矿井孔中瞬变电磁测量方法及其应用研究
发布时间：2018-08-17 12:02
【摘要】：受测井技术的启发,为增强对井下钻孔空间的利用,结合矿井瞬变电磁技术对煤矿富水区探测的优越性,作者开展了矿井孔中瞬变电磁测量方法及其应用的系统研究,具体地:设计了适用于孔内狭小空间的探测装置,推导了适用于该装置的孔中瞬变电磁场响应理论公式,开展了针对低阻异常体的室内与室外两类物理模拟实验,并深入矿井利用井下钻孔实测实验进行了验证,由此形成了矿井孔中瞬变电磁测量方法。取得的创新性认知与成果如下:(1)设计了孔内全方位瞬变电磁探测的探头形式,并推导了适用于该装置的孔中全空间瞬变电磁响应公式,并基于物理模拟实验、工地实测试验和矿井实测实验的开展提出了矿井孔中瞬变电磁法的数据处理分析方法。具体地,孔内全方位瞬变电磁探测的探头形式为对偶双发射、径向六分量接收;针对实验中背对低阻异常体的通道其接收信号会出现最小电压值这一规律,定义了“偏移量”的概念,从而建立了“测点-偏移量图”和异常位置“气泡图”等数据分析图件。(2)通过4项物理模拟实验、1项室外工地实测试验的开展,证明了论文所提出的孔中瞬变电磁测量方法能够有效地探测钻孔周边的低阻异常,并定位其空间方位。在室内模拟实验中发现:低阻异常基本正对某接收通道时,正对异常的三个通道为正响应且越靠近异常体的通道接收的信号幅值越高,背向异常的通道出现负信号响应且离异常越远的背向通道的负响应信号绝对幅值越大;当低阻异常体基本位于两个接收通道的中分线方向上时,这两个正对异常的通道所测信号为正响应,距离异常近者信号幅值高,其他四个通道的接收信号为负响应,且距离异常远的通道其负响应信号绝对幅值大。此外,低阻异常体大小会影响多测道剖面形态。在1:1的试验场地探测中进一步验证了该方法能够准确地判断低阻异常体的方向性。(3)通过2项矿井实测实验的开展证明了上述矿井孔中瞬变电磁法能够分辨钻孔围岩岩性的变化。矿井孔中瞬变电磁法的现场测试显示了该方法对于钻孔的岩性变化有着较为良好的反映:电阻率越低的岩层对应多测道剖面中的电压幅值越高,电阻率越高的岩层对应多测道剖面中的电压幅值就越低。
[Abstract]:Inspired by logging technology, in order to enhance the utilization of borehole space, combined with the superiority of mine transient electromagnetic technology in detecting water-rich areas in coal mines, the author has carried out a systematic study on the method and application of transient electromagnetic measurement in mine holes. Concretely, a detecting device suitable for the narrow space in the hole is designed, the theoretical formula of the transient electromagnetic field response in the hole is deduced, and the indoor and outdoor physical simulation experiments for the low resistivity abnormal body are carried out. The method of transient electromagnetic measurement in mine hole is formed. The innovative cognition and results obtained are as follows: (1) the probe form of omni-directional transient electromagnetic detection in the hole is designed, and the formula of the all-space transient electromagnetic response in the hole suitable for the device is deduced, and based on the physical simulation experiment, The data processing and analysis method of transient electromagnetic method in mine hole is put forward in this paper. Specifically, the probe form of omni-directional transient electromagnetic detection in the hole is dual double emission and radial six-component receiving. In view of the rule that the received signal will appear the minimum voltage value in the channel of the back-to-low resistivity abnormal body in the experiment, The concept of "migration" is defined, and the data analysis maps such as "point-migration map" and "bubble map" of abnormal position are established. (2) through four physical simulation experiments, one outdoor site test is carried out. It is proved that the method proposed in this paper can effectively detect the low resistivity anomaly around the borehole and locate its spatial orientation. In the indoor simulation experiment, it is found that when the low resistivity anomaly is basically positive to a certain receiving channel, the positive response of the three positive channels to the anomaly and the higher the signal amplitude of the channel close to the abnormal body are obtained. The negative signal amplitude of the negative response signal of the channel with abnormal back direction and the farther away from the abnormal channel is larger, when the low resistivity anomaly body is basically located in the direction of the middle branch of the two receiving channels, the negative response signal amplitude of the channel with low resistivity anomaly is higher than that of the other channel. The two positive signals are positive response to the abnormal channel, the amplitude of the signal near the anomaly is high, the received signal of the other four channels is negative response, and the absolute amplitude of the negative response signal of the channel far away from the anomaly is large. In addition, the size of low resistivity anomaly will affect the shape of multi-trace profile. It is further verified that this method can accurately judge the directionality of low resistivity abnormal body in the 1:1 test site. (3) through two mine experiments, it is proved that the transient electromagnetic method in the mine hole can distinguish the lithologic change of the borehole surrounding rock. The field test of transient electromagnetic method in mine hole shows that the method can reflect the lithologic change of borehole well: the lower the resistivity, the higher the voltage amplitude in the multi-channel section. The higher the resistivity, the lower the voltage amplitude in the multi-trace profile.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.325
