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《Progress in Geophysics》 2008-02
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The experimental observation of the rock orthorhombic anisotropy

WEI Jian-xin1,DI Bang-rang1,WANG Chun-yong2(1.CNPC Key Laboratory of Geophysical Exploration at China University of Petroleum,Beijing 102249,China;2.Institute of geophysics,China Seismology Bureau,Beijing 100081,China)  
Diverse factors can contribute to anisotropy of rock velocity.Furthermore,orthotropy occurs with the perpendicular distribution of such factors.Through S-wave polarization scanning mode of ultrasonic impulse testing,rock samples with three different properties are measured to evaluate the variation of S-wave velocity in three perpendicular coordinates.By analyzing S-wave splitting of three directions and polarization of the maximum or minimum speed S-wave amplitudes,we think that the velocity orthotropy and fracture orientation observed in the grain sandstones and crack marble samples can be estimated in terms of the polarization and velocity of S-wave.Also,perpendicularity characteristics on the two types of rocks can attribute to the bedding and structure of rocks(directional grains or crystallize).Lab scale ultrasonic testing can obtain the structural direction of orthotropy.
【Fund】: CNPC物探重点实验室基金(GPKL0208)资助
【CateGory Index】: P631.4
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