直流电法勘探中“干扰场”形成机理、表现特征及应用浅析:《华南地质与矿产》2007年03期

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直流电法勘探中“干扰场”形成机理、表现特征及应用浅析

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周金华 黄经明 覃永炎 黄革非

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/irrnA*_0【摘要】:电法勘探野外观测中常遇到干扰电场,影响观测精度和工作效率,有时甚至使观测无法开展。对干扰场进行研究,从干扰场中获取有用信息,把干扰场应用于地质找矿中有着十分重要的意义。经观测发现,干扰场以直流脉冲型为主;以直流渐变型和低频波动型为辅。通过己知矿区的试验应用表明:在良导矿床和构造破碎带上,干扰场强度有明显的异常出现,表明干扰场异常与矿体及其他物化探异常有一定的对应关系,异常形态及走向与矿体的走向和产状有关,且干扰场异常具有重现性和规律性。通过对干扰场的研究,可解决一些地质问题。

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湖南省湘南地质勘察院 湖南省湘南地质勘察院 湖南省湘南地质勘察院 湖南省湘南地质勘察院水利论文6T7fT g#I

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电法勘探 干扰场异常 矢量测量 形成机理 干扰电场 干扰场强 地质问题 异常曲线 野外观测 观测精度水利论文&B(k+C u,[:D9DY

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!t;xk'Q5U8A0在直流电法勘探的野外观测中,经常遇到未知电场的干扰,其表现为指针摆动或读数有跳跃现象,影响观测精度和工作效率,有时甚至使工作无法开展。这种对电法勘探工作形成影响的未知电场称干扰场。在大、中型矿山、城市等用电量大的地区干扰场较强。而利用电法勘探方法在矿山周围水利论文g P;]ljI!b)TE

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