Architecture and temporal variations of a terrestrial CO2 degassing site using electric resistivity tomography and self-potential

Architecture and temporal variations of a terrestrial CO2 degassing site using electric resistivity tomography and self-potential
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使用电阻率断层扫描和自电位研究陆地二氧化碳脱气场的结构和时间变化

DOI:
10.1007/s00531-017-1470-0
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发表时间:
2017
影响因子:
2.3
通讯作者:
Kämpf
Kämpf
中科院分区:
地球科学3区
文献类型:
--
作者:
Nickschick;Flechsig;Meinel;Mrlina;Kämpf

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捷克共和国波希米亚西北部的Hartoušov mofette气田具有岩石圈地幔强烈的CO2脱气作用。在使用电阻率层析成像的测试调查中,我们观察到随着时间的推移在地下结构的变化下重CO2脱气点深度约40米,并将其与CO2气体通量和土壤气体映射从以前的研究。电阻率的变化是在2012年9月至2013年10月期间以不规则的间隔测量的,突出了CO2脱气最强(56 × 103 g m− 2天−1)的电阻率分布的巨大变化,表明流体引起的底层粘土质沉积物性质的变化。在平行于Erts的自电位中,可以发现正异常和负异常,其中发生CO2脱气,这表明这些点内的流体的不同上升或下降。随着时间的推移,一些脱气点似乎并没有持续活跃地脱气,这也可以在同一地区的其他研究中观察到。我们建议,未来的气体映射伴随着观察流体系统的状态在地下随着时间的推移,例如电阻率层析成像和自电位的方法。
The Hartoušov mofette field in NW Bohemia, Czech Republic, is characterized by strong CO2degassing from the Lithospheric Mantle. In a test survey using electrical resistivity tomography, we observed changes over time in the subsurface structure beneath heavily CO2degassing spots to depths of about 40 m and compared them to CO2gas flux and soil gas mappings from previous studies. Changes in the electrical resistivity were measured between September 2012 and October 2013 at irregular intervals and highlight large variations in the resistivity distribution where the CO2degassing was strongest (56 × 103 g m−2day−1), indicating a fluid-induced change of properties of the underlying clayey sediments. Positive and negative anomalies in the electric self-potential parallel to the ERTs can be found where CO2degassing occurs which indicates varying ascent or descent of fluids within these spots. Some degassing spots seem not to be actively degassing continuously over time, which can also be observed by other studies in the same area. We suggest that future gas mappings are accompanied by methods that observe the state of fluid systems at subsurface over time, e.g. electric resistivity tomography and self potential.
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