CSAMT法在柴北缘砂岩型铀矿勘查砂体探测中的应用  

Application of CSAMT method in sand-body detection of sandstone type uranium exploration in North Qaidam

作　　者：艾虎[1] 焦智伟 王泽霞[1] 汪来 祁程[1,2] 李茂 AI Hu;JIAO Zhiwei;WANG Zexia;WANG Lai;QI Cheng;LI Mao(Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang 050002,Hebei,China;Key Laboratory for Geophysical Exploration Technology Center of Uranium Resources,Shyiazhuang 050002,Hebei,China)

机构地区：[1]核工业航测遥感中心,河北石家庄050002 [2]铀资源地球物理勘查技术中心重点实验室,河北石家庄050002

出　　处：《矿产勘查》2020年第9期1966-1973,共8页Mineral Exploration

基　　金：中国核工业地质局基础地质项目(编号:201915-2)资助。

摘　　要：柴达木盆地北缘具有有利的砂岩型铀矿成矿条件,前人已在北缘发现多个铀矿化点、异常点。由于盆地第四系覆盖广泛且沉积较厚,研究区深部目的层砂体展布特征不明。通过开展柴北缘典型成矿模型CSAMT正演研究,分析了其在低阻背景下探测中阻砂体的有效性;以应用实例分析了研究区深部电阻率异常特征,目的层砂体空间展布,经钻探揭露,发现铀矿化孔1个、异常孔2个,为下一步铀矿勘查工作指明了方向,也验证了该方法的可行和有效性。The North Qaidam has favorable metallogenic conditions of sandstone type uranium deposits,multiple uranium mineralization and abnormal points have been discovered in the Northern.Because the quaternary system of the basin covers a wide range and deposits are relatively thick,the distribution characteristics of sand bodies in the deep target layer of the research area are not clear.Based on the forward modeling of the typical CSAMT metallogenic model of the north margin of qaidam,we analyze the effectiveness of the model in detecting sand bodies under the background of low resistivity.Combined with an application example,the characteristics of resistivity anomaly in the deep part of the study area and the spatial distribution of the sand body are analyzed.One uranium mineralization hole and two abnormal holes were discovered after drilling,which indicated the direction of uranium prospecting and proved the feasibility and effectiveness of the method.

关 键 词：砂岩型铀矿 上干柴沟组 砂体 可控源音频大地电磁法 柴北缘 

分 类 号：P631.3[天文地球—地质矿产勘探]