摘要
利用地震波衰减特征进行地下储层流体性质预测已成为近年来研究的热点之一.地震波在含气地层传播过程中具有波动能量衰减剧烈、波形变化大、横向连续性差等特点,反映在地震波频谱中为高频分量衰减迅速、主频向低频方向移动、频带宽度变窄等现象.本文采用波动方程数值模拟方法,研究了含气地层地震波频谱的变化特征,认为含气层地震波频谱高频端衰减变化率与频率关系是含气层最为敏感的地震衰减参数,由此提出了利用不同频率分量进行含气层地震识别的有效方法.
The prediction of reservoirs fluid properties using seismic attenuation has become a research hotspot in recent years. Seismic wave energy is strongly attenuated, waveform is distorted as seismic wave propagate through the gas-bearing reservoirs. Correspondingly, high frequency components are rapidly attenuated, main frequency moves toward lower frequency direction in the seismic wave spectrum. The characteristic of the spectrum of gas-bearing reservoirs simulated by full wave equation has been studied, it is concluded that the relationship between the rate of change in attenuation of the spectrum and frequency is the most sensitive indicators of the seismic identification of the gas-beating reservoirs. Thus, an effective method of seismic identification of gas-bearing reservoirs is proposed.
出处
《湖南理工学院学报（自然科学版）》
CAS
2012年第3期48-52,58,共6页
Journal of Hunan Institute of Science and Technology(Natural Sciences)
关键词
地震波衰减
天然气
频率
频谱
波动方程
seismic attenuation
gas
frequency
spectrum
wave equation
