AN ELASTIC CONSTITUTIVE MODEL FOR FREQUENCY-DEPENDENT ANISOTROPY IN THE MEDIUM WITH MULTI-SCALE FRACTURES

摘要：

An elastic constitutive model was proposed according to the combination of high-frequency Hudson model and low-frequency Gassmann model.The effects of fluid flow between the pores and the fractures with multiscale distribution have been considered.The combined model was validated with synthetic seismograms.The results reveal that the anisotropic dispersion can occur at seismic frequency.P-wave velocity dispersion and attenuation are significant over a frequency range which spans at least two orders of magnitude.Acceptable results are obtained within the low-frequency and high-frequency limits,using the model we have presented.The properties agree well with anisotropic Gassmann model at low frequency,while the velocity is hardly affected by the fractures and the behavior of fractures corresponds to the results for isolated cracks filled with a fluid at high-frequency limit.

关键词： frequency-dependent anisotropy constitutive model multi-scale fractures

作者: K.F.Han

作者单位: Institute of Optoelectronic Science and Engineering,National University of defense Technology,Changsha,Hunan 410073,P.R.China

会议类型: 国际会议

会议名称: The Third International Conference on Heterogeneous Material Mechanics(第三届国际非均匀材料力学会议)

会议地点: 上海

会议语种:英文

页码: 401-404

在线出版日期: 2011-05-22（万方平台首次上网日期，不代表论文的发表时间）