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利用快速付氏变换技术对测井曲线的采样序列进行频谱分析,以功率谱形式表示其频谱特性。曲线的低频成分是主成分,高频成分是干扰,近似认为两者在频带上是分离的。采用频域乘积滤波方法对曲线进行滤波加工。利用插值功率谱互相关可以迅速地确定两曲线对应层位的厚度比,从而解决了常规相关对比所遇到的困难,实现快速曲线对比。编制了数字滤波及快速曲线对比程序,给出在煤田测井资料数字处理中的应用实例。
The fast Fourier transform technique is used to analyze the sampling sequence of the logging curve and express its spectral characteristics as a power spectrum. The low-frequency component of the curve is the main component, the high-frequency component is the interference, it is approximately considered that the two are separated in the frequency band. The product of frequency domain filtering is used to filter the curve. Interpolation of interpolation power spectrum can be used to quickly determine the thickness ratio of the two curves corresponding to the horizon, thus solving the difficulties encountered in the conventional correlation comparison and achieving fast curve comparison. The digital filtering and fast curve comparison program are compiled, and the application example of logging data in coalfield is given.