利用时域诱导极化数据计算光谱参数用于矿物识别

IF 1.1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Near Surface Geophysics Pub Date : 2023-10-06 DOI:10.1002/nsg.12276
Indresh Kumar, V. Ramesh Babu, B. V. L. Kumar, J. K. Dash, A. K. Chaturvedi
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引用次数: 0

摘要

摘要激电效应在寻找浸染状矿物中得到了广泛的应用。从时域激电数据中计算出的光谱参数在表征来源方面发挥着重要作用,但矿物识别仍然是一个挑战。本文采用Levenberg-Marquardt反演方法从时域IP数据中估计光谱参数,以识别极化源。在合成时域IP数据上测试了该算法对可变噪声水平的鲁棒性。还研究了合成数据在采集时间和各个模型参数方面的模型敏感性分析。对提取参数的误差分析表明,如果松弛时间在采集时间范围内,这些参数可以很好地分解和相关。对于较小的可充电性和频率依赖值,参数仍然存在较差的解析/未解析。该算法还在已知的时域IP数据案例历史上进行了测试,并将估计的光谱参数与已发表的结果进行了比较。从计算得到的谱参数对现场观测到的瞬态电位的推断与其他数据集和井眼信息具有良好的相关性。该方法已经成功地证明了它在从时域IP数据中识别发生在浅层的大型极化源方面的有效性。
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Computation of spectral parameters from time‐domain induced polarization data for mineral identification
Abstract Induced polarization (IP) effect is widely used in the search of disseminated minerals all over the world. Spectral parameters computed from time‐domain IP data play a significant role in characterizing the sources, but mineral identification still remains a challenge. In this paper, the Levenberg–Marquardt method of inversion is adopted in estimating the spectral parameters from time‐domain IP data to identify the polarizable sources. The algorithm is tested on synthetic time‐domain IP data for its robustness to variable noise levels. Model sensitivity analyses on synthetic data were also studied with respect to acquisition time and each individual model parameter. Error analyses on extracted parameters indicated that these are well resolved and correlated if the relaxation time is within the range of acquisition time. The parameters remain poorly resolved/unresolved for smaller values of chargeability and frequency dependence. The algorithm has also been tested over known case histories of time‐domain IP data and compared the estimated spectral parameters with those of published results. The inferences drawn from computed spectral parameters on field‐observed IP transients are in good correlation with other data sets and borehole information. The methodology has successfully shown its usefulness in identifying large polarizable sources occurring at shallow levels from time‐domain IP data.
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来源期刊
Near Surface Geophysics
Near Surface Geophysics 地学-地球化学与地球物理
CiteScore
3.60
自引率
12.50%
发文量
42
审稿时长
6-12 weeks
期刊介绍: Near Surface Geophysics is an international journal for the publication of research and development in geophysics applied to near surface. It places emphasis on geological, hydrogeological, geotechnical, environmental, engineering, mining, archaeological, agricultural and other applications of geophysics as well as physical soil and rock properties. Geophysical and geoscientific case histories with innovative use of geophysical techniques are welcome, which may include improvements on instrumentation, measurements, data acquisition and processing, modelling, inversion, interpretation, project management and multidisciplinary use. The papers should also be understandable to those who use geophysical data but are not necessarily geophysicists.
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