小波变换在磁异常分离中的应用——以安徽庐枞矿集区小包庄铁矿床为例
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摘要
安徽庐枞小包庄铁矿床主矿体位于已知罗河大型铁矿床正下方,埋藏深度达1 500~1 800 m。应用磁异常指导钻探工程布置,需对罗河(上部)铁矿与小包庄(下部)铁矿引起的磁异常进行分离。通过小波变换多尺度分析方法,较好地分离、提取了深部小包庄铁矿引起的低缓异常,其六阶细节异常指导找矿工程布置,见矿效果较好,从而快速、高效发现了一大型磁铁矿床。实践表明,该方法对于分离深埋藏、具垂向叠加铁矿床磁异常是有效的,可推广应用于同类型铁矿床的找矿勘探工作。
The Luohe-Xiaobaozhuang iron ore district is located in Lujiang County,Anhui Province.The newly discovered Xiaobaozhuang ore deposit is buried at the depth of 1 350 ~ 1 800 m,800 ~ 1 000 m under the Luohe main orebody.Before drilling engineering,it is necessary to separate Luohe magnetic anomaly in the upper part and Xiaobaozhuang magnetic anomaly in the lower part.Through the wavelet multi-scale transform,Xiaobaozhuang magnetic anomaly at the depth was separated and extracted perfectly.The large-size orebody predicted by six-step detailed anomaly was used to guide drilling exploration.The wavelet multi-scale transform can decompose gravity and magnetic anomalies in space at different scales and can effectively separate vertical superposition gravity-magnetic anomalies.The results achieved by the authors can be applied to exploration of the same type of iron deposits.
The Luohe-Xiaobaozhuang iron ore district is located in Lujiang County,Anhui Province.The newly discovered Xiaobaozhuang ore deposit is buried at the depth of 1 350 ~ 1 800 m,800 ~ 1 000 m under the Luohe main orebody.Before drilling engineering,it is necessary to separate Luohe magnetic anomaly in the upper part and Xiaobaozhuang magnetic anomaly in the lower part.Through the wavelet multi-scale transform,Xiaobaozhuang magnetic anomaly at the depth was separated and extracted perfectly.The large-size orebody predicted by six-step detailed anomaly was used to guide drilling exploration.The wavelet multi-scale transform can decompose gravity and magnetic anomalies in space at different scales and can effectively separate vertical superposition gravity-magnetic anomalies.The results achieved by the authors can be applied to exploration of the same type of iron deposits.
引文
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[3]周涛发,范裕,袁峰,等.安徽庐枞(庐江-枞阳)盆地火山岩的年代学及其意义[J].中国科学:D辑,2008,51(10):1470-1482.
[4]高昌生,张千明,尚世贵,等.安徽庐江小包庄铁矿普查地质报告[R].合肥:安徽省地质矿产勘查局327地质队,2003.
[5]李色篆.岩矿石磁性研究方法及其应用[M].北京:冶金工业出版社,1988.
[6]黄清涛.安徽庐江罗河铁矿.北京:地质出版社,1989:1-193.
[7]侯遵泽,杨文采.小波分析应用研究[J].物探化探计算技术,1995,17(3):1-9.
[8]刘天佑.位场勘探数据处理新方法[M].北京:科学出版社,2007.
[9]刘天佑.磁法勘探软件MAGS2.0手册[M].武汉:中国地质大学,2007.
[10]唐晓初.小波分析及其应用[M].重庆:重庆大学出版社,2006.
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