古地理学报2025，Vol.27Issue(3)：777-784,8.DOI:10.7605/gdlxb.2025.031
基于测井曲线重构和地震波阻抗反演的煤系关键金属矿层精细勘探技术
Fine exploration technology of critical metals in coal measures based on well logging curve reconstruction and seismic impedance inversion
摘要
Abstract
At the bottom of the Upper Permian Longtan coal measures in eastern Yunnan and western Guizhou,there is a Nb-Zr-REY-Ga type cirtical metal ore layer with a cumulative thickness of several me-ters and characterized by natural gamma positive anomalies.By means of seismic work and traditional wave impedance inversion,sandstone and mudstone can be effectively distinguished,but limited by the small difference of wave impedance,the ore layer can not be identified.In order to construct a fine geophysical exploration technology for the ore layer,based on logging and seismic data,this paper takes gallium(Ga)element in the ore layer as an example(gamma value＞2.0 API when the critical industrial grade is 50 μg/g),and uses the information statistical weighting method and the natural gamma data of the ore layer to reconstruct the longitudinal wave velocity curve,so that the calculated wave impedance curve of the ore layer signal is enhanced by about 120％,and the ore layer is constrained within the reconstructed wave impedance value range of＞16 000 g/cm3·m/s,which solves the technical problem of identifying key metal ore layers by using wave impedance curve.On the seismic section inverted by the reconstructed wave impedance data,the boundary of the ore layer is clear and the lateral traceability is good.Through drilling verification,the average error of the thickness of the ore layer predicted by seismic inversion is 17.6％.It shows that the seismic inversion using the reconstructed wave impedance data can effectively identify and track the ore layer,and achieve the purpose of fine detection of the ore layer.This technical method has good application value and prospect for fine exploration of cirtical metal ore layers in coal measures with abnormal logging.关键词
煤系关键金属/测井曲线重构/波阻抗反演/勘探技术/二叠系/滇东-黔西Key words
critical metals of coal measures/logging curve reconstruction/wave impedance inver-sion/exploration technique/Permian/eastern Yunnan and western Guizhou分类
天文与地球科学引用本文复制引用
王雷,祖淯文,邸立伟,杨敏芳,边晓,凌紫玉,邵龙义,鲁静..基于测井曲线重构和地震波阻抗反演的煤系关键金属矿层精细勘探技术[J].古地理学报,2025,27(3):777-784,8.基金项目
国家重点研发计划(编号:2021YFC2902000)、国家自然科学基金项目(编号:42172196、41772161)、柳江盆地地质遗迹保护项目(编号:Z1303002403442001)、中国矿业大学(北京)大学生创新训练项目(编号:202402027)联合资助成果.Co-funded by the National Key Research and Development Program(No.2021YFC2902000),National Natural Science Foundation of China(Nos.42172196,41772161),Liu-jiang Basin Geological Relics Protection Project(No.Z1303002403442001),China University of Mining and Technology(Beijing)College Students'Innovation Training Project(No.202402027) （编号:2021YFC2902000）
