基于双模式并行电法采集系统的激发极化法实验研究

发布时间：2019-02-16 19:16

【摘要】：激发极化法作为一种有效的地球物理勘探方法,在金属矿寻找、油气勘探、煤田勘探以及地质普查等领域有着广泛的应用。基于双模式并行电法采集系统在采集方法、装置形式、采集效率等方面的独特优势,结合电子电路模拟、物理模拟和实际应用进行了激发极化法的实验研究。(1)试验研究激发极化的充、放电过程,在用铜棒模拟高极化体介质条件下,发现供电后的0.1s内激发极化过程已完成50%,0.5s内激发极化过程完成90%;因此,采用激发极化法的视幅频率计算时,可以选用供电0.5s的视电阻率作为低频视电阻率,高频视电阻率按照背景噪声水平选择,从而可显著提高有高极化体时的IP勘探效率;(2)搭建电路模型,模拟了激发极化现象中出现的负极化现象。根据Cole-Cole模型,把大地看作有多个极化单元构成的复杂的分压网络。通过模拟发现,当存在高极化体时,极化占主导作用;当没有高极化体时,分压占主导作用,某一低极化体在极化完成之后可将其作为一个有固定阻值的电阻,而其他未完成极化的极化体仍在充电其电阻值不断升高,分得的电压也不断增加,导致已完成极化的低极化体分得的电压变低,从而出现负极化现象;(3)双模式并行电法采集系统,采集一次AM数据可以从中提取出两个单边三极装置(AMNMNB)以及四极装置(温纳α装置、温纳β装置以及温纳γ装置),在增加采集装置的多样性同时采集效率也显著提高。将由AM数据合成的四极数据与单独用四极装置采取数据进行对比,视电阻率变化的均方根误差α装置为0.01、β装置为0.02、γ装置为0.24;视幅频率变化的均方根误差α装置为3.4、β装置为13.8、γ装置8.7;通过视电阻率与视幅频率联合反演之后均可以较为准确的反应异常体位置;(4)视电阻率连续监测法作为随掘底板监测的一种有效手段,可将双模式并行电法采集系统应用于随掘煤巷底板的监测,利用其在极化数据采集上的优势,将视幅频率作为视电阻率数据解释的一种辅助手段,可以对视电阻率法不敏感区域进行补充解释。
[Abstract]:As an effective geophysical exploration method, the induced polarization method has been widely used in metal ore prospecting, oil and gas exploration, coalfield exploration and geological survey. Based on the unique advantages of the dual mode parallel electrical acquisition system in the aspects of acquisition method, device form and collection efficiency, combined with electronic circuit simulation, The physical simulation and practical application are studied experimentally. (1) the charge and discharge process of the excited polarization is studied experimentally. Under the condition of simulating the high polarimetric medium with copper rod, It was found that the process of excitation polarization within 0.1 seconds after power supply had been completed in 50 and 0.5 seconds, and the process of excitation polarization had been completed in 90 parts. Therefore, the apparent resistivity of 0.5 s power supply can be selected as the low frequency apparent resistivity, and the high frequency apparent resistivity can be selected according to the background noise level. Thus, the efficiency of IP exploration with high polarizability can be improved significantly. (2) the circuit model is built to simulate the negative polarization phenomenon. According to the Cole-Cole model, the earth is regarded as a complex partial pressure network with multiple polarization elements. It is found by simulation that polarization plays a dominant role when there is a high polarizer. When there is no high polarizer, the partial voltage dominates. A low polarizer can treat it as a resistance with a fixed resistance after the polarization is completed, while the other polarizers that have not completed the polarization are still charging their resistance values increasing. The obtained voltage is also increasing, which leads to the low polarizability of the completed polarizer to get lower voltage, resulting in the phenomenon of negative polarization. (3) Dual-mode parallel electric method acquisition system, from which two one-sided tripole devices (AMNMNB) and quadrupole devices (Winner 伪 device, Winner 尾 device and Winner 纬 device) can be extracted from a single AM data acquisition system. At the same time, the collection efficiency is also improved significantly. Comparing the quadripole data synthesized from AM data with the data taken by the quadrupole device alone, the RMS error 伪 device of apparent resistivity change is 0.01, the 尾 device is 0.02, and the 纬 device is 0.24. The root mean square error (RMS) of amplitude-frequency variation is 3.4, 尾 is 13.8and 纬 is 8.7.The abnormal body position can be accurately reflected by the combination inversion of apparent resistivity and apparent amplitude frequency. (4) as an effective means of monitoring the bottom plate, the continuous monitoring method of apparent resistivity can be used to monitor the bottom plate of coal roadway by using the dual mode parallel electric method acquisition system, and its advantage in polarization data acquisition can be taken advantage of. The amplitude frequency can be used as an auxiliary means for interpretation of apparent resistivity data, which can be used to explain the insensitive area of apparent resistivity method.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631.324

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