| 双相介质中地震波衰减的物理机制 |
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| 引用本文： | 李子顺.双相介质中地震波衰减的物理机制[J].应用地球物理,2008,5(1):9-17. |
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| 作者姓名： | 李子顺 |
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| 作者单位： | Exploration ＆ Development Research Institute of Daqing Oil Field Company, Ltd., Daqing 163712, China. |
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| 摘 要： | High-frequency seismic attenuation is conventionally attributed to anelastic absorption. In this paper, I present three studies on high-frequency seismic attenuation and propose that the physical mechanism results from the interference of elastic microscopic multiple scattering waves. First, I propose a new theory on wave propagation in a two-phase medium which is based on the concept that the basic unit for wave propagation is a nano- mass point. As a result of the elasticity variations of pore fluid and rock framework, micro multiple scattering waves would emerge at the wavelength of the seismic waves passing through the two-phase medium and their interference and overlap would generate high- frequency seismic attenuation. Second, I present a study of the frequency response of seismic transmitted waves by modeling thin-layers with thicknesses no larger than pore diameters. Results indicate that high-frequency seismic waves attenuate slightly in a near-surface water zone but decay significantly in a near-surface gas zone. Third, I analyze the seismic attenuation characteristics in near-surface water and gas zones using dual-well shots in the Songliao Basin, and demonstrate that the high-frequency seismic waves attenuate slightly in water zones but in gas zones the 160-1600 Hz propagating waves decay significantly. The seismic attenuation characteristics from field observations coincide with the modeling results. Conclusions drawn from these studies theoretically support seismic attenuation recovery.
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| 关 键 词： | 介质 地震衰减 波传播 散射波 |
| 修稿时间： | 2007年10月31 |
Physical mechanism of seismic attenuation in a two-phase medium |
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| Zishun Li.Physical mechanism of seismic attenuation in a two-phase medium[J].Applied Geophysics,2008,5(1):9-17. |
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| Authors: | Zishun Li |
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| Institution: | (1) Exploration & Development Research Institute of Daqing Oil Field Company, Ltd., Daqing, 163712, China |
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| Abstract: | High-frequency seismic attenuation is conventionally attributed to anelastic absorption. In this paper, I present three studies on high-frequency seismic attenuation and propose that the physical mechanism results from the interference of elastic microscopic multiple scattering waves. First, I propose a new theory on wave propagation in a two-phase medium which is based on the concept that the basic unit for wave propagation is a nano-mass point. As a result of the elasticity variations of pore fluid and rock framework, micro multiple scattering waves would emerge at the wavelength of the seismic waves passing through the two-phase medium and their interference and overlap would generate high-frequency seismic attenuation. Second, I present a study of the frequency response of seismic transmitted waves by modeling thin-layers with thicknesses no larger than pore diameters. Results indicate that high-frequency seismic waves attenuate slightly in a near-surface water zone but decay significantly in a near-surface gas zone. Third, I analyze the seismic attenuation characteristics in near-surface water and gas zones using dual-well shots in the Songliao Basin, and demonstrate that the high-frequency seismic waves attenuate slightly in water zones but in gas zones the 160-1600 Hz propagating waves decay significantly. The seismic attenuation characteristics from field observations coincide with the modeling results. Conclusions drawn from these studies theoretically support seismic attenuation recovery. |
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| Keywords: | two-phase medium seismic attenuation nanometer wave propagation theory multiple scattering waves |
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