| 张骁,许强平.小波多尺度分解罗河—小包庄铁矿床磁异常效果[J].矿产勘查,2022,13(4):460-472 |
| 小波多尺度分解罗河—小包庄铁矿床磁异常效果 |
| Analysis of magnetic anomaly effect of Luohe-Xiaobaozhuang iron deposit based on wavelet multi-scale decomposition method |
| 投稿时间：2021-05-20 |
| DOI：10.20008/j.kckc.202204010 |
| 中文关键词: 磁异常 小波多尺度分解 二阶逼近 六阶细节 罗河—小包庄铁矿床 |
| 英文关键词: magnetic anomaly wavelet multi-scale decomposition second-order approximation sixth-order detail Luohe-Xiaobaozhuang iron deposit |
| 基金项目:本文受安徽省地质勘查基金项目“安徽省庐江县小包庄铁矿床普查”(2008-3-21)资助。 |
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| 中文摘要: |
| 庐江小包庄铁矿床是在庐枞整装勘查区内近期新发现的大型磁铁矿床,主矿体垂直位于已知罗河铁矿床深部。以往对矿区磁异常分离采用延拓、垂向二阶导数等通常方法,导致异常平坦光滑、特征模糊,未能分离深部弱低缓异常,曾得出磁异常为已查明铁矿体引起的这一不准确结论。文章通过设计与罗河铁矿体、小包庄铁矿体磁性规模相当的理论模型,运用小波多尺度分解分离斜磁化及垂直磁化状态下的模型磁异常,并与模型正演结果对比,认为小波多尺度分解能有效分离垂直叠加的磁异常,并且对垂直磁化磁异常分离效果更佳。基于此,对罗河—小包庄铁矿床垂直磁化磁异常进行小波多尺度分解,二阶逼近计算的磁异常基本上可以反映罗河铁矿体(上部铁矿体)引起的异常,六阶细节磁异常基本上可以反映小包庄铁矿体(下部铁矿体)引起的异常,同时六阶细节磁异常显示矿区下部铁矿向东、北仍有较大的延伸,仍具较好找矿远景。 |
| 英文摘要: |
| The Lujiang Xiaobaozhuang iron deposit is a recently discovered large-scale magnetite deposit in the Luzong integrated exploration area and the main ore body is vertically located in the deep part of the known Luohe iron deposit. In the past, the common methods such as extension and vertical second derivative were used to separate magnetic anomalies in mining areas, which resulted in anomalies that were flat and smooth, with fuzzy characteristics, and failed to separate deep weak and slow anomalies. It has been concluded that the magnetic anomaly is caused by the identified iron ore body. Inaccurate conclusion. By designing a theoretical model that is equivalent to the magnetic and scale of Luohe iron ore body and Xiaobaozhuang iron orebody, the paper uses wavelet multi-scale decomposition to separate the model magnetic anomalies in oblique magnetization and perpendicular magnetization and compares with the model forward results. Scale decomposition can effectively separate vertically superimposed magnetic anomalies and has a better separation effect on vertical magnetization magnetic anomalies. Based on this, the wavelet multi-scale decomposition of the vertical magnetization magnetic anomaly of the Luohe-Xiaobaozhuang iron ore deposit, the magnetic anomaly calculated by the second-order approximation can reflect the anomaly caused by the Luohe iron ore body (the upper iron ore body), and the sixth-order detailed magnetic. The anomaly can reflect the anomaly caused by the Xiaobaozhuang iron ore body (the lower iron ore body), and the sixth-order detailed magnetic anomaly shows that the iron ore in the lower part of the mining area still extends to the east and north, and still has a good prospecting prospect. |
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