小秦岭地区激电对称四极测深变MN极距效果对比研究  

EFFECT COMPARISON OF VARIABLE MN POLAR DISTANCES IN IP SYMMETRICAL QUADRUPOLE SOUNDING IN XIAOQINLING AREA

作　　者：韩要记 常钰斌 秦长春 宋晓蛟 Han Yao-ji;Chang Yu-bin;Qin Chang-chun;Song Xiao-jiao(Second Comprehensive Geophysical Exploration Brigade Co., Ltd of Shaanxi Geological and Mineral Group, Xi′an 710016)

机构地区：[1]陕西地矿第二综合物探大队有限公司,西安710016

出　　处：《陕西地质》2021年第1期48-55,共8页Geology of Shaanxi

摘　　要：通过在测区内开展激电中梯剖面、对称四极测深法等激电工作,根据中梯剖面测量成果结合测区地质特征、地球物理特征,在AB极距不变的情况下,采用变MN极距进行测量。将测量结果进行初步解释,对比研究MN=1/6AB与MN=1/30AB引起异常变化的异同点。指出当激电异常体范围较小,埋深延展性有限的情况下,在规范范围内极距MN与AB的比值应尽量小,以提高横向分辨率;当异常体厚度较大或研究地层、中大断裂时,极距MN与AB的比值不受此限制。By conducting electric work such as electroelectric middle ladder section and symmetric quadrupole sounding method in the measuring area and according to the survey results of the middle ladder section and characteristics of geology and geophysics,measurement of variable MN pole distance has been made under constant AB polar distance.Based on interpretation of the measurement results and comparative study of abnormal changes,similarities and differences caused by MN=1/6AB and MN=1/30AB,it is proposed in this paper that the ratio between MN and AB should be minimal when the electrical shock anomaly small and in the case of limited buried depth ductility for improving the lateral resolution;the ratio between MN and AB should not be subject to this limitation when the abnormal thickness of studying stratum and fractures were medium to large scale.

关 键 词：激电中梯 对称四极测深 极化体 MN/2距 

分 类 号：P631.3[天文地球—地质矿产勘探]