摘要
在总结前人对震电效应理论和实验研究现状的基础上,指出了井中震电勘探的特殊性.利用自行设计的实验系统,实验考察了直流电场对井液声学性质的影响,并对实验现象做了机理探讨.发现:当使用小功率直流电源(32V,3A)对NaCl溶液(20000mg/L)施以直流电场时,与电流强度和作用时间有关的电解导致了溶液物理化学组分的变化,当OH-取代Cl-时,可以使溶液的声速和幅度增大,但同时出现的气体(H2、Cl2),特别是H2导致了"气泡幕"的发生,对声波能量(幅度)的影响是决定性的,实验结果和机理分析有助于丰富对井中震电勘探实验现象的认识.
The study status on theory and experiment of seismo\|electric is summarized. The speciality of seismo\|electric in borehole is put forward. With the employment of a special experimental system, the variation of acoustic parameter is simulated in the mud with 20 000 mg/L NaCl solution affected by low power DC(32V,3A). Based on the experimental phenomena objected, the mechanism of electrolysis is analyzed. The result shows that remarkable variation of P\|wave amplitude and velocity with the current and time is related to the electrolysis process in which the ingredients of solution are changed. When OH- replaces the Cl- , the velocity and amplitude will increase, At the same time, the appearance of gas(H2 and Cl2),especially, the H2 bubble is decisive to acoustic amplitude. The experimental phenomena and mechanism's analysis are helpful to enrich the knowledge to seism\|electric in borehole.
出处
《地球物理学进展》
CSCD
2004年第2期399-403,共5页
Progress in Geophysics
基金
中国博士后基金资助.
