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作 者:谢明宏[1,2] XIE Minghong(CNNC Key Laboratory for Geophysical Exploration Technology Center of Uranium Resource Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang 050002,China;CNNC Key Laboratory for Geophysical Exploration Technology Center of Uranium Resource Hebei Key Laboratory of Airborne Survey and Remote Sensing Technology,Shijiazhuang 050002,China)
机构地区:[1]核工业航测遥感中心铀资源地球物理勘查技术中心重点实验室,石家庄050002 [2]核工业航测遥感中心河北省航空探测与遥感技术重点实验室,石家庄050002
出 处:《物探化探计算技术》2022年第3期344-352,共9页Computing Techniques For Geophysical and Geochemical Exploration
基 金:中国核工业地质局基础地质专项(201722-3)。
摘 要:为探索不同电磁方法在低阻区的有效探测深度及砂体识别能力,从铀矿地质勘查工作的实际出发,在松辽盆地北部低阻覆盖区昌盛地段开展了可控源音频大地电磁法(CSAMT)和广域电磁法的对比试验。通过试验剖面资料的反演处理,结合研究区地质及钻探资料的综合分析,总结了两种方法在低阻区的有效探测深度和对不同岩性的分辨能力。通过对二者原始数据曲线和各自频率特性对比,分析了两种不同方法的有效探测深度,并结合钻孔资料对两者的剖面反演结果进行了对比研究。研究结果表明,CSAMT法在低阻区对埋深800 m以浅的“泥-砂-泥”互层能够有效识别;广域电磁法在同一低阻区其有效探测深度大于CSAMT法(超过800 m)。因此,在松辽盆地低阻区,CSAMT适用于探测目标体埋深≤800 m的区域,而广域电磁法可适用于解决更深目标体的探测问题。In order to explore the effective prospecting depth and sand body identification ability used by different electromagnetic methods in lower resistivity area,the comparison test both controlled-source audiomagnetotelluric(CSAMT)and wide area electromagnetic methods was carried out in Changsheng area with low resistivity cover area of north Songliao basin according to the actual situations of uranium geological exploration.Based on inversion data in a test section,combining with comprehensive analysis of geology and drilling data in the study area,effective prospecting depth and various lithology resolution of the two methods in the lower resistivity area are summarized.The basic principle and data processing procedure of the two methods are briefly introduces in this paper.The analysis on effective depth of the two methods by comparing their raw data curves and their respective frequency characteristics are made.The inversion results of the two methods are compared by combining to the drilling data.The results show that CSAMT method can effectively identify interlayered structure of"mud-sand-mud"at depth of shallower than 800 meters in the lower resistivity area,whereas wide area electromagnetic method can detect at depth of deeper than 800 meters.Thus,in the lower resistivity area of north Songliao basin,CSAMT method is suitable for the detecting target body over the buried depth of 800 meter and wide area electromagnetic method can be for the even deeper target body.
关 键 词:昌盛地段 低阻区 CSAMT 广域电磁 有效探测深度
分 类 号:P631.2[天文地球—地质矿产勘探]
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