深部金属矿地震数据处理关键技术研究——以内蒙古查干花钼矿区为例  

Key techniques for seismic data processing of deep metal deposits:A case study of the Chaganhua molybdenum orefield in Inner Mongolia

作　　者：岳航羽 王小江[2,3] 王磊 陈孝强 姜春香 李培[2,3] 张保卫 YUE Hang-Yu;WANG Xiao-Jiang;WANG Lei;CHEN Xiao-Qiang;JIANG Chun-Xiang;LI Pei;ZHANG Bao-Wei(Center for Geophysical Survey,China Geological Survey,Langfang 065000,China;Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang 065000,China;National Center for Geological Exploration Technology,Langfang 065000,China;School of Geophysics and Information Technology,China University of Geosciences(Beijing),Beijing 100083,China;Liaoning Institute of Geology and Mineral Resources Co.,Ltd.,Shenyang 110032,China)

机构地区：[1]中国地质调查局地球物理调查中心,河北廊坊065000 [2]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000 [3]国家现代地质勘查工程技术研究中心,河北廊坊065000 [4]中国地质大学(北京)地球物理与信息技术学院,北京100083 [5]辽宁省地质矿产研究院有限责任公司,辽宁沈阳110032

出　　处：《物探与化探》2022年第6期1315-1326,共12页Geophysical and Geochemical Exploration

基　　金：国家重点研发计划项目(2018YFF01013500);中国地质调查局地质调查项目(DD20208001、DD20208002);物化探所中央级公益性科研院所基本科研业务费专项资金资助项目(AS2020Y02)。

摘　　要：深部金属矿常常是多种不同尺度的非均匀地质体共生,加之矿区多处于地质构造复杂、断层较发育、岩性变化剧烈地区,地表条件和表层结构复杂,造成金属矿地震数据往往是复杂多变、多种波相互干涉的地震波场,信噪比极低,严重制约了金属矿地震解释和隐伏矿体预测。本文以内蒙古查干花钼矿区二维地震数据为例,开展深部金属矿地震数据处理关键技术研究,通过分析研究区内金属矿地震数据的特点,归纳总结金属矿地震数据处理的难点,制定一套针对查干花钼矿区的地震数据处理流程。实际处理效果与地质钻孔剖面上已知的矿体分布吻合较好,矿体较厚区域产生的反射波能量较强,薄层矿体产生的反射波振幅较弱,并支撑了区内地质构造的推断及隐伏矿体的圈定。Deep metal deposits tend to be associated with heterogeneous geological bodies on different scales.Moreover,their orefields mostly lie in areas with complex geological structures,developed faults,and intense lithological changes and have complex surface conditions and structures.As a result,the seismic data of metal deposits frequently originate from complex and variable seismic wave fields suffering the mutual inference of multiple types of waves.Therefore,the seismic data have extremely low signal-to-noise ratios,which severely restricts the seismic interpretation of metal deposits and the prediction of concealed orebodies.With the 2D seismic data of the Chaganhua molybdenum orefield in Inner Mongolia as a case study,this study explored the key techniques for the seismic data processing of deep metal deposits.Specifically,this study analyzed the characteristic of seismic data of the Chaganhua molybdenum deposit and summarized the difficulties with seismic data processing of the metal deposit.Based on these,this study developed a set of processes for the data processing of the Chaganhua molybdenum orefield.The actual processing results agree well with the known orebody distribution in the geological borehole section.To be specific,zones with thick ore bodies generated strong reflected energy,while thinner ore bodies exhibited low-amplitude reflected waves.The results of this study can provide strong support for inferring geological structures and delineating concealed orebodies in the study area.

关 键 词：深部金属矿 地震数据处理 关键技术 查干花钼矿区 

分 类 号：P631.4[天文地球—地质矿产勘探]