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1. 发明申请

WO1997026559A1 METHOD FOR REMOVING BOREHOLE RUGOSITY NOISE FROM WELL LOG DATA 审中-公开
标题翻译：从井记录数据中去除井眼RU噪声的方法
公开(公告)号：WO1997026559A1
公开(公告)日：1997-07-24
申请号：PCT/US1996000449
申请日：1996-01-16
申请人： MOBIL OIL CORPORATION
发明人： MOBIL OIL CORPORATION , KEYS, Robert, G. , NIETO, John, A. , PANN, Keh , SCHMITT, Denis, P.
IPC分类号： G01V01/36
CPC分类号： G01V1/48 , G01V1/364 , G01V2210/32
摘要： A method for removing sinusoidal noise without affecting the response of the formation means that the actual formation responses of the logging tools are recovered, and the logs can be used quantitatively. Removal of sinusoidal noise from a log is accomplished in three steps. First, the log is reduced to a zero-mean, stationary series. Second, the wavenumber of the sinusoidal noise is identified by its peak in the Fourier amplitude spectrum (18). And third, the noise is removed by applying a zero-phase notch filter (46). In order to preserve the quantitative data integrity, the low wavenumber trend is kept. Preserving the quantitative data integrity is accomplished by approximating the log with a least-squares cubic spline which retains the overall log character, ignoring the sinusoidal noise. A zero mean stationary series is formed by subtracting the least-squares cubic spline from the data. The remaining steps, Fourier analysis and filtering are performed on the difference series. Recombining the filtered series with the spline restores the log data without the sinusoidal noise.
摘要翻译：一种在不影响地层响应的情况下消除正弦噪声的方法意味着恢复测井工具的实际地层响应，可以定量使用测井。从日志中去除正弦噪声分三步完成。首先，日志被减少到零均值，固定的系列。第二，正弦噪声的波数由傅立叶振幅谱中的峰值识别（18）。第三，通过应用零相位陷波滤波器（46）去除噪声。为了保持定量数据的完整性，保持低波数趋势。保持定量数据完整性是通过用保留总体对数字符的最小二乘三次样条逼近对数来实现的，忽略正弦噪声。通过从数据中减去最小二乘三次样条来形成零平均静止序列。对差分序列执行剩余步骤，傅立叶分析和滤波。将滤波后的系列与样条重新组合可恢复日志数据，而不会产生正弦噪声。

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