| 偶然干扰对地震脉冲震相对比的影响 |
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| 引用本文： | 馬恩澤.偶然干扰对地震脉冲震相对比的影响[J].地球物理学报,1962,11(1):47-65. |
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| 作者姓名： | 馬恩澤 |
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| 作者单位： | 北京石油地质学校 |
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| 摘 要： | 在地震勘探中,有效地震波是在干扰背景上进行記录的,在記录上識別有效波一直是地震勘探的基本問題。本文中,我們假定地震脉冲是雷克对称形式的波漣,用随机过程分析法,討論了地震脉冲在平稳正态分布随机干扰影响下的幅度和相角分布函数及其它主要的統計特点,并指出地震脉冲波同相軸能够予以識别的条件,同相軸的可靠程度,能够予以識別的同相軸对应要求的最少地震脉冲波瞬时强度--門限值,并分析了用組合方法控制門限值的方法。
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| 关 键 词： | 地震脉冲 地震勘探 有效波 信杂比 地震波 干扰背景 同相轴 脉冲波 限值 有效脉冲 |
ON THE THEORY OF SIGNAL THRESHOLD IN SEISMIC PROSPECTING |
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| MA EN-TSE.ON THE THEORY OF SIGNAL THRESHOLD IN SEISMIC PROSPECTING[J].Chinese Journal of Geophysics,1962,11(1):47-65. |
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| Authors: | MA EN-TSE |
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| Institution: | College of Petroleum Geology, Peking |
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| Abstract: | The problem of primary importance in the study of reflection or refraction seismograms is to recognize effective impulse on the records. If a single seismometer were utilized to determine movement of the ground following a shot, it would generally be quite difficult to distinguish with surety the effective waves from spurious energies recorded on the seismogram. In seismic prospecting, the visual identification of effective waves is made possible by the method of simultaneously recording the motion of ground by using as many as 20 to 60 separate detecting seismometers on the same record. The alignment of the impulsive forms across the seismogram is usually referred to as "line-up" or "cophasal-axis" of seismic signal. By using the general probability distribution function of Rayleigh and assuming that seismic waves, are of the Ricker wavelet form, the problem of determining how far random noise statistically limits the detection of seismic cophasal axis in seismogram is studied. The idea that determination of signals of minimum detectable signal-threshold and the dependence of signal threshold on some kinds of parameters was discussed in detail. It may be of interest to mention that signal threshold may be controlled by such interference systems as multiple seismometers, pattern shooting, mixing circuits and magnetic head combination method in reproduction. |
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