频谱整形技术的计算机模拟研究

Computer Analogue Study on Spectrum Shaping Technology

地层的高频吸收衰减效应是导致地震勘探分辨率不高的主要原因 ,在高分辨率野外地震数据采集系统中 ,频谱整形滤波器 (SSF)是所设置的重要部件。文章讨论了地层吸收衰减与地震波的传播距离、频率、时间和介质波速的关系 ;用计算机模拟的方法研究地层吸收衰减使分辨率降低的程度和 SSF对高频信号的补偿效果 ,指出了 SSF对分辨率的补偿量只占由于地层吸收衰减而导致分辨率降低量的 42 .5

The effect of earths absorption wane to the high frequency signal is the chief reason for causing the resolution of the seismic prospecting not being high.In the field seismic data system of high resolution,the spectrum shaping filter (SSF)is a important part which we set.In this paper,the relations between the earths absorption wane and the communication distance of seismic wave, frequence, time and medium velocity are discussed. The level of resolution reducing due to earths absorption wane and the SSF compensation effect to the high frequency signal are studied by using the computer analogue technique. It is pointed out that the SSF resolution compensation is only about 42.5% in the resolution reducing caused by earths absorption wane.