| 郭志馗.航磁异常深部弱信号提取技术研究[J].地质与勘探,2015,51(6):1007-1015 |
| 航磁异常深部弱信号提取技术研究 |
| Extracting weak magnetic signals at depth from aeromagnetic anomaly data |
| 投稿时间：2015-02-09 修订日期：2015-08-08 |
| DOI： |
| 中文关键词: 深部弱信号 向下延拓 匹配滤波 频谱分析 |
| 英文关键词: deep weak signal, downward continuation, matched-filter, spectrum analysis |
| 基金项目:国家“973”计划项目子课题（编号:2012CB416800）和科研院所基本科研资金资助项目（编号:WHS201211）联合资助 |
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| 中文摘要: |
| 磁异常是地下不同深度磁性地质体产生的磁场异常的叠加，在规范高度的航磁测量结果中，深部磁性体所产生的异常通常表现为弱而平缓，其水平与垂向分辨率均较低，很难从航磁资料处理解释中提取出来。因此，需要研究用适当方法提取由深部地质体引起的弱磁信息。本文采用精度高且稳定的位场延拓技术将航磁异常向下延拓，可以增强磁异常幅度，随着延拓面与场源之间距离的减小，浅成磁信号与深成磁信号的视深度差异增大，在对数功率谱上可以将其区分，而后可利用匹配滤波方法将浅部信号剥离，从而得到深部弱信号，同时可计算这些信号的视深度。 |
| 英文摘要: |
| Magnetic anomalies are superposition of magnetic field anomalies of geological bodies at different depths in the subsurface. In aeromagnetic surveys, such signals from depth are generally weak and gentle, with low resolutions in both horizontal and vertical directions. Thus they are difficult to extract from aeromagnetic data processed and interpreted. To solve this problem, this work uses the high-precision and stable downward continuation method to enhance amplitudes of magnetic anomalies. With decreasing distances between the continuation plane and field source, the apparent depth difference between shallow and deep magnetic signals increases progressively. So they can be distinguished on the logarithm power spectrum. Then the shallow signals are removed by the matched filter to isolate the deep signals. Meanwhile the apparent depths of these deep signals can be calculated. |
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