摘要
地震波在粘弹性介质中传播时会发生衰减,地层的吸收必然会对岩石的弹性参数带来影响。由于地层的岩性变化和储层中含有的流体类型的变化,都会使地层对地震波产生不同的吸收作用,因此品质因子中蕴含着丰富的岩性及流体性质等信息。综合利用地层的吸收特征与地层弹性参数来进行储层预测,会更全面、更可靠地识别有效储层,减少多解性。这里从粘弹性介质的本构方程出发,推导了品质因子与波阻抗的近似关系式,讨论了地层吸收对AVO类型以及对弹性阻抗的影响,最后将地层品质因子融入到叠前弹性阻抗反演过程中,实现了地层品质因子与纵横波阻抗的同步反演,在实际应用中取得了明显效果。
Seismic wave will attenuate when propagating in viscoelastic medium.The rock absorption will certainly affect its elastic parameters.Since the attenuation of seismic wave is caused by lithological changes and fluid properties in the reservoir,the quality factor contains plenty of information about lithology or pore fluid.Integrated utilization of the absorption characteristics and elastic parameters for reservoir prediction will be more complete and more reliable to identify the effective reservoir and to reduce the ambiguity.In this paper,the approximate relation is derived between the acoustic impedance and the quality factor based on the viscoelastic constitutive equation.The effect caused by rock absorption on AVO types and elastic impedance are also discussed.And finally,by putting the quality factor into the pre-stack elastic impedance inversion procedure,the simultaneous inversion of quality factor and P-wave and S-wave impedance is realized.Its application effect in practical oil field is obvious.
出处
《物探化探计算技术》
CAS
CSCD
2010年第3期232-240,共9页
Computing Techniques For Geophysical and Geochemical Exploration
基金
国家高技术研究发展计划(863)(2006AA09A102)
国家自然基金(40739908)
关键词
品质因子
波阻抗
AVO
弹性阻抗
同步反演
quality factor
acoustic impedance
AVO
elastic impedance
simultaneous inversion
