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Induction logging technique

机译:感应测井技术

摘要

A method and system for processing induction measurements of sub-surface formations taken by an induction logging system at various depths in a borehole is disclosed. The method reduces the unwanted contributions in each measurement from induction currents flowing in the formations spaced apart from each measurement depth. The spatial domain sonde response function obtained at zero conductivity is Fourier transformed and truncated at a spatial frequency less than the spatial frequency at which the transformed function first goes to zero. A Kaiser window transfer function is then selected and the inverse Fourier transform of the ratio of the Kaiser window function to the transformed truncated sonde response function is formed to obtain a deconvolution filter function which when convolved with the sonde response function reduces the non-zero sidelobes in the system response function and thus reduces the shoulder effect.
机译:公开了一种用于处理由感应测井系统在井眼中的各个深度处进行的地下地层的感应测量的方法和系统。该方法减少了在与每个测量深度间隔开的地层中流动的感应电流在每个测量中的不想要的贡献。在零电导率下获得的空间域探空仪响应函数经过傅立叶变换,并在空间频率小于变换函数首次变为零的空间频率处被截断。然后选择Kaiser窗传递函数,并形成Kaiser窗函数与变换后的截短的探空仪响应函数之比的傅立叶逆变换,以获得解卷积滤波函数,当与探空仪响应函数卷积时,可减少非零旁瓣在系统响应功能,从而减少肩效应。

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