直流电法勘探中"干扰场"形成机理、表现特征及应用浅析

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。

Principle of Formation and Characteristics of Expression and Application of Clisturbing Field in D.C. Electric Method

Disturbing field in D.C.electric method affects the precision and efficacy of field observation,sometimes,field observation can not be finished.So,there is an important significance that we study it,draw useful information from it and use it for prospecting.The authors summarize some results of disturbing electric field obtained in D.C.electric method prospecting of metal exploration and consider that the disturbing electric field can be divided into three types,the D.C.pulse,the D.C.gradual change and the low frequency wave motion.The D.C.pulse is the major type and the low frequency wave motion is an assistant.The experiment in several deposit field showing that the intensity of disturbing field relate to good conductor geological body and that the anomaly of disturbing field relate to ore body or other geophysical and geochemical anomalies and that the shape of anomalies relate to the attitude of ore body.Some geological problems will be solved when the disturbing field is studied.