物探与化探Issue(1)：90-95,6.DOI:10.11720/j.issn.1000-8918.2014.1.16
井中磁测资料预处理与弱信号识别
DATA PREPROCESSING AND WEAK SIGNAL DETECTION IN BOREHOLE MAGNETIC SURVEY
摘要
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.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Key words
borehole magnetic survey/weak signal detection/tilt-angle/analytical signal amplitude/normalizing with a mean value分类
天文与地球科学引用本文复制引用
王赛昕,刘天佑,欧洋,高文利,邱礼泉,冯杰..井中磁测资料预处理与弱信号识别[J].物探与化探,2014,(1):90-95,6.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 （）
