Integrated geophysical investigations in the Hisar geothermal field, Demirci, western Turkey

Özürlan, Gülçin; Şahin, Mihriban

doi:10.1016/j.geothermics.2005.11.004

Cited by 7 publications

(4 citation statements)

References 8 publications

(14 reference statements)

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“…In recent years, geophysical methods have been commonly used in the investigation and development of geothermal resources, especially with the development of technology, and these methods have provided successful results (Majumdar et al 2000;El-Quady 2006;Özürlan and Şahin 2006;Drahor and Berge 2006;Abiye and Haile 2008;Wu et al 2012). Although many geophysical methods are used in geothermal fields, electrical resistivity is one of the most preferred methods for investigating many geothermal fields.…”

Section: Methodsmentioning

confidence: 99%

Conceptual model of the Şavşat (Artvin/NE Turkey) Geothermal Field developed with hydrogeochemical, isotopic, and geophysical studies

et al. 2019

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The Şavşat (Artvin, Turkey) Geothermal Field (ŞGF) is located on the northeastern border of Turkey. This field is characterized by thermal and mineralized springs and travertine. The temperature of the thermal water is 36 °C, whereas that of the mineralized spring in the area is approximately 11 °C. The Na-HCO 3 -Cl-type thermal water has a pH value of 6.83 and an EC value of 5731 µS/cm. The aim of this study is to characterize the geothermal system by using geological, geophysical, and hydrogeochemical data and to determine its hydrochemical properties. A conceptual hydrogeological model is developed for the hydrogeological flow system in the ŞGF. According to the hydrogeological conceptual model created by geological, geophysical, and hydrogeochemical studies, the reservoir comprises volcanogenic sandstone and volcanic rocks. The cap rock for the geothermal system is composed of turbiditic deposits consisting of mudstone-siltstone-sandstone alternations. An increase in the geothermal gradient is mainly due to Pleistocene volcanic activity in the field. The isotopic values of thermal water (δ 18 O, δ 2 H, δ 3 H) indicate a deeply circulating meteoric origin. The estimated reservoir temperature calculated by silica geothermometers is 100-150 °C, and the mixing rate of cold groundwater with geothermal waters is approximately 70%. It may be possible to obtain warmer fluids from a 300-m-deep borehole cutting through a fracture zone identified by geophysical studies. Heating by conduction via the geothermal gradient resulting from young volcanic activity drives geothermal waters upwards along faults and fractures that act as hydrothermal pathways. The positive δ 13 C VPDB value (+ 4.31‰) indicates a metamorphic origin for the thermal water. The 34 S CDT value (~ 10‰) shows that the sulfur in the geothermal water is derived from volcanic sulfur (SO 2 ). which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.hydrogeochemical and isotope techniques have been widely used elsewhere to determine the hydrodynamic structure of geothermal systems in recent years (Tarcan et al. 2005;Piscopo et al. 2006; Schaffer and Sass 2014; Yurteri and Şimşek 2017;Uzelli et al. 2017). In this geothermal field, there has not been any study that employs a conceptual approach based on hydrogeological and hydrogeochemical studies, such as hydrochemical facies compositions, isotopic features, water-rock interactions, mixing processes, and reservoir temperature. This study focuses on understanding the mechanism of the geothermal system in the ŞGF for future use, determining the areas with higher temperatures and revealing the hydrogeochemical characteristics of the geothermal water. In accordance with this purpose, geological, geophysical, and hydrogeochemical studies were performed in the area to characterize components such as the reservoir, geothermal fluids, and...

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Section: Methodsmentioning

confidence: 99%

Conceptual model of the Şavşat (Artvin/NE Turkey) Geothermal Field developed with hydrogeochemical, isotopic, and geophysical studies

et al. 2019

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“…In comparison, two potential electrodes, M and N, are connected to a voltameter. The current intensity parameters are arranged in series, and the potential difference ΔV between electrodes M and N are measured [12], [24]. Mathematically, apparent resistivity ρA is calculated as follows:…”

