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3-D parallel inversion of multichannel transient electromagnetic data using a moving footprint
Geophysical Journal International ( IF 2.8 ) Pub Date : 2021-05-10 , DOI: 10.1093/gji/ggab187
Xianxiang Wang 1 , Nongren You 1 , Qingyun Di 2 , Juzhi Deng 1 , Yongbang Chang 1
Affiliation  

SUMMARY The multichannel transient electromagnetic method (MTEM), sensitive to both near-surface and deeply buried geoelectric structures, is a useful geophysical tool to map resistive targets. A typical MTEM survey consists of a large number of receiver and transmitter positions. The produced data volume is much larger than a traditional transient electromagnetic method survey, posing computational difficulties for its data inversion and interpretation. We proposed a 3-D parallel inversion algorithm for MTEM data based on nonlinear conjugate gradient method and the moving footprint technique. The electromagnetic response and Fréchet derivative are first calculated in the frequency domain with integral equation method and then cosine transformed into time domain. We not only fully parallelize the forward modelling and Fréchet derivative calculation but also use a moving footprint to speed up the inversion. The footprints for different offsets are carefully evaluated through synthetic models. The effectiveness of the developed algorithm has been demonstrated through synthetic and case studies.

中文翻译:

使用移动足迹对多通道瞬态电磁数据进行 3-D 并行反演

总结 多通道瞬态电磁法 (MTEM) 对近地表和深埋地电结构都敏感,是绘制电阻目标图的有用地球物理工具。典型的 MTEM 测量包括大量的接收器和发射器位置。产生的数据量远大于传统的瞬态电磁法测量,对其数据反演和解释带来了计算困难。我们提出了一种基于非线性共轭梯度法和移动足迹技术的MTEM数据3-D并行反演算法。首先用积分方程法在频域计算电磁响应和Fréchet导数,然后将余弦变换到时域。我们不仅完全并行化了正向建模和 Fréchet 导数计算,而且还使用移动足迹来加速反演。通过合成模型仔细评估不同偏移量的足迹。通过综合和案例研究证明了所开发算法的有效性。
更新日期:2021-05-10
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