反褶积与信噪比的关系研究  

Study on the Relationship Between Deconvolution and Signal-to-Noise Ratio

作　　者：周洁玲[1] 成世琦[1] 

机构地区：[1]西南石油学院应用地球物理研究所,四川南充637001

出　　处：《西安石油学院学报（自然科学版）》2002年第4期24-27,共4页Journal of Xi'an Petroleum Institute（Natural Science Edition)

摘　　要：在地震资料数字处理中 ,分辨率与信噪比是一对相互制约的矛盾 ,为了在反褶积处理过程中控制信噪比 ,从理论上分析了反褶积后剖面信噪比降低的原因 .以不同相位子波为例 ,从时间域出发 ,利用最小平方反滤波原理计算出反褶积算子 ,并验证了反褶积后剖面信噪比的降低是受反子波能量的影响 .为了兼顾分辨率和信噪比 ,进而分析讨论了反褶积中的白噪化问题 ,提出可以用加入白噪的方法来控制信噪比 ,但白噪不易加入过大 ,否则 ,由于加入白噪后求出的反子波不再是原来子波的逆 。After seismic record is deconvoluted, its resolution is decreased. In order to control profile signal-to-noise ratio in the processing of deconvolution, the cause is analyzed in theory why the signal-to-noise ratio is decreased after deconvolution. Some different phase wavelets are taken as examples, their deconvolution operators were calculated based on the principle of minimal-square-deconvolution. It is proven that the signal-to-noise ratio is controlled by the energy of the inverse wavelet after deconvolution, and the greater the energy, the more the signal-to-noise ratio is decreased. It is put forward that the drop of the signal-to-noise ratio can be controlled by adding white noise. But the white noise is can't be added too much, otherwise the increase of the signal-to-noise ratio is limited because the inverse wavelet obtained after the white noise is added is not the inverse of the original wavelet.

关 键 词：反褶积 信噪比 地震资料处理 分辨率 滤波 白噪化 

分 类 号：P631.443[天文地球—地质矿产勘探]