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本文讨论实测长源距全波波形频谱分析的原理及主要影响因素,导出了频率分析误差的估计式。在此基础上,分析了全波波形每个周期的频谱变化规律,给出了一些常见岩石的纵波、横波和斯通利波的主频、次主频数值,并用计算机处理出了这三个波型O主频的连续变化曲线。尤其重要的是,在分析功率谱的基础上我们得到了指示气层的有效曲线DASP。本文所有结果全部是根据实际测井波形得到的,有关图表均为实例。
This paper discusses the principle and main influencing factors of the spectrum analysis of the measured long-range full-wave waveform and derives the estimation formula of the frequency analysis error. On this basis, the spectrum variation of every cycle of the full-wave waveform is analyzed and the fundamental and subordinate frequency values of the compressional wave, shear wave and Stoneley wave of some common rocks are given, and these three Waveform O frequency of the continuous curve. It is especially important that based on the analysis of the power spectrum we have obtained the effective curve DASP indicating the gas zone. All the results in this paper are based on the actual well waveform, the relevant charts are examples.