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

摘要

The Luohe⁃Xiaobaozhuang iron ore district is located in Lujiang County, Anhui Province. The newly discovered Xi⁃aobaozhuang ore deposit is buried at the depth of 1 350~1 800 m, 800~1 000 m under the Luohe main orebody. Before drilling engi⁃neering, 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⁃magnet⁃ic anomalies. The results achieved by the authors can be applied to exploration of the same type of iron deposits.%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1500～1800 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。