瞬变电磁在资料解释中如何消除低阻屏蔽  

Elimination of Low Resistivity Shielding in TEM Data Interpretation

作　　者：龚惠民[1] 马瑞华[1] 段建华[1] 

机构地区：[1]中国煤炭地质总局水文物测队,河北邯郸056001

出　　处：《中国煤田地质》2007年第A02期126-127,134,共3页Coal Geology of China

摘　　要：常规的瞬变电磁资料处理解释方法是对野外采集的归一化二次电位数据通过公式计算转化为视电阻率值,然后针对各目的层绘制等视电阻率平面图,并通过对平面图的解释圈定出异常区域。由于受浅层低阻屏蔽影响,使得绘制出的平面图从浅层到深层的视电阻率等值线形态非常相似,若浅部存在低阻层,则对深部的异常进行解释难度较大。利用原始的归一化二次电位差值方法可消除低阻屏蔽的影响,该方法在山西潞安集团司马煤业有限公司的应用,验证了其勘探效果。The conventional TEM data processing and interpretation methods are through conversion formula inversion of field collected normalized secondary potential data into apparent resistivity values and then focused on each target to plot apparent resistivity contours, and through analysis and interpretation of plans to circle out anomalous regions. Due to influences from shallow low resistivity shielding make the plans of apparent resistivity contours very similar from shallow to deep part, so if there are low resistivity layers in shallow part, then interpretation of anomalies in deep part can be quite difficult. The paper introduced the original normalized secondary potential difference method in transient electromagnetic data processing can eliminate impact of low resistivity shielding. Ideal results have been obtained in application of the method in the Shanxi Luan Sima Coal Group Limited.

关 键 词：瞬变电磁 低阻屏蔽 二次电位 差值 

分 类 号：P631.325[天文地球—地质矿产勘探]