地—井瞬变电磁资料矢量交会解释方法  

A study of vector intersection for borehole transient electromagnetic method

作　　者：张杰[1] 邓晓红[1] 谭捍东[2] 吕国印[1] 武军杰[1] 王兴春[1] 杨毅[1] 

机构地区：[1]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000 [2]中国地质大学地球物理与信息技术学院,北京100083

出　　处：《物探与化探》2015年第3期572-579,共8页Geophysical and Geochemical Exploration

基　　金：中国地质调查局地质大调查项目(12120113100500);中国地质科学院地球物理地球化学勘查研究所基本科研业务费项目(AS2007J08)

摘　　要：以往地—井瞬变电磁法资料解释研究主要为定性解释。本文在瞬变电磁等效涡流的理论基础上,通过研究等效场矢量的空间特征,发现感应二次场矢量的方向与一次场强度、观测点距离及观测时间均无关,只与观测点的方位有关,经简单的修正,二次场特征矢量就可以交会于异常中心位置。研究的地—井瞬变电磁矢量交会法是一种新的定量解释方法,该方法通过绘制每个测点的特征矢量,根据异常区矢量交会于一点的规律,确定异常中心位置。分别采用理论模型和实测资料对该方法进行了验证,结果表明矢量交会法能够对井旁盲矿中心位置进行较准确地定位。Interpretation methods for borehole TEM data are mainly for qualitative interpretation, and their development has been very slow in spite of the fact that the borehole TEM method is an effective method to explore deep orebodies. This paper presents a new quan?titative interpretation method based on the equivalent vortex hypothesis. According to the relevant theory, the vectors of anomaly area can intersect at a point, and the anomaly center can be calculated by using the characteristic vector of each station. The method was tested by the interpretation of the model and field data, and the results show that the vector intersection method can be used to correctly locate the center of the blind orebody beside the borehole.

关 键 词：地—井瞬变电磁法 定量解释 矢量交会 纯异常场提取 等效电流环 

分 类 号：P631.325[天文地球—地质矿产勘探]