Article
Geochemistry & Geophysics
Oluwaseun S. Ogungbemi, John O. Amigun, Gbenga M. Olayanju, Ganiyu Olabode Badmus
Summary: Integrated airborne and ground geophysical studies were conducted in parts of Ilesha schist belt in southwestern Nigeria to provide a guide for mineral prospecting, narrowing down the search for mineral deposits. Aeromagnetic and aero-radiometric data were analyzed to enhance shallow and deep geologic features, mapping spatial lithologic changes and exploring subsurface heterogeneity. The methodology proved effective in highlighting areas with relevant lithostructural signatures and potential for mineral deposition, providing insight for future exploration works and target selection.
INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION
(2021)
Article
Environmental Sciences
Tao Chen, Dikun Yang
Summary: The study focuses on the systematic errors in airborne and semi-airborne transient electromagnetic surveys caused by the inexact geometry of transmitter and receiver, proposing a universal approach for modeling arbitrarily complex geometries. Simulations show that considering tilt can provide more accurate estimates of near-surface conductivity in groundwater problems.
Article
Environmental Sciences
Seogi Kang, Rosemary Knight, Meredith Goebel
Summary: This study developed a new approach to image the bedrock surface and the confining Corcoran Clay layer using AEM data in the Central Valley of California. The approach incorporated prior knowledge of the targets and improved imaging through multiple inversions and an interpolation process. The results showed that the AEM data provided reliable information about the bedrock surface and the Corcoran Clay layer.
WATER RESOURCES RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Niels B. Christensen
Summary: In modern hydrogeological investigations, combining different sources of information allows for the construction of dynamic hydraulic models, leading to improved geological interpretations and better resolution of subsurface resistivity structures.
JOURNAL OF APPLIED GEOPHYSICS
(2022)
Article
Geochemistry & Geophysics
Juntao Lu, Xuben Wang, Zhengwei Xu, Michael S. Zhdanov, Ming Guo, Minqiang Teng, Zhen Liu
Summary: This article introduces a quasi-2D inversion scheme to extract resistivity and IP parameters from SATEM data. The proposed scheme utilizes a fast semi-analytical method for Jacobian matrix calculation and employs a staged inversion strategy with lateral constraints, which improves inversion stability and recovers underground resistivity and IP property distributions.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Geochemistry & Geophysics
Yanfu Qi, Xiu Li, Changchun Yin, Huaiyuan Li, Zhipeng Qi, Jianmei Zhou, Yunhe Liu, Xiuyan Ren
Summary: In this article, a 3-D AEM inversion algorithm is developed for a topographic earth model. The algorithm utilizes the time-domain finite-element algorithm based on unstructured mesh and the Gauss-Newton method, improving computational efficiency and effectively considering the influence of topography on AEM inversions.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Geochemistry & Geophysics
Gordon R. J. Cooper
Summary: Source-distance methods can be used to locate the position and depth of potential field sources. By improving the existing analytic signal amplitude-based methods, they can be more flexible in the orders of analytic signal amplitude that they use. This not only enhances their robustness against noise and interference, but also allows the reliability of the results to be assessed by repeating the methods using different orders.
GEOPHYSICAL PROSPECTING
(2023)
Article
Geochemistry & Geophysics
Xintao Chai, Genyang Tang, Kai Lin, Zhe Yan, Hanming Gu, Ronghua Peng, Xiaodong Sun, Wenjun Cao
Summary: Sparse-spike deconvolution (SSD) is a key method for seismic resolution enhancement. Traditional trace-by-trace methods lack spatial continuity and require intensive human-computer interaction, which does not align with the trend of intelligent seismic exploration. The developed deep learning-based multitrace SSD approach utilizes 2D/3D CNN to effectively extract information and overcome these limitations.
Article
Geochemistry & Geophysics
Yougong Xian, Riyan Lan, Yuchao Liu, Dunren Li, Jing Yang, Huaifeng Sun
Summary: In order to enhance the resolution of electromagnetic inversion for thin layers, this study focuses on the electromagnetic one-dimensional inversion. The smooth conductivity model from Occam's inversion cannot accurately represent the information of subterranean thin resistive layers, leading to incorrect inversion findings. To address this issue, an adaptive roughness matrix calculation method is proposed to improve the resolution of thin, low-resistive layers.
