Frequency-dependent reflections in elastic diffusive-viscous media
发布时间：2025-04-30
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- 发布时间：
- 2025-04-30
- 论文名称：
- Frequency-dependent reflections in elastic diffusive-viscous media
- 发表刊物：
- Journal of Geophysics and Engineering
- 摘要：
- Amplitude variation with offset/angle of incidence (AVO/AVA) analysis is essential for
hydrocarbon detection and reservoir characterization. Frequency-dependent AVO analysis plays
an important role in seismic interpretation especially for the low-frequency seismic anomalies
related to hydrocarbon reservoir. The diffusive-viscous model is used to explain these anomalies,
but it does not consider the shear effects of rocks. In this work, we firstly extend the diffusiveviscous
model to elastic case based on the mechanisms in a macroscopic porous medium. The
elastic diffusive-viscous model describes attenuation of compressional and shear waves in a
fluid-saturated medium and it reduces to the classic elastic wave equation in a special case. Then,
we investigate the properties of reflection/transmission coefficients at an interface between two
different elastic diffusive-viscous media. The reflection/transmission coefficients not only relate
to the parameters of the media but also depend on the frequency. Two examples are given to
analyze the dependence of the reflection/transmission coefficients on the frequency and incident
angle at interfaces between gas-saturated sandstone and brine-saturated shale and between brinesaturated
shale and oil-saturated sandstone. The results show that the magnitudes and phase
angles of the reflection/transmission coefficients are significantly dependent on the frequency at
lower frequency (<20 Hz). Finally, we apply the frequency-dependent reflection/transmission
coefficients to the extended reflectivity method to model the propagation of the elastic diffusiveviscous
wave in a layered medium. The modeling results show that the diffusive-viscous wave
has strong amplitude attenuation and phase shift compared with those of elastic wave when the
wave propagates across fluid-saturated layers.
- 合写作者：
- Haixia Zhao*, Jinghuai Gao and Jigen Peng
- 卷号：
- 15(5)
- 页面范围：
- 1900-1916
- 是否译文：
- 否
- 发表时间：
- 2018-10-01