浅谈可控震源在煤田地震勘探中应用的几点认识
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摘要
使用可控震源应注意三方面的问题:一是与大地的耦合,二是参数的最佳选取,三是在保证野外采集工作量近似不变情况下,提高地震剖面质量。解决方法是:配备可控震源力控装置、改变表层介质波阻抗可消除震源脱耦现象;选取参数应考虑清晰度、分辨率、信噪比,避免虚像出现在有效记录范围内;在野外数据采集时应减少振动次数、增加覆盖次数并注意压制不规则干扰和噪声,以提高地震剖面质量。
Three problems need to pay attention to when the vibrator is used: the first is feeding through with earth;the second is optimal selection of parameters;the third is to raise seismic profile quality while keep the field data gathering load almost fixed.The ways out are: equipped force control device with vibrator,to change natural impedance of near-surface media may eliminate the coupling shifting of the source;definition,resolution and signal-noise ratio should be considered during the selection of parameters,to avoid virtual image present into effective recording range;vibration frequency need to be reduced,coverage increased and irregular noise suppressed in order to improve seismic profile quality.
Three problems need to pay attention to when the vibrator is used: the first is feeding through with earth;the second is optimal selection of parameters;the third is to raise seismic profile quality while keep the field data gathering load almost fixed.The ways out are: equipped force control device with vibrator,to change natural impedance of near-surface media may eliminate the coupling shifting of the source;definition,resolution and signal-noise ratio should be considered during the selection of parameters,to avoid virtual image present into effective recording range;vibration frequency need to be reduced,coverage increased and irregular noise suppressed in order to improve seismic profile quality.
引文
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