【摘要】 <正> 航空电磁法发展三十多年来,主要是用来寻找良导的金属矿床。因此,在资料解释中人们通常只对局部异常感兴趣,而忽视大面积背景场的变化。这样只有很少一部分资料得到利用。为了提高实测资料的使用价值,取得更多有关地质体的信息,必须对所测得的全部资料进行解释。于是人们提出将航电实测的二次场值变换为视电阻率,进行视电阻率填图,并期望在适宜的地质条件下根据视电阻率值来识别岩石类型,从而达到地质填图的目的。这个问题在理论上已经基本解决。就时间域航空电磁系统而论,国外已有均更多还原

【Abstract】 The recent work of AEM survey in our country shows that the time-domain AEM system is effective in geological mapping. In order to make full use of the data obtained, to eliminate the effect of flying height change and to express the results of AEM survey in apparent resistivity, a method of transforming the time-domain AEM response into apparent resistivity is studied in the paper. The method was used in two survey areas, Jiangxi and Hunan, and the excellent correlation between the maps of apparent resistivity and geological maps has been abtained. It proves that the AEM system can be employed in geological mapping and that the maps of apparent resistivity may be used to indicate an upwarped high-resistance body and a low-resistance conductor underlying Quaternary Period overburden. In addition, it has been found that the AEM system is specially sensitive to the strata of coal series so that it can bo used to explore coal deposits and outline the strata of coal series. In the region where the geology is less known, outcrops are scarce and the access is difficult, the methed has its special advantage and of economic benefits.更多还原