| 井中磁测资料预处理与弱信号识别 |
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| 引用本文： | 王赛昕,刘天佑,欧洋,等.井中磁测资料预处理与弱信号识别[J].物探与化探,2014(1):90-95. |
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| 作者姓名： | 王赛昕 刘天佑 欧洋 等 |
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| 作者单位： | [1]中国地质大学地球物理与空间信息学院,湖北武汉430074 [2]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000 |
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| 基金项目： | 国土资源部“十二五”项目（1212011120195）、国土资源部公益性行业科研专项（20091101703） |
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| 摘 要： | 井中磁测仪器距离场源近,磁测资料受到钻孔打穿磁性体产生的内磁场影响,往往存在强干扰压制有用信号,因此研究井中磁测资料预处理与弱信号识别方法具有重要意义。笔者将地面重磁资料边界识别中倾斜角总水平导数和解析信号振幅方法改进后应用于井中磁测资料预处理中,提出倾斜角垂向导数和均值归一解析信号振幅方法。通过模型分析证明了两种方法都可识别强弱不同的井旁磁性体位置,反映边界信息,且给出了计算均值归一解析信号振幅过程中窗口选择的依据。将两种方法应用于江苏某工区ZK002孔磁测资料预处理中,得出倾斜角垂向导数方法应用于实测资料中会放大干扰,而均值归一解析信号振幅方法增强了该钻孔弱异常信息,且压制了干扰信号,处理结果与磁化率测井和钻孔资料相对应。
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| 关 键 词： | 井中磁测 弱信号识别 倾斜角 解析信号振幅 均值归一 |
DATA PREPROCESSING AND WEAK SIGNAL DETECTION IN BOREHOLE MAGNETIC SURVEY |
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| WANG Sai-xin,LIU Tian-you,OU Yang,GAO Wen-li,QIU Li-quan,FENG Jie.DATA PREPROCESSING AND WEAK SIGNAL DETECTION IN BOREHOLE MAGNETIC SURVEY[J].Geophysical and Geochemical Exploration,2014(1):90-95. |
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| Authors: | WANG Sai-xin LIU Tian-you OU Yang GAO Wen-li QIU Li-quan FENG Jie |
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| Institution: | 1.Institute of Geophysics and Geomatics,China Universty of Geosicences,Wuhan 430074,China;2.Institute of Geophysical and Geochemical Exploration,CAGS,Langfang 065000,China) |
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| Abstract: | As the logging instrument is placed near the field source, the borehole magnetic data are likely to be affected by the internal magnetic field when the drill hole penetrates the magnetic body. As a result, the useful signal is often suppressed by strong jamming and not easy to identify. Therefore, it is important to find a method which can identify the weak signal through data preprocessing. In this paper, the methods for ground survey, called total horizontal derivate of tilt-angle and analytical Signal Amplitude, were used in bore-hole magnetic survey. The authors proposed vertical derivative of tilt-angle through coordinate transformation and a new method called Equalized Analytical Signal Amplitude. Through data processing of the model, the authors point out that the two kinds of methods can both identify the magnetic body and give the boundary information. The authors also give a standard to choose a suitable window to cal-culate the Equalized Analytical Signal Amplitude. The two kinds of methods were applied to Jiangsu ZK002 borehole magnetic data pre-processing. The vertical derivative of tilt-angle enlarged the interference of data, wheres the Equalized Analytical Signal Amplitude uses normalized method to identify the weak signal and suppress the interference. The Equalized Analytical Signal Amplitude is also well consistent with the results of magnetic susceptibility logging and the borehole data in ZK002. |
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| Keywords: | borehole magnetic survey weak signal detection tilt-angle analylieal signal amplitude normalizing with a mean value |
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