Weighted Laterally-constrained inversion of frequency-domain airborne EM data
Weighted Laterally-constrained inversion of frequency-domain airborne EM data
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发表时间：
2014
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通讯作者：
Cai Jin
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作者：
Cai Jin
传统的一维反演方法已广泛应用于航空电磁资料的处理和解释中，但对于复杂的地下结构，单测站反演有时会出现一些问题，如相邻测站反演的大地参数变化剧烈，反演的层间界面横向不连续性强等。考虑到航空电磁系统具有很高的空间采样率，针对相邻台站下的地下构造应具有一定程度的连续性，本文提出了侧向约束反演（LCI），并通过对各反演参数增加不同的权值进行了改进，首先讨论了AEM正演模型和侧向约束反演算法，重点讨论了其理论和反演技术，通过对合成数据和实测数据的反演，并与其它常规反演方法的反演结果进行比较，验证了该方法的有效性。
Traditional 1Dinversions have been widely used in the airborne EM data processing and interpretation.However,the inversion at a single survey station for the complex underground structure can sometimes be problematic.Some serious problems may occur,such as the inverted earth parameters at neighbor stations change sharply,the inverted layer interfaces have strong lateral discontinuities.Taking into account the fact that airborne EM systems have very high spatial sampling,while the underground structures under the neighbor stations should be continuous to some extent,we put forward in this paper the laterally-constrained inversion(LCI)and make further improvements by adding different weights to each inversion parameter.We first discuss the AEM forward modeling and WLCI algorithm,focusing on the theory and inversion techniques, followed by how to apply it for the frequency-domain AEM inversions.We check the effectiveness of the technique by implementing it to both synthetic and survey data and comparing the results with those from other conventional inversions.