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Experimental Analysis of Shearing Wave Anisotropic Propagation Characteristics in Fractured Formation

ZHAO Jun1,HOU Kejun1,CHEN Yijian1,WEN Xiaofeng2(1.School of Resources and Environment,Southwest Petroleum University,Chengdu,Sichuan 610500;2.Changqing Division,China Petroleum Logging CO.LTD.,Xi'an,Shaanxi 710200,China)  
The formation generally forms artificial fracture when fracturing it.But fissured formation usually has anisotropic characteristics.On the basis of split phenomenon which is caused by S-wave propagating in the fissured formation,tested are propagation characteristics of S-wave about fissured core using acoustic probe in the laboratory,and analyzed is the relationship about anisotropic characteristics of S-wave and fracture width and fracture direction.Through experimental analysis,the relationship about amplitude attenuation and propagation velocity of fast-slow S-wave with fracture width are obvious,and the influence of various occurrence fractures on anisotropic S-wave has obvious divergence.The experiment shows that the influence of horizontal fracture on anisotropic S-wave is obviously greater than on that of oblique crossing fracture.With the increase of fracture width,fast-slow S-wave amplitude,propagation velocity decrease;The amplitude difference between them increase with the fracture width increasing,so does the propagating time difference.So the anisotropic characteristics of S-wave may be effectively used to identify fracture directions to provide experimental guidance criterion for dipole shear wave logging data in the evaluation of fractured examination and postfracture responses.
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