南岭地区多金属矿NLSD-2孔综合地球物理测井研究  

Integrated Geophysical Logging Study on the Borehole NLSD-2 of the Polymetallic Ore in the Nanling District

作　　者：周新鹏[1] 项彪[2] 邹长春[2] 李建国[1] 赵斌[1] 肖昆[2] 刘东明[2] 侯颉[2] 孙少伟[1] 汪振斌 黄波[1] 尹道谨 

机构地区：[1]山西省地球物理化学勘查院,山西运城044004 [2]地下信息探测技术与仪器教育部重点实验室,中国地质大学(北京),北京100083

出　　处：《地质学报》2014年第4期686-694,共9页Acta Geologica Sinica

基　　金：国家“深部探测技术与实验研究专项(SinoProbe)”第3项目“深部矿产资源立体探测技术及实验研究”第03课题(SinoProbe-0303);中央高校基本科研业务费(2652012096、2652011189)联合资助的成果

摘　　要：NLSD-2孔是在南岭东段于都赣县矿集区盘古山示范区部署的南岭地区第二口科学钻孔———金属异常验证孔,终孔深度2012.12m,全井段实施了连续取芯和综合地球物理测井作业,测井项目包括自然电位、自然伽马、电阻率、声波速度、密度、井径、井斜、井温、超声波成像、极化率、磁化率和井中三分量磁测等,原位获取了钻孔剖面的各种物理化学参数、钻孔几何形态及井壁图像。综合利用各种测井资料,并结合岩芯编录资料,对全井段岩性、金属矿化带和断裂破碎带进行了细致分析。结果表明,自然伽马、声波速度和密度测井对该钻孔的岩性响应明显,通过制作岩性识别交会图,可识别出钻孔剖面的主要岩性;该钻孔的多金属矿化主要有白钨矿化、黑钨矿化、黄铁矿化、闪锌矿化、辉钼矿化等,在测井图中表现为高极化率、低电阻率、磁异常垂直分量ΔZ及水平分量模差ΔH’异常的组合特征,据此能够有效地划分和评价矿化带;断裂破碎带的测井响应特征为井径扩大,电阻率、声波速度、密度减小,超声成像呈暗色条带,这些特征可作为找矿辅助标志。实践证明综合测井资料在深部找矿方面能够发挥重要的作用。The borehole of NLSD-2 is the second scientific drilling hole in the Nanling district,which is disposed by Pangushan demonstration area of Yudu-Ganxian ore district in the eastern of Nanling-verified as a metal exception hole.The whole well （the final depth is 2012.12 m）is implemented a continuous coring and well logging works,and the various physical and chemical parameters of drilling profile,borehole geometry and the images of well wall are achieved by in-situ.The logging projects include：spontaneous potential,natural gamma ray, resistivity, acoustic velocity, density, caliper, inclination, well temperature,ultrasonic imaging,polarization,magnetic susceptibility,borehole three-component magnetic survey logging et al. Combined with the core catalog information, the lithology, polymetallic mineralization belt and fracture zone of the whole well are carefully analysised by using the conventinal logging data The results show that,in the hole NLSD-2 ,the natural gamma ray,acoustic velocity and density logs which have obvious response,can be used to plot the lithology identification crossplot to identify the main lithology of borehole section.In this hole,the polymetallic mineralizations which mainly include scheelite mineralization,wolframite mineralization,pyritemineralization,sphaleritemineralization, molybdenite mineralization and so on,show the combination characteristics of high polarization,low resistivity,the vertical component （ΔZ）and the horizontal component （ΔH’）of magnetic anomaly in the loging figures.And based on these characteristics,the mineralized zone can be effectively divided and evaluated.The log response characteristics of farcture zone are expending caliper,low resistivity,low acoustic velocity and low density,and dark stripe in ultrasound imaging logs.And these features can be used to as an auxiliary flag in the ore prospecting.Therefore,the integrated logging data play an important role in the deep ore prospecting.

关 键 词：南岭 多金属矿 NLSD-2孔 地球物理测井 综合研究 

分 类 号：P618.2[天文地球—矿床学] P631.81[天文地球—地质学]