Applications of Controlled Source and Natural Source Audio‐Frequency Magnetotellurics to Groundwater Exploration

Carlson, Norman R.; Paski, Phillip M.; Urquhart, Scott

doi:10.4133/1.2923511

Cited by 4 publications

(3 citation statements)

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“…These applications primarily focused on geothermal (e.g., Sandberg and Hohmann, 1982;Bartel and Jacobsen, 1987;Bromley, 1993;Wannamaker, 1997aWannamaker, , 1997b, mineral (e.g., Strangway et al, 1973;Boerner et al, 1993;Kellett et al, 1993;Chen et al, 2010;An and Di, 2010), and hydrocarbon (e.g., Hughes and Carlson, 1987). Other applications included groundwater surveys (e.g., Carlson et al, 2005), fault-zone mapping (e.g., Theodore and Sweetkind, 2011), and engineering detection (e.g., Unsworth et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Mineral Exploration using CSAMT data: Application to Longmen region metallogenic belt, Guangdong Province, China

Peng

Guiju

et al. 2013

GEOPHYSICS

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A controlled-source audio-frequency magnetotelluric (CSAMT) survey has been carried out to investigate potential iron (Fe) and polymetallic (Pb-Zn-Cu) deposits in Longmen region, which is one of the main metallogenic belts in southern China. Conducting geophysical surveys in this area is quite difficult due to mountainous terrain, dense forest, and thick vegetation cover. A total of 560 CSAMT soundings were recorded along twelve surveying lines. Two-dimensional Occam's inversion scheme was used to interpret these CSAMT data. The resulting electric resistivity models showed that three large-scale highly conductive bodies exist within the surveying area. By integrated interpretation combined with available geologic, geophysical, and geochemical data in this area, three prospective mineral deposits were demarcated. Based on the CSAMT results, a borehole penetrating approximately 250-m depth was drilled at the location of 470 m to the northwest end of line 06, defined with a massive pyrite from the depth of 52-235 m with 7%-16% Fe content, as well as locally highgrade Pb-Zn-and Ag-Ti-bearing ores.

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Section: Introductionmentioning

confidence: 99%

Mineral Exploration using CSAMT data: Application to Longmen region metallogenic belt, Guangdong Province, China

Peng

Guiju

et al. 2013

GEOPHYSICS

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“…Controlled source audio‐frequency magnetotelluric (CSAMT) is one of the geophysical methods widely used in resource exploration and engineering geophysics (Basokur et al., 1997; Xiong et al., 2019). It is known as a suitable method in the subsurface mapping of groundwater, especially at a depth of approximately 1 km (Carlson et al., 2005; Fu et al., 2013). The two‐ and three‐dimensional CSAMT inversions are presumed to reflect the real underground resistivity model, and the layer demarcation is still based on the speculation of the values of the model‐calculated resistivity (CRM) (Xiong et al., 2019; Zonge & Hughes, 1991).…”

Section: Introductionmentioning

confidence: 99%

A novel approach for water reservoir mapping using controlled source audio‐frequency magnetotelluric in Xingning area, Hunan Province, China

Kouadio

Liu

Malory

et al. 2023

Geophysical Prospecting

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Controlled source audio‐frequency magnetotelluric is frequently used in association with other geophysical methods, especially in complex geological areas to highlight geological structures such as water reservoir rock. Although it gives satisfactory results, combining several methods requires time and expense. In addition, despite this combination, several drilling locations proposed after geophysical investigations were inaccurate, resulting in many unsuccessful drillings. The latter occurs due to the difficulty to emphasize the fracture zones properly. To work around this problem, we proposed a novel approach called pseudostratigraphic to reduce the repercussion of unsuccessful drilled boreholes and to demarcate the water reservoir rock. The technique consists to discretize the resistivity of the inverted OCCAM2D model based on the true layer resistivities collected from the borehole log data (observed layers). The discrete resistivity model is known as the new resistivity model. It is used to generate the pseudostratigraphic log at each station by pseudo‐demarcating the thicknesses of the observed layers with a low margin of error. Moreover, the combination of multiple new resistivity models from different survey lines creates a three‐dimensional pseudostratigraphic map useful to emphasize the water reservoir rock. The pseudostratigraphic implementation is carried out in the Xingning area as a real‐world case study. The results show that the intersection of the main fault (F1) and the conductive zones (≤100 Ω m) indicates the potential water reservoir rock. Its thickness is estimated around 150–600 with an error equal to ± 7°m. Based on the three‐dimensional pseudostratigraphic map, the water found in the fracture zone located under the reservoir rock is considered much hotter due to the intense geothermal activity along F1, thereby making it a better place for hot water exploitation. Finally, the pseudostratigraphic technique could be an innovative and cheap strategy to find groundwater reservoirs in complex geological areas.

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“…Moreover, the data whose magnitude is pretty high make it necessary to use computer to identify and modify the outliers. At present, American SCSINV t wo-dimensional inversion tool and a piece of software for one-dimensional inversion developed by the Phoenix-Geophysics Company in Canada are the most popular ones used in the CSAMT [9][10] . To deal with the interaction problem involved, a userfriendly interactive mode is proposed when we ed it the multi-parameter sounding curve of a single point.…”

Section: Introductionmentioning

confidence: 99%

A Selection Algorithm of Survey Lines and the Interactive Mode of the Sounding Curve

Lyu

Zhang

et al. 2015

Proceedings of the 21st International Conference on Industrial Engineering and Engineering Management 2014

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To solve the data interaction fault of threedimensional CS AMT model, a three-dimensional selection algorithm of survey lines is proposed. The survey lines are generated in a batch, based on the pre-given direction and distance error. By comparing the distances of survey points with the error, a series of survey lines can be formed by turns. The computing load is primarily concentrated on the sort of distances of survey points. In addition, we introduce an interactive mode of the sounding curve for single survey point displayed in a group of one survey line. The outliers of the observation data curve can be revised by intercepting, when editing the sounding curve of one specific point.

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Applications of Controlled Source and Natural Source Audio‐Frequency Magnetotellurics to Groundwater Exploration

Cited by 4 publications

References 0 publications

Mineral Exploration using CSAMT data: Application to Longmen region metallogenic belt, Guangdong Province, China

Mineral Exploration using CSAMT data: Application to Longmen region metallogenic belt, Guangdong Province, China

A novel approach for water reservoir mapping using controlled source audio‐frequency magnetotelluric in Xingning area, Hunan Province, China

A Selection Algorithm of Survey Lines and the Interactive Mode of the Sounding Curve

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