CAJ | 학술논문

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。
정중자측의기거리장원근，자측자료수도찬공타천자성체산생적내자장영향，왕왕존재강간우압제유용신호，인차연구정중자측자료예처리여약신호식별방법구유중요의의。필자장지면중자자료변계식별중경사각총수평도수화해석신호진폭방법개진후응용우정중자측자료예처리중，제출경사각수향도수화균치귀일해석신호진폭방법。통과모형분석증명료량충방법도가식별강약불동적정방자성체위치，반영변계신식，차급출료계산균치귀일해석신호진폭과정중창구선택적의거。장량충방법응용우강소모공구ZK002공자측자료예처리중，득출경사각수향도수방법응용우실측자료중회방대간우，이균치귀일해석신호진폭방법증강료해찬공약이상신식，차압제료간우신호，처리결과여자화솔측정화찬공자료상대응。
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.