地震勘探仪器中频谱整形滤波器的理论研究

Study on Theory of Spectral Shaping Filter in the Seismic Prospecting Instrument

导致地震勘探分辨率降低的首要因素是地层对高频信号的吸收作用；其次是仪器的瞬时动态范围小和等效噪声大。该文从理论上论述频谱整形滤波器（SSF）在高分辨率地震勘探中的作用，阐述SSF可以弥补地层对高频信号的吸收，降低仪器相对于高频信号的等效输入噪声，扩大仪器的瞬时动态范围和系统动态范围。同时，对SYSTEM－ONE（TWO）仪器的SSF进行深入的理论分析，指出了高频提升量、高频提升速度和频率提升范围是影响SSF工作性能的三个重要因素。

The chief factor that cause the seismic exploration resolution reducing is the earth's absorption to thehigh frequency signal while the narrow instantaneous dynamic range of the instrument and the high equivalent input noises also have the contribution. This paper theoretically discussed the function of spectralshaping filter (SSF ) in high resolution exploration application. The SSF can compensate the losses by ab-sorption,lower instrument's equivalent input noise level, widen the.instantaneous dynamic range and sys-tem dynamic range. Based on the analysis of SSF on System- I (System-II ), it is indicated that the highfrequency lifting, the lifting ratio and the range of frequency to be lifted both are important factors affecting the proper function of SSF.