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Izvestiya, Physics of the Solid Earth

, Volume 43, Issue 8, pp 683–690 | Cite as

Amplitude-dependent effects of longitudinal seismic wave propagation in the interhole space

  • E. I. Mashinskii
Article

Abstract

Field investigations of the amplitude dependence of the P wave velocity in dry and water-saturated rocks are carried out in the space between two shallow boreholes. The seismic wave velocity nonlinearly varies with the strain amplitude in the range ∼(4–50) × 10−8. The pattern of the velocity variation with amplitude depends on the pulse propagation direction. In dry and partially water-saturated rocks, the wave velocity decreases by 1.5% with the amplitude increasing within the range mentioned above and increases by 0.4% in completely water-saturated rocks (with an accuracy of up to 0.1%). Amplitude variations within a closed cycle (A min … → A max … → A min) lead to hysteresis in the V p (A min-max-min) dependence (i.e., the ascending and descending branches of the curve do not coincide). If the hysteretic loop is not closed, the residual velocity component ΔV p (A) is present. This effect is observed in dry and weakly saturated rocks. In a completely saturated rock, hysteresis of the velocity dependence is absent; the ascending and descending amplitude branches coincide. It is suggested that the amplitude characteristics and their hysteresis can be used in the future as an additional criterion for the differentiation of rocks by their fluid saturation.

PACS numbers

91.30.Ab 

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Copyright information

© Pleiades Publishing, Ltd. 2007

Authors and Affiliations

  1. 1.Institute of Petroleum Geology and Geophysics, Siberian DivisionRussian Academy of SciencesNovosibirskRussia

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