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声电测井是一种基于地层岩石的声电耦合效应探测的、特殊的井孔地球物理测井方法。自行研发的声电效应测井仪(AELT)在中国北部某油井进行了实际下井测试,通过使用声波信号和电信号同步采集的方式得到了该井声波发射时的声电同步接收信号,在井下观测到了声电效应测井理论所预期的伴随模式声电转换电信号和界面模式声电转换电信号。初步对比结果表明,伴随模式声电转换信号的波形组成成分以及频率特征与声波发射—声波接收信号的特征相似;在整个测量井段,纵横波信号能量与由此产生的声电信号能量相对较弱;而斯通利波信号能量与由此产生的声电信号能量相对较强,且二者随深度的变化趋势具有很高的相关性。界面模式声电转换信号到时几乎不会随源距和地层深度的变化而改变,其能量与常规测井数据之间具有很高的相关性。结合由声波信号转换出的电信号的相关特征,有可能为裸眼井地层参数评价提供新的参考依据。
Acoustic logging is a special borehole geophysical logging method based on the acoustic-electrical coupling effect of formation rocks. The self-developed Acoustic Efficient Logging Tool (AELT) conducted an actual downhole test at an oil well in northern China and obtained the acoustic-electrical synchronous receiving signal when the sound wave was emitted by using the synchronous acquisition of acoustic signals and electrical signals. Accompanied mode acoustoelectric conversion electric signal and interface mode acoustoelectric conversion electric signal expected by acousto-electric logging theory were observed. The preliminary comparison results show that the waveform components and the frequency characteristics of the Acousto-electrical conversion signal are similar to the characteristics of the acoustic emission-acoustic wave received signal. The energy of the S-wave signal and the acoustic-wave signal generated by this method are relatively The energy of Stoneley wave signal and the acoustic signal generated by it are relatively strong, and both have a high correlation with the trend of depth variation. The interface mode electro-acoustic conversion signal almost does not change with source distance and formation depth, and its energy is highly correlated with conventional well logging data. Combined with the related features of the electrical signals converted from acoustic signals, it is possible to provide a new reference for the evaluation of formation parameters of open-hole wells.