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选取有代表性的岩石样本 ,实验室模拟地下岩层的实际物理状态 ,对P波的品质因数Q和波速进行了测试 ,结果表明 ,松辽盆地地下岩层的P波Q和波速皆随压力的增加呈线性增加 ,随温度的增加呈线性减小 ;且Q与波速符合幂律关系 .粘弹介质地震波场正演模拟表明 ,导致地震波衰减的主要是第四系低速带的影响 .通过地震测井资料估算 ,按目前的地震采集方式 ,即潜水面 (低速带 )以下激发 ,检波器地面接收 ,从激发到接收 ,地震波在第四系中高频成分将损失 170Hz .在最理想情况下 ,爆炸震源激发的初始子波频宽为 4 0 2Hz ,经过第四系和下伏地层吸收 ,第四系以下的反射波频带宽度不会超过 2 32Hz ,这是松辽盆地受地层吸收限制的高频采集极限
The representative rock samples are selected and the laboratory simulates the actual physical state of underground rock strata. The quality factor Q and wave velocity of P wave are tested. The results show that the P wave Q and wave velocity of the underground rock strata in Songliao Basin are both increased with the increase of pressure Linearly increase with increasing temperature, and decrease linearly with the increase of temperature.Q and wave velocity accord with power law.The forward modeling of seismic wave field in viscoelastic media shows that the attenuation of seismic wave is mainly caused by the Quaternary low velocity zone.According to seismic logging According to the estimation of the data, according to the current seismic acquisition mode, that is, the excitation below the surface of the submersible (low speed belt) and the reception of the geophone, from excitation to reception, the seismic wave will lose 170Hz of high frequency components in Quaternary system. In the best case, Excitation of the initial wavelet bandwidth of 4 0 2Hz, after the Quaternary and the underlying strata absorption, the Quaternary below the reflected wave frequency bandwidth does not exceed 2 32Hz, which is limited by the strata absorption Songliao Basin high-frequency acquisition limit