy of Sciences, 2000, vol. 370, №4, pp. 534-537). 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 influ- ences of many factors that are not taken into account in dependencies of phenomenological theory. The probabil- ity of appearance of such complications using the real seismic data is high enough. Contact details Institute of Geology of ANAS Contact person: Prof. Hatam H. Guliyev Head of Department of Tectonophysics Address: 29 A, H. Javid Avenue AZ1143, Azerbaijan, Baku Tel: (+994 12) 5105617 Fax: (+994 12) 497 5285 E-mail: hatam@lan.ab.az Dr. Aghayev Khanlar Boyukaga E-mail: esmira.agayeva@rambler.ru