| 流体分布对松散介质中P波速度和衰减的影响 |
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| 引用本文： | 李光泉,李伟东,施行觉,温丹.流体分布对松散介质中P波速度和衰减的影响[J].西北地震学报,2000,22(4):361-367. |
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| 作者姓名： | 李光泉 李伟东 施行觉 温丹 |
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| 作者单位： | 中国科学技术大学地球与空间科学系,安徽,合肥,230026 |
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| 基金项目： | 中国科学院资助项目，地震科学联合基金 |
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| 摘 要： | 为了深入研究流体对岩石中弹性波速度和衰减的影响，必须考虑到流体的分布和粘性。引入气体包裹体模型来研究粘性流体的分布对松散介质中P波速度和衰减的影响，用气泡平均半径来描述流体分布的不均匀性，计算了不同气泡半径和频率下P波速度和衰减随饱和度变化的曲线，并与有效流体模型作了比较，由于流体喷流的存在会使Gassmann方程在高频下不适用，用干燥和饱和流体的P波、S波速度修正了理论曲线。测量了玻璃微珠中不同水饱和度下高频P波的速度和衰减，并尝试用峰值频率来计算衰减。此方法求出的Q和频谱比法求出的Q在干燥或饱和水时基本相同，随饱和度的变化规律也基本一致，但衰减峰的大小有差异。根据实测值得似事经修正的波速和衰减理论曲线从而估算出气泡平均半径，认为P波速度和衰减不仅与饱和度有关而且也与介质内部气体－液体压力平衡有关。
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| 关 键 词： | P波 衰减 流体分布 松散介质 气体包裹体模型 |
| 收稿时间： | 1999/8/11 0:00:00 |
THE DEPENDENCE OF VELOCITY AND ATTENUATION IN UNCONSOLIDATED SANDS ON FLUID DISTRIBUTION |
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| LI Guang-quan,LI Wei-dong,SHI Xing-jue and WEN Dan.THE DEPENDENCE OF VELOCITY AND ATTENUATION IN UNCONSOLIDATED SANDS ON FLUID DISTRIBUTION[J].Northwestern Seismological Journal,2000,22(4):361-367. |
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| Authors: | LI Guang-quan LI Wei-dong SHI Xing-jue and WEN Dan |
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| Institution: | Department of Earth and Space Sciences, US TC, Hefei 230026, China,Department of Earth and Space Sciences, US TC, Hefei 230026, China,Department of Earth and Space Sciences, US TC, Hefei 230026, China and Department of Earth and Space Sciences, US TC, Hefei 230026, China |
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| Abstract: | In order to study deeply the dependence of the velocity and attenuation of elastic waves in rocks on fluids,the distribution and viscosity of fluids must be considered.The authors introduced a gas pocket model to investigate the dependence of the velocity and attenuation of P waves on viscous fluid distribution,described the uniformity of fluid distribution with average bubble radius,calculated the curves which related velocities and attenuation with saturation under different bubble radius and pressure frequency and compared gas pocket model with effect fluid model.Because Gassmann equation weren''t applicable under high-frequency pressure due to the local flow,the theoretical curves were corrected with the P wave and S wave velocities in dry and saturated sands.The saturation dependence of the P wave velocity and attenuation is measured and the attenuation was attempted to derive by using amplitudes of the peak frequency.The attenuation at dryness and saturation and the attenuation law from dryness to saturation are the same as those by spectral ratio method,but amplitude of the peak attenuation is different.By regressing measured velocity and attenuation with theoretical curves and computing the average radius of bubbles.It is considered that the saturation dependence of velocities and attenuation is related with pressure equilibration between gas and liquid in sands. |
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| Keywords: | P wave Wave velocity Attenuation Fluid distribution Loose medium |
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