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Three-dimensional electromagnetic modeling of the Trans-European Suture Zone (EMTESZ 3-D)

跨欧洲缝合带的三维电磁建模 (EMTESZ 3-D)

基本信息

批准号：
217550540
负责人：
Dr. Heinrich Brasse
金额：
--
依托单位：
Fachrichtung Geophysik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2013-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/217550540?language=en
关键词：
Three dimensional electromagnetic modeling Trans

项目摘要

During the EMTESZ project (Electromagnetic Study of the Trans-European Suture Zone) several magnetotelluric (MT) transects across the Northeast German and the Polish Basin were realized. They were interpreted in a two-dimensional (2-D) manner, and this is certainly justified for most of the data in the NE German – S Swedish part of the study area. In the central part of the Polish Basin, however, a clear indication for three-dimensionality, mainly from induction vectors exists: real vectors at long periods point predominantly perpendicular to the profiles. Thus 2-D modeling can only be regarded as a first step in interpretation, which may even yield a false image of conductivity structures at depth. In the meanwhile, 3-D inversion codes have become more accessible and computing performance (considering memory and execution time) allows now for more realistic model geometries. It is thus an objective of this proposal to apply such – freely available – codes to the data set, particularly to the inverted basin area of the Czaplinek block and salt dome. We expect to get a clearer image of the highly conductive zone – interpreted as an alum shale layer – in the basin, and particularly of the good conductor in the uppermost mantle. 3-D conductance studies will complement this approach. The 3-D inversion will principally be carried out by our Polish project partners with close interaction/guidance from our side and in cooperation with the Russian partners, who will supply the conductance maps of the entire study area. Keywords: Trans-European Suture Zone, electromagnetics, 3-D conductivity models, 3-D inversion

在EMTESZ项目（跨欧洲缝合带电磁研究）期间，实现了横跨德国东北部和波兰盆地的几个大地电磁（MT）断面。他们被解释在一个二维（2-D）的方式，这当然是合理的东北德国-瑞典的研究区域的一部分的大部分数据。然而，在波兰盆地的中部，主要从感应矢量中可以清楚地看到三维性：长周期的真实的矢量主要垂直于剖面。因此，二维建模只能被视为解释的第一步，这甚至可能产生深度导电性结构的错误图像。与此同时，三维反演代码变得更容易访问，计算性能（考虑内存和执行时间）现在允许更真实的模型几何形状。因此，本提案的一个目的是将这种免费提供的代码应用于数据集，特别是应用于恰普利内克区块和盐丘的倒置盆地区域。我们希望得到一个更清晰的图像的高导电区-解释为明矾页岩层-在盆地中，特别是良好的导体在最上面的地幔。三维电导研究将补充这一方法。三维反演将主要由我们的波兰项目合作伙伴进行，并与俄罗斯合作伙伴密切互动/指导，他们将提供整个研究区域的电导图。关键词：横贯欧洲缝合带，电磁学，三维电导率模型，三维反演