地震分辨力与信噪比无关
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摘要
基于众多研究者对笔者(2005)论文"地震分辨力新认识"中提出的地震分辨力与信噪比无关这一结论的质疑,从分析分辨力和信噪比两个基本概念出发,探讨了地震分辨力的内在本质,找出了问题的根源,进一步明确了地震分辨力与信噪比无关的结论,并为去噪和提高分辨力指明了研究方向。研究认为,地震分辨力取决于地震子波特性(包括子波主频、带宽、相位等),地震子波一定,地震分辨力惟一确定;可分辨准则的确立为地震分辨力的定量描述提供了一个客观评价标准;提高地震分辨力应当从提高或改善地震子波特性入手;噪声的存在不会影响地震分辨力的大小,但却会影响地震分辨力的实用性;分辨力与信噪比无关,视觉分辨率与信噪比有关;寻求最佳的波场分离方法是去噪处理的根本出路。获得理想的无噪声记录是最大限度提高分辨力的必由之路。
Because many researchers questioned about the conclusion that the seismic resolution is irrelative to S/N ratio presented by the author in the paper "New knowledge of seismic resolution" published in 2005, starting from two basic conceptions-resolution and S/N ratio, the paper discussed the inherence of seismic resolution, found out the root of the problem, further clarified the conclusion that the seismic resolution is not relative to S/N ratio and pointed out the direction of denoise and improving resolution. The study showed that the seismic resolution depends on the characteristics of seismic wavelet, including dominant frequency, bandwidth and phase of wavelet, the seismic resolution is uniquely determined if seismic wavelet is fix; determination of resolvable guidelines provides an objective judgment standard for quantitative description of seismic resolution; improving seismic resolution should start from improve the characteristics of seismic wavelet; the existence of noise may not affect the seismic resolution; looking for optimum wavefield separation approach is fundamental way of denoise processing. Acquiring ideal noise-free record is the only way to maximum improving the resolution.
Because many researchers questioned about the conclusion that the seismic resolution is irrelative to S/N ratio presented by the author in the paper "New knowledge of seismic resolution" published in 2005, starting from two basic conceptions-resolution and S/N ratio, the paper discussed the inherence of seismic resolution, found out the root of the problem, further clarified the conclusion that the seismic resolution is not relative to S/N ratio and pointed out the direction of denoise and improving resolution. The study showed that the seismic resolution depends on the characteristics of seismic wavelet, including dominant frequency, bandwidth and phase of wavelet, the seismic resolution is uniquely determined if seismic wavelet is fix; determination of resolvable guidelines provides an objective judgment standard for quantitative description of seismic resolution; improving seismic resolution should start from improve the characteristics of seismic wavelet; the existence of noise may not affect the seismic resolution; looking for optimum wavefield separation approach is fundamental way of denoise processing. Acquiring ideal noise-free record is the only way to maximum improving the resolution.
引文
[1]云美厚,丁伟.地震分辨力新认识.石油地球物理勘探,2005,40(5):603~608
[2]http://www.agoil.cn/bbs/read.php?tid=178608
[3]李庆忠.地震勘探分辨率与信噪比谱的关系——答云美厚“地震分辨力新认识”一文.石油地球物理勘探,2008,43(2):244~245
[4]云美厚.地震分辨率.勘探地球物理进展,2005,28(1):12~18
[5]俞寿朋.高分辨率地震勘探.北京:石油工业出版社,1993,1~34
[6]Sheriff R E.Li mitations on resolution of seismic re-flection and geologic detail derivable from them.AAPG Memoir26,1977,3~14
[7]Widess M A.How thin is a thin bed?Geophysics,1973,38(8):1176~1254
[8]李庆忠.走向精确勘探的道路——高分辨率地震勘探系统工程剖析.北京:石油工业出版社,1994,12~307
[9]Ma Zaitian,Jin Shengwen,Cheng Jiubin,Wang Hua-zhong.Quantitative esti mation of seismic i maging res-olution.SEG72nd Annual Meeting,2002,2281~2284
[2]http://www.agoil.cn/bbs/read.php?tid=178608
[3]李庆忠.地震勘探分辨率与信噪比谱的关系——答云美厚“地震分辨力新认识”一文.石油地球物理勘探,2008,43(2):244~245
[4]云美厚.地震分辨率.勘探地球物理进展,2005,28(1):12~18
[5]俞寿朋.高分辨率地震勘探.北京:石油工业出版社,1993,1~34
[6]Sheriff R E.Li mitations on resolution of seismic re-flection and geologic detail derivable from them.AAPG Memoir26,1977,3~14
[7]Widess M A.How thin is a thin bed?Geophysics,1973,38(8):1176~1254
[8]李庆忠.走向精确勘探的道路——高分辨率地震勘探系统工程剖析.北京:石油工业出版社,1994,12~307
[9]Ma Zaitian,Jin Shengwen,Cheng Jiubin,Wang Hua-zhong.Quantitative esti mation of seismic i maging res-olution.SEG72nd Annual Meeting,2002,2281~2284
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