摘要
当前,地震勘探技术在砂岩型铀矿勘查中主要用于查明地层展布、构造和砂体等成矿环境要素,而在分辨地层岩石是否含矿等铀矿信息直接获取方面尚存在欠缺。砂岩型铀矿含矿砂体与围岩的弹性参数差异是开展含矿砂体地震识别技术研究的基础,针对松辽盆地海力锦铀矿床的含矿地层,采集三口钻井的岩心,在实验室采用“线切割+全程样品防护”方式制获岩心样品,通过“量积法+超声脉冲透射法”开展测量,获取钻井岩心样品的纵波速度、横波速度和密度等弹性参数,并计算钻井岩心的纵波阻抗和横波阻抗,在此基础上开展海力锦铀矿床含矿地层岩石的弹性参数特征研究。研究结果表明:在含矿层深度范围内,岩石弹性参数差异主要受岩石岩性影响,而受深度变化的影响可忽略不计;地层岩石不同岩性的速度、密度和波阻抗等弹性参数存在差异,特别是含矿中砂岩的密度和速度参数与围岩存在一定差异,可根据密度和纵波速度差异识别含矿中砂岩,并给出相应的技术方案,为开展岩石岩性及含矿砂体的地震精细识别研究提供依据。
Currently,seismic exploration technology is mainly used to identify ore-forming conditions such as stratigraphic distribution,structure,and sand body of sandstone type uranium deposits,less attention paid to the direct discrimination of mineralized or sterile rocks.The study on elastic parameters differences between ore hosting sand bodies and wall rocks is the basis for seismic technology to identify the ore hosting sand bodies.this paper focused on the ore hosting layer of the Hailijin uranium deposit in the Songliao basin,collected core samples from three borehole,fabricated the samples in the laboratory using the“wire cutting+full process sample protection”method,measured the elastic parameters such as P wave velocity,S wave velocity,and density with the method of“product measurement+ultrasonic pulse transmission”,and calculated the P wave impedance and P wave impedance.The results indicated that within the depth range of the ore bearing layer,the difference in rock elastic parameters was mainly determined by the rock properties,the influence of depth changes can be ignored.There were differences in elastic parameters such as velocity,density,and wave impedance among different rock types,especially the density and velocity parameters of sandstone in ore hosting layer,which differed from those of wall rocks.Sandstone in ore hosting layer can be identified based on the differences of density and P wave velocity,which provides a theoretic basis for seismic identification technical solutions between wall rocks and ore hosting sand bodies.
作者
李子伟
李继木
臧亚辉
程纪星
曹成寅
黄昱丞
LI Ziwei;LI Jimu;ZANG Yahui;CHENG Jixing;CAO Chengyin;HUANG Yucheng(National Key Laboratory of Uranium Resources Exploration-Mining and Nuclear Remote Sensing,Beijing 100029,China;Beijing Research Institute of Uranium Geology,Beijing 100029,China;CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology,Beijing 100029,China;Geologic Part No.243,CNNC,Chifeng 024000,China)
出处
《世界核地质科学》
CAS
2024年第5期957-968,共12页
World Nuclear Geoscience
关键词
松辽盆地
海力锦铀矿床
钻井岩心
弹性参数
含矿砂岩
地震勘探
Songliao basin
Hailijin uranium deposit
drilling core
elastic parameters
mineral bearing sand body
seismic exploration
