瞬变电磁勘探资料精准处理技术  

Research on precise processing technology for transient electromagnetic exploration data

作　　者：李建文 LI Jian-wen(Yangquan Coal Industry(Group)Co.,Ltd.,Yangquan 045000,China)

机构地区：[1]阳泉煤业(集团)有限责任公司,山西阳泉045000

出　　处：《陕西煤炭》2020年第4期161-165,173,共6页Shaanxi Coal

摘　　要：为探究如何提取深部异常体的弱信号,提高深部探测的分辨率,开展了瞬变电磁勘探资料精准处理技术实践。通过原始数据的甄别评估、数据的圆滑去噪、瞬变电磁边框效应和地形校正等手段,进行瞬变电磁资料的预处理。在资料精准处理时,首先进行瞬变电磁一维正演及建模,并以时深转换为基础,结合钻孔资料和三维地震成果,对电性标志层进行识别和精准定位;采用曲率法,对视电阻率断面图上的基于标志层上下范围的局部弱异常进行圈定,提取到深部弱异常信息。以堡子煤矿实测TEM资料进行二次处理,结果表明,该技术的结果解释更加精细和准确,可以为矿井防治水提供技术保障。In order to extract the weak signal of deep abnormal body and improve the resolution of deep exploration,the practice of precise processing technology of TEM exploration data was carried out.The pretreatment of transient electromagnetic data is done by means of raw data discrimination and assessment,data smoothing and denoising,transient electromagnetic framing effect and terrain correction.In the precise processing of data,first,one-dimensional forward modeling and modeling of TEM are carried out,and based on time depth conversion,combined with drilling data and three-dimensional seismic results,the electrical marker layer is identified and accurately positioned;then,curvature method is used to delineate the local weak anomalies based on the upper and lower range of the marker layer on the apparent resistivity section map,and extract the deep weak anomaly information.The results of the secondary processing of the measured TEM data in Baozi mine show that the interpretation of the results is more precise and accurate,which can provide technical support for the prevention and control of mine water.

关 键 词：瞬变电磁 视电阻率 一维正演 时深转换 电性标志层 

分 类 号：TD163.1[矿业工程—矿山地质测量]