| 低频交变压差作用下岩心流动电流和zeta电势实验测量 |
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| 引用本文： | 王军,胡恒山,杨光,李新,李国英,程希.低频交变压差作用下岩心流动电流和zeta电势实验测量[J].地球物理学报,2011,54(8):2169-2176. |
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| 作者姓名： | 王军 胡恒山 杨光 李新 李国英 程希 |
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| 作者单位： | 1. 哈尔滨工业大学航天学院,哈尔滨 150001;
2. 中国石油集团测井有限公司技术中心,西安 710021 |
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| 基金项目： | 国家公益事业(地震)行业专项基金(200808072),国家自然科学基金项目(41174110,40874062),中国石油天然气集团公司科研项目资助. |
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| 摘 要： | 实验测量岩样zeta电势,对于认识地震诱导的电磁场现象以及探索利用动电效应的测井方法具有重要意义.本文介绍了专门设计的岩样流动电流和流动电势实验测量系统及一种获得岩样zeta电势的测量方法——流动电势和流动电流综合测量法.实验采用交流锁相放大技术,测量了3～100 Hz频率范围内交变压差作用下岩样的流动电势系数和流动电...
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| 关 键 词： | 流动电势 流动电流 动电效应 zeta电势 动电耦合系数 |
| 收稿时间： | 2010-07-12 |
Experimental measurements on streaming current and zeta-potential of core samples under the excitation of low-frequency sinusoidal pressure |
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| WANG Jun,HU Heng-Shan,YANG Guang,LI Xin,LI Guo-Ying,CHENG Xi.Experimental measurements on streaming current and zeta-potential of core samples under the excitation of low-frequency sinusoidal pressure[J].Chinese Journal of Geophysics,2011,54(8):2169-2176. |
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| Authors: | WANG Jun HU Heng-Shan YANG Guang LI Xin LI Guo-Ying CHENG Xi |
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| Institution: | 1. Department of Astronautics and Mechanics,Harbin Institute of Technology, Harbin 150001,China;
2. China Petroleum Logging Co.Ltd., Xi'an 710021,China |
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| Abstract: | The experimental measurements on zeta potential are important for the study of the electrokinetic phenomena during an earthquake and of the electrokinetic well logging methods. An experimental test system is devised to measure the rock streaming potential and streaming current.By employing the AC lock-in technique, the streaming potential coefficient and streaming current coefficient are experimentally obtained at the low frequency range between 3 and 100 Hz. The experimental results show that both coefficients decrease as the ion concentration increases, and grow as the solution pH value increases. By combining the streaming potential and streaming current measurements at different concentrations, the effective surface-to-length ratio of a core sample is obtained, which is used to calculate the zeta-potential and the surface conduction. The results also demonstrate that the neglect of surface conduction as in the conventional streaming potential method leads to underestimation of the zeta potential at the low concentrations. |
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| Keywords: | Streaming potential Streaming current Electrokinetic effects Zeta-potential Electrokinetic coupling coefficient |
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