利用外部噪声拾取法压制大钻干扰波
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摘要
文中基于详细分析大钻干扰波的传播规律及其在不同域中的表现特征,提出了在炮域拾取大钻干扰波进行区域静校正压制干扰波的方法(拾取法)。具体做法是:在存在大钻干扰的单炮记录上拾取同一时间段的干扰波曲线,将各干扰波曲线拾取值分别减去极小拾取值,得到各道静校正量;利用区域静校正对干扰波曲线进行静校正拉平处理;然后采用F-K滤波法对拉平的地震干扰波进行衰减;最后通过对资料进行区域反时移校正,得到去噪后单炮记录。理论分析及实际资料处理结果表明,拾取法无需事先知道大钻干扰波的频率、振幅,简单实用、精度高,对有效反射波的影响小,去噪效果优于随机噪声衰减法、陷波法,能更好地满足高保真、高分辨率的岩性处理要求。
Based on the propagation law of the interference wave from the drilling site and its presentation characteristics,a new interference wave suppression method was proposed in this paper,in which the drilling interference was picked up first in shot domain and then the regional static correction was conducted.The exact workflow can be expressed below:at first an interference wave curve for a time interval in the single shot record in which the drilling interference exists was picked up,the static correction values for each trace can be obtained by subtracting the minimum value from the picked-up value of the interference wave curve,the static correction flatten processing for the interference wave curve was conducted by using regional static correction values,then F-K filtering method was utilized to attenuate the flatten seismic interference wave,at last the reverse time-shift correction was conducted to obtain the de-noised single shot records.The theoretical analysis and field data processing results show that the method does not need to know the frequency and the amplitude of the drilling interference,it is single,practical and accurate,it has small impact to effective reflection wave,its denoising effect is better than random noise suppression method and notching method,it could better meet the need of high fidelity and high resolution requirement in seismic data processing for lithology identification purpose in oil exploration.
Based on the propagation law of the interference wave from the drilling site and its presentation characteristics,a new interference wave suppression method was proposed in this paper,in which the drilling interference was picked up first in shot domain and then the regional static correction was conducted.The exact workflow can be expressed below:at first an interference wave curve for a time interval in the single shot record in which the drilling interference exists was picked up,the static correction values for each trace can be obtained by subtracting the minimum value from the picked-up value of the interference wave curve,the static correction flatten processing for the interference wave curve was conducted by using regional static correction values,then F-K filtering method was utilized to attenuate the flatten seismic interference wave,at last the reverse time-shift correction was conducted to obtain the de-noised single shot records.The theoretical analysis and field data processing results show that the method does not need to know the frequency and the amplitude of the drilling interference,it is single,practical and accurate,it has small impact to effective reflection wave,its denoising effect is better than random noise suppression method and notching method,it could better meet the need of high fidelity and high resolution requirement in seismic data processing for lithology identification purpose in oil exploration.
引文
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[3]张占杰,陈茂根,龚定康等.地震干扰波的衰减方法及其应用.海洋石油,2006,26(3):9～13
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[2]王立歆,韩文功,吕小伟等.地震资料中的大钻干扰波分析及压制方法.石油地球物理勘探,2007,42(5):526～534
[3]张占杰,陈茂根,龚定康等.地震干扰波的衰减方法及其应用.海洋石油,2006,26(3):9～13
[4]李文艳,牛彦良,吴明华.消除50Hz干扰波的地震资料处理新方法.大庆石油地质与开发,2001,20(5):67～68
[5]邹才能,张颖.油气勘探开发实用地震新技术.北京:石油工业出版社,2002,152～153
[6]韩文功.胜利油气地球物理技术论文集(2003～2004).北京:石油工业出版社,2004,64～70
[7]董敏煜.地震信号分析.山东东营:石油大学出版社,1990
[8]渥.伊尔马滋.地震数据处理.北京:石油工业出版社,1994,59～67
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