Section: Electrical Resistivitymentioning

confidence: 99%

Geoelectrical model of geothermal spring in Ie Jue Seulawah deriving from 2D VLF-EM and DC resistivity methods

et al. 2023

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Seulawah Agam is one of the volcanic areas in Aceh province, Indonesia, which planned for a powerplant constriction with an energy capacity expected to be approximately 230 MWe. This volcano has seven manifestations in the form of craters, hot water, and heated soil. The hydrothermal system in this volcano is controlled by a fault system which acts as a medium for the entry and exit of fluids. Therefore, understanding the local geology is required for geothermal power plant development, especially for the determination area for injection and production wells. In this research, we use the Very Low-Frequency Electromagnetic (VLF-EM) methods combined with electrical resistivity tomography data on the Ie Jue manifestation area to determine the shallow structure related to the manifestation. The VLF was made for 4 profiles with 700 m length for each VLF-EM profile and 300 m for electrical resistivity lines. We utilized the Karous Hjelt filter for qualitative interpretation, while Occam's algorithm was applied for 2D inversion of data for quantitative analysis of VLF-EM data. Based on the current density model, several vertical conductive anomalies can be well demonstrated at a distance of 300-400 m from the four VLF profiles. The conductive anomaly can also be seen in the resistivity data from the electrical resistivity. The results of the Occam model show that the depth of faults and fractures is seen at 30 m depth with low resistivity (below 100 Ωm). This anomaly is generally associated with outcrops in the field, such as fumarole and warm ground on the east side of the manifestation area. In addition, the 2D inversion model of VLF also shows the contrast of several fracture zones as a place for fluid to enter and exit the Seulawah volcano. Therefore, based on our result, it can be summed up that this method is effectively applied to geothermal in high terrain areas such as in Indonesia and can be used to suggest safe locations for injection wells and production of geothermal drilling.

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“…Given the success and application potential of the individual techniques, it would be reasonable to assume that integrated ERT, SP and GPR surveys are common in near‐surface hydrological contexts. In the past few years, self‐potential has been combined with other geophysical methods, including ERT and electromagnetics (Sharma and Baranwal ; Ozurlan and Sahin ; Wishart et al . ) whilst combining ERT and GPR has always been popular.…”

Section: Geophysical Techniques For Near‐surface Hydrological Investmentioning

confidence: 99%

The geophysical investigation of lake water seepage in the regulated environment of the Bosherston Lily Ponds, South Wales, UK. Part 1: natural, fracture‐related pathways

Husband

Cassidy

Stimpson

2009

Near Surface Geophysics

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The detection and characterization of hydrological pathways is applicable to many branches of geosciences including contaminant hydrogeology, mining, civil engineering and petroleum geology. Geological features play a critical role in fluid transportation through the presence of enhanced hydraulic conductivity pathways, although determining their exact contribution is difficult. This paper reports the results of geophysical investigations at the Bosheston Lily Ponds in Pembroke, South Wales, UK where the lake system has experienced unexplained water loss for over thirty years. The area is classified a Special Area of Conservation (SAC) and is managed under tight regulatory regime that limits the scope and extent of any site investigations. Geophysical surveys focused on identifying any natural hydraulic conduits/pathways in the underlying carboniferous limestone where the main objectives were to determine whether bedrock fracturing is promoting natural water loss. Ground-penetrating radar (GPR), electrical resistance tomography (ERT) and self-potential (SP) surveys were collected at targeted site locations and the information gained used to ascertain the nature of the observed/predicted lake water loss. The results show that localized zones of high-density, small-scale fracturing in the limestone bedrock are likely to be the predominant cause of lake water loss with little evidence of larger scaled, open karstic features. along the lakeside and open access environments near the dam (i.e., the coastal dune and beach areas only). Previous, unpublished hydrological investigations, including dye tracer experiments and hydrological modelling, have proved inconclusive

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Integrated geophysical investigations in the Hisar geothermal field, Demirci, western Turkey

Cited by 7 publications

References 8 publications

Conceptual model of the Şavşat (Artvin/NE Turkey) Geothermal Field developed with hydrogeochemical, isotopic, and geophysical studies

Conceptual model of the Şavşat (Artvin/NE Turkey) Geothermal Field developed with hydrogeochemical, isotopic, and geophysical studies

Geoelectrical model of geothermal spring in Ie Jue Seulawah deriving from 2D VLF-EM and DC resistivity methods

The geophysical investigation of lake water seepage in the regulated environment of the Bosherston Lily Ponds, South Wales, UK. Part 1: natural, fracture‐related pathways

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