| 孙石达.磁总场梯度数据三维反演方法及应用[J].地质与勘探,2015,51(6):1016-1024 |
| 磁总场梯度数据三维反演方法及应用 |
| 3D inversion of gradients of total field magnetic anomalies and its application |
| 投稿时间：2015-03-28 修订日期：2015-07-09 |
| DOI： |
| 中文关键词: 磁总场梯度 磁化率 最小模型结构反演 对数障碍法 |
| 英文关键词: Magnetic total-field gradients, susceptibility, minimum structure inversion, logarithmic barrier method |
| 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: |
| 磁总场三方位梯度数据相对于总场数据包含更丰富的异常信息，将梯度数据应用于三维磁化率反演中，可以更准确地描述异常体。本文采用最小模型结构反演方法进行三维磁化率反演成像，并采用对数障碍法对磁化率的反演取值范围进行约束。通过模型试验，对磁总场异常数据及其三轴梯度数据进行单独反演、联合反演，结果表明三轴梯度联合反演结果可以更好地刻画异常体形态，更有效地分辨邻近异常体，反演物性更合乎实际。将此反演技术应用于大冶铁矿高精度航磁数据反演解释，取得了较好的应用效果。 |
| 英文摘要: |
| The 3-direction gradients of total-field magnetic anomalies (ΔT) contain more information compared with ΔT. Applying such data to 3D inversion of susceptibility allows us to describe anomaly bodies more accurately. This work employs the minimum-structure inversion method to conduct such inversion and uses the logarithmic barrier method to constrain the susceptibility limits. We compare the recovered models from inverting data ΔT, their gradients independently and jointly, separately. The results indicate that the inversion gradients, especially by the joint inversion, are capable of distinguishing nearby sources and can describe the sources more completely and exactly, and the inverted physical properties are closer to the true ones. And we apply this method to the aeromagnetic data acquired in Daye for inversion and interpretation, and obtain good results. |
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