Exploration of buried carbonate aquifers by the inverse and forward modelling of the Controlled Source Audio-Magnetotelluric data

Šumanovac, Franjo; Orešković, Jasna

doi:10.1016/j.jappgeo.2018.04.007

Cited by 10 publications

(4 citation statements)

References 22 publications

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“…As shown in Figure 12, a goaf with accumulated water is detected as an anomaly with a low apparent resistivity. CSAMT can be used to detect the distribution of groundwater and identify the geological structures in coal seams and gas-rich areas [62]. It has a moderate detection depth, and it is suitable for exploring water and mineral resources owing to the strong and high-quality observation signals.…”

Section: Controllable-source Audio Magnetotelluricsmentioning

confidence: 99%

Methods for the Geophysical Exploration and Sustainable Utilisation of Coalbed Methane Resources in Abandoned Mines of Shanxi, China

Liu,

Li,

2024

Sustainability

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Underground coal mining results in large goafs and numerous abandoned mines that contain substantial amounts of coalbed methane. If this methane is not used and controlled, it will escape into the atmosphere through geological fractures and can result in serious greenhouse gas effects and environmental damage. Exploring and developing the coalbed methane resources of abandoned mines can not only improve coal mine safety and protect the ecological environment but also reuse waste and mitigate energy shortages. Geophysical methods have made some progress in detecting abandoned coal mines, but there are still some challenges and difficulties. The resolution of seismic exploration may not be enough to accurately describe the details of coal seams and CBM rich areas, and the effect of resistivity method in deep CBM exploration is limited. In addition, the geological structure of abandoned coal mines is usually more complex, such as faults, folds, etc., which makes the application of exploration methods more difficult and increases the difficulty of data interpretation. Therefore, it is necessary to develop and perfect exploration technology continuously including the application of geophysical big data, deep learning, and artificial intelligence inversion to realize the accurate detection and evaluation of CBM resources in abandoned coal mines.

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Section: Controllable-source Audio Magnetotelluricsmentioning

confidence: 99%

Methods for the Geophysical Exploration and Sustainable Utilisation of Coalbed Methane Resources in Abandoned Mines of Shanxi, China

Liu,

Li,

2024

Sustainability

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“…In recent years, the Controlled Source Audio Geodetic Electromagnetic Method (CSAMT) has been developing rapidly, and its application in the detection of geological structures [5], geothermal [6] and minerals [7] has achieved remarkable results. In particular, CSAMT is used to detect underground geological structures with the characteristics and advantages of high resolution, high reliability and large detection depth, and it can effectively detect, identify and differentiate stratigraphic structures and fracture structures [8].…”

Section: Introductionmentioning

confidence: 99%

Application of CSAMT method in fine exploration of karst collapse columns in coal mines: a case study of Shanxi Province, China

Du,

Wang,

et al. 2024

Second International Conference on Environmental Remote Sensing and Geographic Information Technology (ERSGIT 2023)

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Karst collapse columns are prone to cause severe water surges during mining activities, resulting in many casualties and property losses. In order to assess the impact of karst collapse columns on the excavation of the No. 3 coal seam of coal industry in Shanxi, this study used the Controlled Source Audio Geodetic Electromagnetic Method (CSAMT) to investigate the structural characteristics and hydrogeological conditions of two undisclosed karst collapse columns. It then scientifically evaluated the hydraulic conductivity hazards of the karst collapse columns. According to the line-view resistivity cross-section, the X1 karst collapse column mainly developed the Rockfill segment and slurry section, there is the possibility of sudden water. The DX17 karst collapse column presents relatively high resistivity electrically, the overall water-bearing performance is poor, and there is no sudden water hazard for mining and digging. The study results are of guiding significance to the water control work of traversing downhole and exposing karst collapse columns in the Ordovician high-bearing pressure water production workings.

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“…In addition, electrical tomography provides a more precise definition of lithological and structural relationships in the explored area. Electromagnetic methods, including the magnetotelluric method, especially controlled-source audio-magnetotellurics (CSAMT) [7] and the transient electromagnetic method (TEM or TDEM), can be also used in such explorations [8,9]. Both methods are also based on rock resistivity measurements, and similar results are expected as with electrical tomography methods, but they have an advantage in greater depth penetrations, those exceeding 100 m. However, their negative side is high sensitivity to electrical noises, which can often be unavoidable in shallow explorations.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Near-Surface Geophysical Methods Used to Discover Karst Bauxite Deposits in the Dinarides Using the Example of Posušje Area, Bosnia and Herzegovina

Šumanovac,

Kapuralić,

Pavičić

et al. 2024

Minerals

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Geophysical exploration of bauxite deposits has been carried out in the area of Posušje in Bosnia and Herzegovina, which were formed on an Upper Cretaceous carbonate substrate, whereas the hanging wall rocks can be Paleogene limestones and sedimentary clastic rocks. Karst terrains are demanding for geophysical exploration due to the relatively complex geological relationships and exceptional near-surface inhomogeneities that generate large noises and challenging conditions for taking field measurements. The fundamental question is whether geophysical research can detect exceptionally irregular karst bauxite deposits with relatively small dimensions. The basic idea is to combine several geophysical methods and a joint interpretation of several data sets to increase the efficiency of geophysical surveying in detecting complex bauxite deposits in karst terrains. Therefore, fundamental near-surface research methods, electrical tomography and seismic refraction are used. In addition, magnetometry was used to examine whether bauxite deposits yield potential magnetic anomalies that could help in detecting them. Research undertaken in the area of Posušje was carried out in the first step on already discovered and known bauxite deposits to determine whether geophysical responses correlate with the occurrence of bauxite deposits and to evaluate the effectiveness of each of the applied surface geophysical methods. Measurements were taken at several locations, and results for two micro-locations, Krstače and Mratnjača, are shown. Geophysical measurements were firstly performed on discovered bauxite deposits in order to reliably determine the possibility of identifying deposits in geophysical inverse models. Bauxite deposits were clearly recognised as characteristic geophysical responses in inversion models using both methods, electrical tomography and seismic refraction. Although the response of bauxite deposits is expressed in both models, resistivity and velocity, it is much more evident in resistivity models. The characteristic resistivity response was confirmed by the discovery of a new deposit. Therefore, the conclusion is that electrical resistivity tomography should be considered a basic method for exploring karst bauxite deposits. Seismic refraction provides a better characterisation of deposits and reduces the interpretation ambiguity. This solution can generally be applied to the problem of researching bauxite deposits in the Dinarides and similar geological models in the Mediterranean. Magnetometric measurements have shown that no magnetic anomalies could be associated with bauxite deposits, and only magnetometry was not successful in discovering bauxite deposits.

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Exploration of buried carbonate aquifers by the inverse and forward modelling of the Controlled Source Audio-Magnetotelluric data

Cited by 10 publications

References 22 publications

Methods for the Geophysical Exploration and Sustainable Utilisation of Coalbed Methane Resources in Abandoned Mines of Shanxi, China

Methods for the Geophysical Exploration and Sustainable Utilisation of Coalbed Methane Resources in Abandoned Mines of Shanxi, China

Application of CSAMT method in fine exploration of karst collapse columns in coal mines: a case study of Shanxi Province, China

Assessment of Near-Surface Geophysical Methods Used to Discover Karst Bauxite Deposits in the Dinarides Using the Example of Posušje Area, Bosnia and Herzegovina

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