复合波相对相位频率谱异常区分法
来源期刊：中南大学学报(自然科学版)2003年第5期
论文作者：张友山 席振铢 王鹤 王文 穆建宏
文章页码：547 - 550
关键词：复合波激电法;相对相位频率谱;异常;精密相干检测
Key words：complex wave induced polarization; relative phase spectrum; anomalous; precision coherent detection
摘 要：研究了复合波激电精密相干检测法.该方法采用复合波电流场源,对复合波信号进行精密相干检测,使待测信号频率与参考信号频率完全相同,它们之间的相位差严格固定;同时通过精确的多次叠加,提高信噪比,准确检测出复合波信号中各主频率的振幅和相位,并计算出各主频率之间的相对相位差,获取激电复合波相对相位频率谱信号;根据谱的低频段相对相位变化特征和高频段相对相位变化特征的差异,判别地下异常极化体的性质,达到区分激电异常性质的目的.此外,给出了多种地质体的激电复合波相对相位频率谱异常特征.应用结果表明:利用这些特征可实时、快速、直观地区分激电异常性质;该方法的观测系统轻便,观测精度高,抗干扰能力强,适用于快速普查和详查矿体,以及在生产矿山以高分辨率勘探深部矿体.
Abstract: The precision coherent detection method of complex wave induced polarization is developed recently ,in which the transmitted current waveform is complex wave while the received signal is also a complex wave signal. For the precision coherent detection method, the frequency of signal and reference can be considered as the same as one and the phase between the signal and the reference is fixed. It is successfully employed in the precision coherent detection method of complex wave induced polarization. The data acquisition and the stacking are completed easily and perfectly, and the amplitude and phase of the main frequencies contained in the multi-wave signal are detected successfully in measurement. Then, the relative phase and the relative phase spectrum of the main frequencies of the complex wave signal can be obtained respectively. The IP relative phase frequency spectrum of the complex wave signal has different characteristic curve from different kinds of underground targets,i.e., sulphide deposits, underground water, graphite, etc. Therefore, it is very useful for the anomalous discrimination and is used successfully in the reconnaissance geophysical survey and detailed survey, which is de- scribed by the example in this paper. This method and the instrument which consists of a transmitter and a receiver have the advantages of rapid survey, high precision, high noise rejection and high sensitivity. The depth estimation is improved obviously in the geophysical exploration.
