摘要
随着油气勘探的发展,勘探的重点已逐渐转向岩性油气藏、隐蔽油气藏.理想弹性介质有时并不能解释许多复杂的实际问题.因此,本文是在粘弹性介质精确Zoeppritz方程的基础上,根据介质的分解理论,将均匀各向同性介质当作背景,将弹性参数的变化和粘弹性参数(品质因子和衰减角)均看成扰动,推导出了P波入射到粘弹性界面的反射透射系数近似公式,并利用四类AVO典型界面模型对反射系数近似公式进行分析与比较,一方面验证粘弹性近似式的正确性,另一方面进一步得到粘弹性介质地震波反射特征,为以后粘弹性近似式的应用提供了理论指导.
With the development of oil and gas exploration, the focus of seismic exploration has been transferred gradually to lithologic and subtle oil and gas reservoir. Ideal elastic media sometimes does not explain many complex practical problems. Therefor, this article based on precision Zoeppritz equation of viscoelastic medium, according to the decomposition theory of medium, the homogeneous isotropic medium as a background, and the elastic parameters transformation and viscoelastic parameters （quality factor and decay angle ） as disturbance, has derived the approximation formula of reflection and transmission coefficient of P waves to the viscoelastic interface. And using the four types of typical AVO interface model for analysis and comparison of the approximation formula of reflection coefficient, which firstly proves the correctness of the approximation formula of reflection coefficient, secondly further understands the seismic wave reflection characteristics in viscoelastic medium, thirdly provides a theoretical basis of the future application of the approximation formula.
出处
《地球物理学进展》
CSCD
北大核心
2013年第1期257-264,共8页
Progress in Geophysics
关键词
粘弹性介质
衰减角
品质因子
反射系数
透射系数
viscoelastic medium, decay angle, quality factor, reflection coefficient, transmission coefficient
