Interpretation of gravity data to delineate the geothermal reservoir extent and assess the geothermal resource from low-temperature fluids in the Municipality of Isa, Southern Kyushu, Japan

Pocasangre, Carlos; Fujimitsu, Yasuhiro; Nishijima, Jun

doi:10.1016/j.geothermics.2019.101735

Cited by 13 publications

(5 citation statements)

References 60 publications

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“…Here, the horizontal derivatives (Ekinci & Yi gitbas ¸, 2015;Pocasangre, Fujimitsu, & Nishijima, 2020) are computed in the space domain, and the vertical derivative is computed in the frequency domain (Ekinci, Ertekin, & Yi gitbas ¸, 2013; Pilkington & Keating, 2004). Wijns, Perez, and Kowalczyk (2005) introduced the TM (THETA) method, which is the normalization of the horizontal gradient amplitude by the total gradient amplitude:…”

Section: Methodsmentioning

confidence: 99%

“…The TDR is one of the most used methods for the determination of the edges of potential field source. The TDR of the potential field F is defined as follows (Miller & Singh, 1994; Oruç, 2011):

TDR = atan \frac{\frac{∂F}{∂z}}{\sqrt{{(\frac{∂F}{∂x})}^{2} + {(\frac{∂F}{∂y})}^{2}}} .

Here, the horizontal derivatives (Ekinci & Yiğitbaş, 2015; Pocasangre, Fujimitsu, & Nishijima, 2020) are computed in the space domain, and the vertical derivative is computed in the frequency domain (Ekinci, Ertekin, & Yiğitbaş, 2013; Pilkington & Keating, 2004).…”

Section: Methodsmentioning

confidence: 99%

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Delineating structural features of North Cameroon using the EIGEN6C4 high‐resolution global gravitational model

Ghomsi

Pham²,

Steffen

et al. 2022

Geological Journal

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The Cretaceous basins of the West and Central African Rift System (WCARS) are characterized by sinistral strike-slip movements observed between the Benue and Arabian-Nubian microplates. These basins share a similar basin-filling structure, history, and tectonic processes. They have attracted a significant interest in the study of their geodynamics and subsurface structure through geophysical exploration methods. Nevertheless, North Cameroon located in this microplate confluence has not yet been investigated in terms of identifying geological structures, such as lineaments and faults. To contribute to a better understanding of the northern Cameroon structural framework and its tectonic context, we investigate the lineaments in northern Cameroon by using the EIGEN-6C4 gravitational model and a variety of recent processing techniques (Tilt derivative [TDR], Theta Map [TM], Horizontal tilt angle [TDX], and Edge Detector [ED]). Our results show that the lineaments are trending in ENE-WSW, NW-SE, NE-SW, and WNW-ESE directions. These directions are consistent with the Cretaceous Garoua Rift and granitoids of the Cameroon-Chad line. The presented result clearly delineates continuous architectonic features of the structural edges of the Saharan Metacraton, the Cretaceous Garoua Rift, the Bibemi-Léré granitoids, and the Adamawa faults.

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Section: Methodsmentioning

confidence: 99%

“…The TDR is one of the most used methods for the determination of the edges of potential field source. The TDR of the potential field F is defined as follows (Miller & Singh, 1994; Oruç, 2011):

TDR = atan \frac{\frac{∂F}{∂z}}{\sqrt{{(\frac{∂F}{∂x})}^{2} + {(\frac{∂F}{∂y})}^{2}}} .

Section: Methodsmentioning

confidence: 99%

Delineating structural features of North Cameroon using the EIGEN6C4 high‐resolution global gravitational model

Ghomsi

Pham²,

Steffen

et al. 2022

Geological Journal

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“…(N) is a structural index defined as the field deflection rate in terms of distance from the source and is selected based on previous information from the source geometry [14] [15]. (for gravimetric data (N = 0) for dykes, (N = 1) for horizontal cylinders and Vertical and (N = 2) for butter) [44].…”

Section: Quantitative Interpretationmentioning

confidence: 99%

Geophysical Study: Estimation of Deposit Depth Using Gravimetric Data and Euler Method (Jalalabad Iron Mine, Kerman Province of IRAN)

Shirazy¹,

Ширази²,

Nazerian³

et al. 2021

OJG

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Mineral exploration is done by different methods. Geophysical and geochemical studies are two powerful tools in this field. In integrated studies, the results of each study are used to determine the location of the drilling boreholes. The purpose of this study is to use field geophysics to calculate the depth of mineral reserve. The study area is located 38 km from Zarand city called Jalalabad iron mine. In this study, gravimetric data were measured and mineral depth was calculated using the Euler method. 1314 readings have been performed in this area. The rocks of the region include volcanic and sedimentary. The source of the mineralization in the area is hydrothermal processes. After gravity measuring in the region, the data were corrected, then various methods such as anomalous map remaining in levels one and two, upward expansion, first and second-degree vertical derivatives, analytical method, and analytical signal were drawn, and finally, the depth of the deposit was estimated by Euler method. As a result, the depth of the mineral deposit was calculated to be between 20 and 30 meters on average.

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“…Seismic methods mainly include reflection seismic and micro-motion methods [22][23][24]. The main role of gravimetry in mid-deep geothermal detection is to extract geological information related to basement undulations, hidden faults and local structures, etc., to reflect the regional structures and to locate the favorable areas for heat storage [25][26][27]. In recent years, the electromagnetic method has become the preferred method for mid-deep geothermal exploration due to its advantages in detection accuracy To distinguish "geothermal resources", the mid-deep geothermal resources are classified as the hydrothermal type and dry hot rock type [4,6].…”

Section: Introductionmentioning

confidence: 99%

The Applications of WFEM in the Exploration of Medium-Depth Geothermal Resources

Fu,

Li,

Zhang

et al. 2024

Energies

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Medium-depth geothermal energy mainly consists of two types, hydrothermal and dry-heat rock. With huge resource reserves, its exploration and development are of great significance to the transformation of China’s energy structure and the realization of the goal of “Double-Carbon”. From the differences in the electrical characteristics between hydrothermal and hot dry rock geothermal resources, this project uses the numerical modeling of the wide field electromagnetic (WFEM) method as a tool to design a model of typical geothermal resources. Then, we summarize and analyze the detection capability of the WFEM by calculating the WFEM response under the conditions of different depths, resistivity values, thickness-to-depth ratios and other parameters. Moreover, aiming at the key problems faced by the WFEM in real applications, we discuss the factors affecting the detection accuracy and give solutions to improve the reliability of the detection results. Finally, the medium-depth geothermal energy detection in the Jiyang Depression of Shandong is presented as an example, showing how the WFEM detection technique was used with the inversion result profile obtained. By comparing the results of geomagnetic and seismic detection on the same survey line, it is demonstrated that the WFEM method has great potential in the exploration of medium-depth geothermal energy and can be the preferred method.

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Interpretation of gravity data to delineate the geothermal reservoir extent and assess the geothermal resource from low-temperature fluids in the Municipality of Isa, Southern Kyushu, Japan

Cited by 13 publications

References 60 publications

Delineating structural features of North Cameroon using the EIGEN6C4 high‐resolution global gravitational model

Delineating structural features of North Cameroon using the EIGEN6C4 high‐resolution global gravitational model

Geophysical Study: Estimation of Deposit Depth Using Gravimetric Data and Euler Method (Jalalabad Iron Mine, Kerman Province of IRAN)

The Applications of WFEM in the Exploration of Medium-Depth Geothermal Resources

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