Yun Wang et al 2009 J. Geophys. Eng. 6 386 doi:10.1088/1742-2132/6/4/006
Yun Wang, Jun Lu, Ying Shi and Chun Yang
Show affiliationsThrough assumption of the equivalent velocity and equivalent quality factor of the PS-wave, in visco-elastic media, PS-wave Q estimation can be realized with the P-wave quality factor and P- to S-wave velocity ratio. For sedimentary rock, which has strong agglutination, the internal friction is mainly contributed by the shear friction along crevices or inter-granular crevices, so that a relationship between PS-wave Q values and P-wave Q values can be built up even when the S-wave Q values are unknown. In the estimation of the PS-wave quality factor, the P- to S-wave velocity ratio can be computed based on two-way traveltimes of PP and PS events respectively, in order to avoid the influence of the inaccuracy of P- and S-wave velocities. The method is demonstrated with a zero-offset VSP data in a coal-mining field. The results of P-wave and PS-wave Q values estimated show a consistency with lithology revealed from drilling.
91.30.Cd Body wave propagation
Issue 4 (December 2009)
Received 15 July 2009, accepted for publication 8 September 2009
Published 29 September 2009
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