摘要
通过观测点的地形对瞬变电磁法(TEM)相关资料的影响分析,结果表明其大小不但与地形的变化幅度有关,也与表层电阻率高低、观测延时有关。通过模拟计算与实际应用,验证了地形对TEM资料影响的规律。地形对TEM资料影响的实质是地形起伏促使涡流聚散,致使感应场升高或降低,导致TEM视电阻率变化与地形起伏反向。根据地形对TEM资料影响的规律,可采用适当方法进行地形影响校正。
This paper analyses the influence of terrain of observation point on data collection and the conversed apparent resistivity of transient electromagnetic method（TEM）, the amplitude of influence is not only associated with the change of the terrain, but also with surface resistivity and observation time delay. The simulation results accord with the experimental results, verifying the influence law of topography on the TEM data. The essence of the terrain effect on TEM data is that undulating terrain prompts eddy current to aggregate or diverge, resulting in the induction field to increase or decrease, making TEM apparent resistivity change with topography reversely. According to the law of the impact of topography on TEM data, the appropriate correction may be used.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2017年第6期139-142,共4页
Coal Geology & Exploration
基金
国家自然科学基金项目(41374150)~~
关键词
瞬变电磁法
视电阻率
地形起伏
涡流聚散
感应场
校正
transient electromagnetic method
apparent resistivity
topographic relief
eddy current aggregation or divergence
induction field
correction