本文编号：2187566
[Abstract]:Inspired by logging technology, in order to enhance the utilization of borehole space, combined with the superiority of mine transient electromagnetic technology in detecting water-rich areas in coal mines, the author has carried out a systematic study on the method and application of transient electromagnetic measurement in mine holes. Concretely, a detecting device suitable for the narrow space in the hole is designed, the theoretical formula of the transient electromagnetic field response in the hole is deduced, and the indoor and outdoor physical simulation experiments for the low resistivity abnormal body are carried out. The method of transient electromagnetic measurement in mine hole is formed. The innovative cognition and results obtained are as follows: (1) the probe form of omni-directional transient electromagnetic detection in the hole is designed, and the formula of the all-space transient electromagnetic response in the hole suitable for the device is deduced, and based on the physical simulation experiment, The data processing and analysis method of transient electromagnetic method in mine hole is put forward in this paper. Specifically, the probe form of omni-directional transient electromagnetic detection in the hole is dual double emission and radial six-component receiving. In view of the rule that the received signal will appear the minimum voltage value in the channel of the back-to-low resistivity abnormal body in the experiment, The concept of "migration" is defined, and the data analysis maps such as "point-migration map" and "bubble map" of abnormal position are established. (2) through four physical simulation experiments, one outdoor site test is carried out. It is proved that the method proposed in this paper can effectively detect the low resistivity anomaly around the borehole and locate its spatial orientation. In the indoor simulation experiment, it is found that when the low resistivity anomaly is basically positive to a certain receiving channel, the positive response of the three positive channels to the anomaly and the higher the signal amplitude of the channel close to the abnormal body are obtained. The negative signal amplitude of the negative response signal of the channel with abnormal back direction and the farther away from the abnormal channel is larger, when the low resistivity anomaly body is basically located in the direction of the middle branch of the two receiving channels, the negative response signal amplitude of the channel with low resistivity anomaly is higher than that of the other channel. The two positive signals are positive response to the abnormal channel, the amplitude of the signal near the anomaly is high, the received signal of the other four channels is negative response, and the absolute amplitude of the negative response signal of the channel far away from the anomaly is large. In addition, the size of low resistivity anomaly will affect the shape of multi-trace profile. It is further verified that this method can accurately judge the directionality of low resistivity abnormal body in the 1:1 test site. (3) through two mine experiments, it is proved that the transient electromagnetic method in the mine hole can distinguish the lithologic change of the borehole surrounding rock. The field test of transient electromagnetic method in mine hole shows that the method can reflect the lithologic change of borehole well: the lower the resistivity, the higher the voltage amplitude in the multi-channel section. The higher the resistivity, the lower the voltage amplitude in the multi-trace profile.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.325
【参考文献】
相关期刊论文 前3条
1 嵇艳鞠;林君;于生宝;王忠;王静;;ATTEM系统中电流关断期间瞬变电磁场响应求解的研究[J];地球物理学报;2006年06期
2 罗平平;范波;;深部矿井底板隐伏含水构造瞬变电磁探测应用[J];山东科技大学学报(自然科学版);2010年05期
3 胡雄武;张平松;程桦;吴荣新;郭立全;;井下瞬变电磁法超前探测中锚杆干扰定量评价[J];岩石力学与工程学报;2013年S2期
相关博士学位论文 前1条
1 胡雄武;巷道前方含水体的瞬变电磁响应及探测技术研究[D];安徽理工大学;2014年
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