Advancements of induced polarisation theory in sediments

沉积物激发极化理论的进展

• 批准号: 248351078
• 负责人: Professor Dr. Andreas Hördt
• 金额: --
• 依托单位: Institut für Geophysik und Extraterrestrische Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/248351078?language=en
• 关键词: Advancements; induced; polarisation; theory; sediments

The estimation of hydraulic parameters with geophysical methods is a research area of fundamental importance, e.g. for groundwater exploration and management, for geothermal energy, and for environmental problems. Spectral induced polarization is a promising method that measures the frequency dependent electrical conductivity of the subsurface. In principle, hydraulic parameters may be estimated from electrical conductivity through empirical relationships derived in the laboratory. The empirical relationships, however, often depend on the material and lack general applicability, or they have large error margins. Within this project, we investigate the theoretical foundations of the relationships between electric and hydraulic properties of porous media. During the course of the ongoing project, an existing semi-analytical model that describes the impedance of a cylindrical pore system was extended into an impedance network. The extension allows to incorporate measurable petrophysical parameters, such as porosity, specific internal surface, or pore radii distribution, into the model. We succeeded to simulate several characteristic properties of measured laboratory data, including features that cannot be explained with conventional approaches. Within the proposed prolongation, we will further improve the model by modifying some of the chosen parameterizations, with the aim to quantitatively fit measured impedance spectra. We also will extend the comparison with measured data to larger data sets in order to test hypotheses resulting from the theory.

利用地球物理方法估算水力参数是地下水勘探和管理、地热能和环境问题等方面具有重要基础意义的研究领域。光谱诱导极化是一种很有前途的方法，可以测量地下与频率相关的电导率。原则上，水力参数可以通过实验室推导的经验关系从电导率估计出来。然而，经验关系往往取决于材料，缺乏普遍适用性，或者它们有很大的误差范围。在这个项目中，我们研究了多孔介质的电和水力特性之间关系的理论基础。在正在进行的项目过程中，将描述柱状孔隙系统阻抗的现有半解析模型扩展为阻抗网络。该扩展允许将可测量的岩石物理参数（如孔隙度、特定内表面或孔隙半径分布）纳入模型。我们成功地模拟了测量实验室数据的几个特征属性，包括传统方法无法解释的特征。在提出的延长时间内，我们将通过修改一些选择的参数化来进一步改进模型，目的是定量拟合测量的阻抗谱。我们还将与测量数据的比较扩展到更大的数据集，以检验由理论产生的假设。

项目成果

Temperature dependence of spectral induced polarization data: experimental results and membrane polarization theory

光谱激发偏振数据的温度依赖性：实验结果和膜偏振理论

• DOI: 10.1093/gji/ggw027
• 发表时间: 2016
• 期刊: Geophysical Journal International
• 影响因子: 2.8
• 作者: Bairlein;Bücker;Hördt;Nordsiek
• 通讯作者: Nordsiek

Simulation of membrane polarization of porous media with impedance networks

用阻抗网络模拟多孔介质的膜极化

• DOI: 10.3997/1873-0604.2017054
• 发表时间: 2017
• 期刊: Near Surface Geophysics
• 影响因子: 1.6
• 作者: Stebner;Halisch;Hördt
• 通讯作者: Hördt

Spectral induced polarization of low-pH cement and concrete

• DOI: 10.1016/j.cemconcomp.2019.103397
• 发表时间: 2019-11
• 期刊: Cement and Concrete Composites
• 影响因子: 10.5
• 作者: P. Leroy;A. Hördt;S. Gaboreau;E. Zimmermann;F. Claret;M. Bücker;Hermann Stebner;J. Huisman

The dependence of induced polarization on fluid salinity and pH, studied with an extended model of membrane polarization

• DOI: 10.1016/j.jappgeo.2016.02.007
• 发表时间: 2016-12
• 期刊: Journal of Applied Geophysics
• 影响因子: 2
• 作者: A. Hördt;K. Bairlein;Anja Bielefeld;M. Bücker;E. Kuhn;S. Nordsiek;Hermann Stebner

Geometrical constraints for membrane polarization

膜极化的几何约束

• DOI: 10.3997/1873-0604.2017053
• 发表时间: 2017
• 期刊: Near Surface Geophysics
• 影响因子: 1.6
• 作者: Hördt;Bairlein;Bücker;Stebner
• 通讯作者: Stebner