基线拟合-差值法在砂岩型铀矿自然电位测井曲线校正中的应用——以二连盆地桑根达来地区为例  

Application of Baseline Fitting-Difference Method in Spontaneous Potential Logging Curves Correction of Sandstone Type Uranium Deposit:A Case Study in Sangendalai Area, Erlian Basin

作　　者：王伟 王贵 剡鹏兵 武正乾 李华明 史贵兵 李颖 WANG Wei;WANG Gui;YAN Pengbing;WU Zhengqian;LI Huaming;SHI Guibing;LI Ying(Research Institute No.203,CNNC,Xi'an,Shaanxi 710086,China;Geological Party No.208,CNNC,Baotou,Inner Mongolia 014010,China;School of Earth Sciences,East China University of Technology,Nanchang,Jiangxi 330013,China)

机构地区：[1]核工业二〇三研究所,陕西西安710086 [2]核工业二〇八大队,内蒙古包头014010 [3]东华理工大学地球科学学院,江西南昌330013

出　　处：《铀矿地质》2023年第1期133-142,共10页Uranium Geology

基　　金：中国核工业地勘基金项目“鄂尔多斯盆地南部旬邑-盐池地区铀矿资源评价与勘查”(编号:2022-17);“鄂尔多斯盆地北部鄂托克前旗-东胜地区铀矿资源评价与勘查”(编号:2022-01);“铀矿测井资料处理解释一体化网络平台研发”(编号:2022-15-3)联合资助。

摘　　要：自然电位测井曲线广泛应用在砂岩型铀矿地质工作中,近年在二连盆地桑根达来地区的自然电位测井曲线效果不理想。为了更好地发挥其作用,文章阐明了自然电位的形成机制并分析了自然电位的影响因素,探讨了在测井过程中发现的问题,尤其是自然电位曲线受干扰的原因,如地面电极环材质和探管结构及其解决方法。结合砂岩型铀矿地球物理测井曲线实例及前人研究成果,通过测井曲线形态特点,提出了多次测量和基线拟合-差值方法校正自然电位曲线的方法。经验证文中所提出的措施和方法较好地解决了自然电位测量过程中的环境干扰和基线漂移问题,对砂岩型铀矿地球物理测井工作具有参考意义。Spontaneous potential logging curves are widely used in the exploration of sandstone type uranium deposit. However, the spontaneous potential logging curves in Sangendalai area of Erlian Basin were not satisfactory in recent years. This paper discussed the formation mechanism of spontaneous potential and the influencing factors of natural potential, and the problems in the logging process, especially the interference to spontaneous potential curve such as ground electrode ring material and probe tube structure. By combining the geophysical logging curves of sandstone type uranium ore with previous research results,we proposed the methods of multiple measurements,filtering by linear smoothing algorithm and correction of natural potential curves by baseline fitting-difference method through the morphological characteristics of logging curves and summarized the questions and solutions that should be noted in the spontaneous potential logging work. It was proved that the measures and methods proposed in this paper can solve the problems of environmental interference and baseline drift during spontaneous potential measurement,which are of reference significance for geophysical logging of sandstone uranium deposit.

关 键 词：自然电位测井曲线 影响因素分析 基线拟合-差值校正法 砂岩型铀矿 

分 类 号：P619.14[天文地球—矿床学] P631.3[天文地球—地质学]