自然电位场的振动激励效应

摘要

Vibrator excitation generates not only reflections and refractions of wave fields on the subsurface interfaces but also electromagnetic waves with different frequencies. In this paper, we address the vibration-induced effects on the spontaneous potential field. The effects of controllable vibration on the spontaneous potential field were studied under real field geologic conditions. Experimental data confirmed that the vibration-induced effects on the spontaneous potential field do exist under field conditions. Monitoring records over a long time interval showed that there exist three information zones in the vibration-induced effects on the spontaneous potential field. These are the signal-varying zone, the extreme-stable zone, and the relaxation-recovery zone. Combined with different well-site data, it was concluded that the time-varying features of the anomalies in the information zones was closely related to the properties of the subsurface liquid (oil and water).%振动激发,不仅会在地下不同介质分界面上产生波动场的反射、折射等现象,同时还能激励产生不同频率的电磁波.本文介绍了自然电位场振动激励效应,也就是研究在野外地质条件下,可控震源振动对自然电位场变化规律的影响.试验资料证实试野外条件下自然电位场振动激励效应客观存在,并通过连续长时间的监测记录,表明振动激励产生的自然电位场效应有三个信息区,即信号变化区、极值稳定区、驰豫恢复区,结合在不同井旁的试验结果,提出信息区异常时间特性与地下介质内流体性质(油、水)密切相关.