从二维电阻率层析成像测量中识别和估算地下各向异性

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Applied Geophysics Pub Date : 2024-09-06 DOI:10.1016/j.jappgeo.2024.105505
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引用次数: 0

摘要

这项研究致力于考察贾坎德邦加特希拉辛格布姆剪切带附近片岩丰富的地区。目的是探测浅层和深层的剪切、断裂和高度叶理化的片岩。电阻率层析成像(ERT)测量采用了 2 × 21 个电极的配置,九个剖面的电极间距从 3 米到 10 米不等,采用了最近开发的名为 "各向异性直流电阻率正演和反演(ADCFI)"的软件,对采集的数据进行二维各向同性和各向异性反演。沿剖面的二维解释剖面显示,在其交汇处的电阻率值是不连续的。此外,电阻率值不规则的区域显示各向异性系数超过了统一值,表明这些特定区域存在明显的各向异性。在加特希拉进行的二维各向异性反演结果显示,深度超过 20 米的区域存在明显的各向异性系数。该深度与含有黄铜矿的地层相关,表明该区域存在火山成因的分层沉积。此外,在浅钻孔深度存在片岩也是观测到各向异性倾向的原因之一。值得注意的是,与各向异性剖面相比,各向同性剖面的各向异性区域显示出更厚的岩层。从加特希拉片岩丰富的地区得出的各向异性系数值约为 2.00。这种巨大的各向异性归因于主要岩石类型(即片岩)固有的褶皱和片岩性。
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Identification and estimation of the subsurface anisotropy from the 2D electrical resistivity tomography surveys

This research was dedicated to examining regions rich in schist rock near the Singhbhum shear zone in Ghatshila, Jharkhand. The aim was to detect schist rocks that were sheared, fractured, and highly foliated in both shallow and deeper layers. Electrical resistivity tomography (ERT) measurements were conducted using a 2 × 21 electrode configuration, with nine profiles covering inter-electrode spacings ranging from 3 m to 10 m. A recently developed software called Anisotropic DC resistivity Forward and Inverse (ADCFI) was employed to conduct 2D isotropic and anisotropic inversion of the collected data. The 2D interpreted sections along the profiles indicated non-continuous resistivity values at their intersections. Furthermore, areas demonstrating irregular resistivity values showcased anisotropy coefficients exceeding unity, indicating significant anisotropy in these particular zones. The irregular resistivity patterns additionally provided further evidence for the existence of substantial anisotropic behavior within the region.

The outcomes of the 2D anisotropic inversion conducted in Ghatshila unveiled significant anisotropy coefficients beyond a depth of 20 m. This depth correlated with the presence of layers containing chalcopyrite, suggesting stratified deposition originating from a volcanogenic setting. Furthermore, the existence of schist rocks in shallow borehole depths contributed to the observed anisotropic tendencies. Notably, regions with heightened anisotropy demonstrated thicker layers in the isotropic section compared to the anisotropic section across all profiles. Anisotropy coefficient values derived from areas abundant in schist rock in Ghatshila were approximately 2.00. This substantial anisotropy was attributed to the inherent foliation and schistosity of the dominant rock type, namely schist.

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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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