Study on the Influence of Fracture Distortion Degree on the Dispersion and Attenuation of Elastic Wave
[Purposes]The effect of fracture distortion on the dispersion and attenuation of elastic waves is studied,and the intrinsic relationship between the fracture geometry and the propagation characteristics of elastic waves is revealed.[Methods]In this paper,the influence of fracture distortion on jet stream ef-fect was analyzed.The generalized Maxwell constitutive equation is used to approximate the Newtonian fluid constitutive equation,and the dynamic stress-strain simulation is used to calculate the elastic wave dispersion and attenuation in the vertical fracture direction.The numerical simulation reveals the elastic wave dispersion and attenuation behavior under different distortion degrees,and the influence of fracture geometry on the dispersion characteristics is summarized.[Findings]With the increase of distortion de-gree,the characteristic frequency and peak value of attenuation decrease.Velocity and distortion are positively correlated in the low frequency region and negatively correlated in the high frequency region.[Conclusions]The distortion degree of fracture has great influence on the jet stream effect of elastic wave,which should be paid attention to in the interpretation of actual data.
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