Analysis Of Factors Affecting Natural Source Slf Electromagnetic Exploration At Geothermal Wells

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Journal Article: Analysis Of Factors Affecting Natural Source Slf Electromagnetic Exploration At Geothermal Wells

Abstract
The Super Low Frequency (SLF) electromagnetic exploration was performed by using a nature source SLF electromagnetic detector at two geothermal wells in Peking University. The data of the SLF electromagnetic exploration at well JR-119 and JR-168 were obtained with the observation of continued five days and four times per day at well JR-119 and of one day at well JR-168. Based on these data, the influencing factors of the SI-F electromagnetic exploration were analyzed, which included the relationship between the nature source electromagnetic field and the time of observation, relationship between the sensor orientation and the received artificial electromagnetic interference, influence of weather conditions on the data quality and so on. The results showed that (1) There is an obvious day-night variation in the natural SLF signals, whereas the general envelopes of relative amplitude-frequency curves are repeatable and stable around the same time of different days; (2) The artificial electromagnetic interference field orientation is one of the influencing factors. When the long axis of sensor is parallel to the integrated axis of the artificial electromagnetic interference field, the noise is weakest. (3) Rain can exert great influence on the high frequency band of natural SLF signals.

Authors 
Q. M. Qin, B. S. Li, R. B. Cui, H. B. Jiang, Q. P. Wang, Z. X. Zhang and N. Zhang








Published Journal 
Chinese Journal of Geophysics-Chinese Edition, Date Not Provided





DOI 
Not Provided
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Citation

Q. M. Qin,B. S. Li,R. B. Cui,H. B. Jiang,Q. P. Wang,Z. X. Zhang,N. Zhang. . Analysis Of Factors Affecting Natural Source Slf Electromagnetic Exploration At Geothermal Wells. Chinese Journal of Geophysics-Chinese Edition. (!) .