JOURNAL OF GEOPHYSICS AND ENGINEERING
(2023)
Article
Geosciences, Multidisciplinary
Fikret Dogru, Nafiz Maden
Summary: In this study, the gravity gradient tensor and invariant data were used to evaluate the hydrocarbon reservoirs in the Black Sea Basin. The depth of subsurface bodies was revealed using the Euler deconvolution technique. A comparison was made between significant invariant anomalies and known oil seepage and petroleum wells. The computed depth values of oil trace closest to the known Surmene and Hopa drill holes were 4809 m and 4455 m, respectively, based on the structural index values of SI=2.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Jifeng Zhang, Chaofeng Huang, Bing Feng, Yu Shi
Summary: The airborne transient electromagnetic method (ATEM) is widely used in mineral and resource exploration due to its speed and efficiency. This study proposes a segmented inversion method with lateral constraints to reduce errors and improve accuracy. The use of electrical information as lateral constraints or the inversion results of previous points ensures a continuous inversion profile. The application of the golden-section method guarantees quick and effective convergence.
JOURNAL OF APPLIED GEOPHYSICS
(2022)
Article
Geochemistry & Geophysics
Bo Zhang, Changchun Yin, Xue Han, Luyuan Wang, Yunhe Liu, Xiuyan Ren, Yang Su, Vikas Chand Baranwal
Summary: The flight altitude has a significant impact on airborne electromagnetic responses, and errors in recorded sensor altitudes can lead to erroneous results in AEM data interpretation. This article presents a 3-D inversion algorithm for AEM that considers flight height as an inversion parameter. The method successfully recovers the resistivity distribution underground and decreases altitude errors.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Engineering, Electrical & Electronic
Guoqing Zhou, Shuhua Long, Jiasheng Xu, Xiang Zhou, Bo Song, Ronghua Deng, Cheng Wang
Summary: This article compares and analyzes the performance of five waveform decomposition algorithms under different topographic conditions, revealing that the Gaussian algorithm has the largest fitting error in forested areas, the Adaptive Gaussian algorithm can fit complex waveforms but has more outliers, and the Gold and RL algorithms decompose the largest number of waveform components in forested areas. The Gold algorithm is effective for processing data in areas with dense vegetation at a lowest false component detection rate.
IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
(2021)
Article
Geochemistry & Geophysics
Shaojiang Wu, Yibo Wang, Fei Xie, Xu Chang
Summary: Locating microseismic sources is vital for monitoring hydraulic fractures in unconventional oil/gas exploration, geothermal operations, and CO2 sequestration. The crosscorrelation migration (CCM) method, based on waveform analysis, can accurately detect source locations without phase picking. This study introduces a CCM-HIC method for improved source imaging, which is demonstrated to be robust and yield higher spatial resolution even in the presence of strong noise.
Article
Geochemistry & Geophysics
Luo Xiao, Wang YanGuo, Ge KunPeneg, Deng JuZhi, Yang YaXin
Summary: This paper introduces the tilt-Euler method and six improved derivatives of directional tilt-gradient for fast estimation of magnetic source parameters. Single model test and multisource model test show that the directional tilt-Euler method has better continuity and accuracy with less interference.
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
(2021)
Article
Geochemistry & Geophysics
James Macnae
EXPLORATION GEOPHYSICS
(2015)
Article
Geochemistry & Geophysics
Alan Yusen Ley-Cooper, Andrea Viezzoli, Julien Guillemoteau, Giulio Vignoli, James Macnae, Leif Cox, Tim Munday
EXPLORATION GEOPHYSICS
(2015)
Editorial Material
Geochemistry & Geophysics
James Macnae
GEOPHYSICAL JOURNAL INTERNATIONAL
(2015)
Article
Geochemistry & Geophysics
James Macnae
Article
Geochemistry & Geophysics
Kate Hine, James Macnae
Article
Geochemistry & Geophysics
James Macnae
Article
Geochemistry & Geophysics
James Macnae, Kate Hine
Article
Geosciences, Multidisciplinary
James Macnae
JOURNAL OF APPLIED GEOPHYSICS
(2016)
Article
Geochemistry & Geophysics
James Macnae
Article
Geochemistry & Geophysics
Lachlan Hennessy, James Macnae
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Geochemistry & Geophysics
Xiuyan Ren, Changchun Yin, James Macnae, Yunhe Liu, Bo Zhang
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Geochemistry & Geophysics
Terence Kratzer, James Macnae
EXPLORATION GEOPHYSICS
(2014)
Article
Geosciences, Multidisciplinary
Aaron C. Davis, Raphael Dlugosch, Matthias Queitsch, James C. Macnae, Ronny Stolz, Andmike Mueller-Petke
GEOPHYSICAL RESEARCH LETTERS
(2014)
Article
Geochemistry & Geophysics
James Macnae, Xiuyan Ren, Tim Munday
Article
Geochemistry & Geophysics
James Macnae, Tim Munday, Camilla Soerensen