可控震源地震勘探的数值模拟

用可控震源激发的线性扫频（Chirp）信号模拟了二维地震勘探，采用相关处理技术把反射Chirp地震信号转化为脉冲地震信号形成了相关地震剖面，把相关地震剖面与脉冲震源产生的合成地震记录剖面进行了对比。相关地震剖面同相轴波形的最大绝对值出现的位置反映了界面的真实位置信息。相关地震剖面比脉冲震源产生的合成地震记录剖面具有更高的分辨率。对震源扫频信号进行适当地锥化处理可以部分地压制相关地震剖面中反射地震信号的旁瓣。

Numerical Simulation for Seismic Exploration with Vibrator

The authors perform the numerical simulation for 2D seismic exploration with a vibrator which produces a Chirp signal,translate the reflective Chirp seismic signals into pulse seismic signals with correlation processing technique so as to form a correlation seismogram section,and compare the correlation seismogram section with a synthetic seismogram section produced by a pulse source.In correlation seismogram section,the position corresponding maximum absolute value of event waveform indicates real position information of an interface.Correlation seismogram section possesses higher resolution than the synthetic seismogram section with the pulse source.Tapering the sweep signal can partially reduce the side lobes of reflective seismic signals in correlation seismogram section.