Study of response characteristics of cross-well induced polarization method in anisotropic media

IF 2 3区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Frontiers in Earth Science Pub Date : 2024-08-22 DOI:10.3389/feart.2024.1443764

Zhang Junke, Zhou Lei, Wang Xinyu, Xie Xingbing, Mao Yurong, Yan Liangjun

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Abstract

The borehole induced polarization method has been widely used in deep mineral exploration, oil and gas resource exploration, and water resource exploration because of its high efficiency and good exploration effect. At present, the related research on the cross-well induced polarization method assumes that the underground medium is isotropic, but the electrical characteristics of the actual earth medium are anisotropic. To analyze the influence of the anisotropic characteristics on the cross-well induced polarization method, in this paper, the anisotropic forward algorithm of conductivity and polarizability in different principal axis directions based on the finite element method is studied. A three-dimensional forward simulation of the cross-well induced polarization method in anisotropic media is realized. The effectiveness and correctness of the algorithm are verified by testing and comparing complex 3-D isotropic and anisotropic models. Anisotropic geological models of the horizontal plate and inclined plate are constructed to analyze the anisotropic influences of conductivity and polarizability in different principal axis directions on the cross-well induced polarization response. The results show that the emitter sources with different depths in the well have different influences on the electrical response of the plates. Anisotropic conductivity and polarizability in horizontal plates exhibit most pronounced characteristics in the x-direction, significantly influencing the apparent polarizability curves. However, when the resistivity and polarizability are both anisotropic, the change in the z-direction is the most complicated. When the plate is inclined, the amplitude of the electrical response curve decreases to a certain extent, and the position where the amplitude appears shifts to different degrees. Notably, the response curves of the y-direction anisotropy are basically consistent with the response curves of the isotropy, regardless of the anisotropy of the conductivity and polarizability or anomalous body tilts. The results of this study improve our understanding of the influence of anisotropy on cross-well induced polarization and provide theoretical support for the interpretation of cross-well induced polarization data considering anisotropy.

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研究各向异性介质中交叉井诱导偏振法的响应特性

钻孔诱导极化法因其效率高、勘探效果好而被广泛应用于深部矿产勘探、油气资源勘探和水资源勘探等领域。目前，关于跨井诱导极化法的相关研究都假定地下介质是各向同性的，但实际地球介质的电特性却是各向异性的。为了分析各向异性特征对跨井诱导极化方法的影响，本文研究了基于有限元法的不同主轴方向电导率和极化率的各向异性正演算法。实现了各向异性介质中交叉井诱导偏振法的三维正演模拟。通过测试和比较复杂的三维各向同性和各向异性模型，验证了算法的有效性和正确性。建立了水平板和倾斜板的各向异性地质模型，分析了不同主轴方向的电导率和极化率对跨井诱导极化响应的各向异性影响。结果表明，井中不同深度的发射源对平板的电响应有不同的影响。水平板的各向异性电导率和极化率在 x 轴方向表现出最明显的特征，极大地影响了表观极化率曲线。然而，当电阻率和极化率均为各向异性时，z 方向的变化最为复杂。当平板倾斜时，电响应曲线的振幅会在一定程度上减小，振幅出现的位置也会发生不同程度的移动。值得注意的是，y 方向各向异性的响应曲线与各向同性的响应曲线基本一致，与电导率和极化率的各向异性或异常体倾斜无关。该研究结果加深了我们对各向异性对跨井诱导偏振影响的理解，为考虑各向异性的跨井诱导偏振数据解释提供了理论支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Frontiers in Earth Science Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

3.50

自引率

10.30%

发文量

2076

审稿时长

12 weeks

期刊介绍： Frontiers in Earth Science is an open-access journal that aims to bring together and publish on a single platform the best research dedicated to our planet. This platform hosts the rapidly growing and continuously expanding domains in Earth Science, involving the lithosphere (including the geosciences spectrum), the hydrosphere (including marine geosciences and hydrology, complementing the existing Frontiers journal on Marine Science) and the atmosphere (including meteorology and climatology). As such, Frontiers in Earth Science focuses on the countless processes operating within and among the major spheres constituting our planet. In turn, the understanding of these processes provides the theoretical background to better use the available resources and to face the major environmental challenges (including earthquakes, tsunamis, eruptions, floods, landslides, climate changes, extreme meteorological events): this is where interdependent processes meet, requiring a holistic view to better live on and with our planet. The journal welcomes outstanding contributions in any domain of Earth Science. The open-access model developed by Frontiers offers a fast, efficient, timely and dynamic alternative to traditional publication formats. The journal has 20 specialty sections at the first tier, each acting as an independent journal with a full editorial board. The traditional peer-review process is adapted to guarantee fairness and efficiency using a thorough paperless process, with real-time author-reviewer-editor interactions, collaborative reviewer mandates to maximize quality, and reviewer disclosure after article acceptance. While maintaining a rigorous peer-review, this system allows for a process whereby accepted articles are published online on average 90 days after submission. General Commentary articles as well as Book Reviews in Frontiers in Earth Science are only accepted upon invitation.