CAJ | 학술논문

本文使用天然源超低频电磁探测仪对北京大学校园内两口地热井进行了超低频电磁探测试验,获得了1号地热井(京热119号井)连续五天、每天四个时刻的天然源超低频电磁探测数据以及2号地热井(京热168号井)单天的天然源超低频探测的数据.基于所获得的数据,开展了地热井的天然源超低频探测影响因素的研究,这些因素主要包括:天然源超低频电磁场和观测时间的关系、探头摆放方向与接收工频谐波干扰关系以及天气状况对观测数据质量的影响等.研究表明:(1)天然源超低频电磁探测信号存在明显的日夜交替变化,其中相对振幅-频率曲线在不同日期、同一邻近时刻总体的包络线具有较好的重复性和一定的稳定性;(2)工频谐波干扰场方向是影响因素之一,当仪器探头长轴方向与工频谐波干扰场的等效主轴方向平行时噪声影响最小;(3)雨天环境会对天然场源超低频信号中的高频部分造成较大影响.
본문사용천연원초저빈전자탐측의대북경대학교완내량구지열정진행료초저빈전자탐측시험,획득료1호지열정(경열119호정)련속오천、매천사개시각적천연원초저빈전자탐측수거이급2호지열정(경열168호정)단천적천연원초저빈탐측적수거.기우소획득적수거,개전료지열정적천연원초저빈탐측영향인소적연구,저사인소주요포괄:천연원초저빈전자장화관측시간적관계、탐두파방방향여접수공빈해파간우관계이급천기상황대관측수거질량적영향등.연구표명:(1)천연원초저빈전자탐측신호존재명현적일야교체변화,기중상대진폭-빈솔곡선재불동일기、동일린근시각총체적포락선구유교호적중복성화일정적은정성;(2)공빈해파간우장방향시영향인소지일,당의기탐두장축방향여공빈해파간우장적등효주축방향평행시조성영향최소;(3)우천배경회대천연장원초저빈신호중적고빈부분조성교대영향.
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 SLF 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.