对地动仪生成的自电位数据进行紧凑源反演

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Applied Geophysics Pub Date : 2024-07-22 DOI:10.1016/j.jappgeo.2024.105463
Yijian Luo , Yi-an Cui , Youjun Guo , Jing Xie , Jianxin Liu
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引用次数: 0

摘要

自电位(SP)法是一种经典的地球物理勘探方法,在地下污染物监测等领域有着广泛的应用前景。然而,由于形成机理的复杂性和先验信息的缺乏,自电势源的精确定量反演还存在不少困难,实际应用中多采用定性解释。在这项工作中,我们对地层微生物的 SP 数据进行了反演研究,以精确反演和定位与微生物活动密切相关的 SP 源的空间分布。反演算法中加入了基于电阻率的深度加权矩阵,以促进 SP 源从地表向其原始深度迁移。为了符合 SP 源的实际分布情况,还引入了最小支持稳定函数来施加额外的紧凑约束。首先设计了两个合成模型来验证所提算法的有效性和准确性。在此基础上,通过沙盒实验持续观测和记录典型生物产生的 SP 信号:在此基础上,我们进行了沙盘实验,连续观察和记录典型生物:Shiwanella Oneida MR-1 分解有机物时产生的 SP 信号。然后对观察到的数据进行反演,找出 SP 源。反演结果表明,在腐殖质中加入石湾菌一MR-1后,腐殖质顶部立即出现负SP源,负SP源急剧增加,然后保持稳定,并随着时间的推移缓慢衰减。负 SP 源集中在腐殖质顶部,这与生物地理电池模型的理论分析相一致。
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Compact source inversion of self-potential data generated by geomicrobes

The self-potential (SP) method is a classical geophysical exploration method which has a wide application prospect in underground pollutant monitoring and other fields. However, due to the complexity of the formation mechanism and the lack of prior information, there are still quite a few difficulties in the precise quantitative inversion of the SP sources, and qualitative interpretation is frequently adopted in practical applications. In this work, we carry out inversion research on the SP data of geomicrobes to accurately invert and locate the spatial distribution of the SP sources which is closely relevant to microbial activities. The resistivity-based depth weighting matrix is added to the inversion algorithm to promote the migration of the SP sources from the earth surface to their original depth. And to conform to the actual distribution of the SP sources, the minimum support stabilizing function is introduced to impose additional compact constraint. Two synthetic models are firstly designed to verify the effectiveness and accuracy of the proposed algorithm. On this basis, the sandbox experiment that continuously observes and records the SP signals generated by the typical organism: Shiwanella Oneida MR-1 breaking down the organic matter is carried out. Then the observed data is inverted to locate the SP sources. The inversion results demonstrate that with the addition of Shiwanella Oneida MR-1 into the humus, the negative SP source immediately appear on the top of the humus, which increase sharply, then remain stable and then slowly decay over time. The negative SP sources are concentrated on the top of the humus, which is consistent with the theoretical analysis of the biogeobattery model.

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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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