Combined Electrical Resistivity Tomography (ERT), Direct‐Push Electrical Conductivity (DP‐EC) Logging and Coring – A New Methodological Approach in Geoarchaeological Research

Combined Electrical Resistivity Tomography (ERT), Direct‐Push Electrical Conductivity (DP‐EC) Logging and Coring – A New Methodological Approach in Geoarchaeological Research
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电阻率断层扫描 (ERT)、直推式电导率 (DPâEC) 测井和取芯组合 — 地质考古研究的新方法

DOI:
10.1002/arp.1542
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发表时间:
2016
影响因子:
1.8
通讯作者:
Metallinou
Metallinou
中科院分区:
地球科学4区
文献类型:
--
作者:
Fischer;Wunderlich;Rabbel;Willershäuser;Rigakou;Metallinou

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非侵入性地球物理方法越来越多地应用于地质考古研究,普遍表明需要根据露头或沉积物岩心推断的地层信息进行数据校准。在这一贡献中,提出了一种结合二维(2D)电阻率层析成像(ERT)和基于取心的地层数据以及在地质考古研究中首次采用直推式电导率(DP-EC)测井的方法。这种方法基于对两种不同类型的档案的研究,产生了高分辨率的数据,这两种档案是位于德国中部的霍尔斯特堡遗址和希腊的科孚市遗址,前者位于河流陆地带,后者位于近海地带。结果表明,DP-EC测井高分辨率示踪粒度起伏,反映了沉积条件随时间的变化。此外,在ERT反演过程中加入了DP-EC测井以层界面和电阻率形式的约束,最大限度地减少了反演结果的模糊性。结果表明,在DP-EC测井的基础上结合具有一定起始电阻率的区域要优于单独使用地层界面的优点。结论是,在今后的地质考古和地貌学研究中,应将取心、DP-EC测井和ERT测量相结合,作为对浅层地下进行更全面的地层描述的标准方法。版权所有©2016 John Wiley&Sons,Ltd.
Non‐invasive geophysical methods have been increasingly applied in geoarchaeological research commonly showing the need of data calibration based on stratigraphical information deduced from outcrops or sediment cores. In this contribution, a methodological approach combining two‐dimensional (2D) electrical resistivity tomography (ERT) and stratigraphical data based on coring and, for the first time in geoarchaeological research, direct‐push electrical conductivity (DP‐EC) logging is presented and discussed. The approach yields high resolution data based on studies of two different types of archives, the Holsterburg site in central Germany located in a fluvio‐terrestrial zone and the Corfu City site in Greece located in a near‐coastal zone. It is shown that DP‐EC logs trace fluctuations over grain size in high resolution which reflect changes of depositional conditions in the course of time. In addition, constraints from DP‐EC logs in the form of layer interfaces and electrical resistivities were incorporated into the ERT inversion process minimizing the ambiguity of inversion results. It is shown that incorporating regions with certain starting resistivities based on DP‐EC logs exceed the advantage of using layer interfaces alone. It is concluded that in future geoarchaeological and geomorphological studies a combined application of coring, DP‐EC logging and ERT measurements should be considered as a standard approach towards a more comprehensive stratigraphical characterization of the shallow subsurface. Copyright © 2016 John Wiley & Sons, Ltd.
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