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Russian Geology and Geophysics

2006 year, number 2

SEISMIC VELOCITIES AND ATTENUATION IN PRESSURIZED CONSOLIDATED ROCKS

B.V. Pashkov and E.I. Mashinskii
Institute of Geophysics, Siberian Branch of the RAS,
3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Nonlinearity, hysteresis, P and S velocities, attenuation
Pages: 308-315

Abstract

Stress dependence of seismic velocities and attenuation has been studied using the available reported data and original laboratory experiments on quartz single crystals and sandstone samples. The experiments show velocity decrease and attenuation increase with stress in quartz crystals.P and S velocities in sandstone decrease also with changing pore pressure at invariable hydrostatic pressure. The velocity and attenuation functions show open hysteresis loops in a full loading-unloading cycle.