Assessment of geothermal energy potential by geophysical methods: Nevşehir Region, Central Anatolia

Kıyak, Alper; Karavul, Can; Gülen, Levent; Pekşen, Ertan; Kiliç, Ali Rıza

doi:10.1016/j.jvolgeores.2015.03.002

Cited by 18 publications

(8 citation statements)

References 22 publications

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“…Several geothermal studies have been conducted to understand the geothermal capacity of the Aegean region using different methods. Important geothermal areas (Table 1) of the study region have been compiled from different studies [Basel et al 2009, Erkan 2015, Kiyak et al 2015.…”

Section: Tectonic Geological and Geothermal Settingsmentioning

confidence: 99%

Three-Dimensional Seismic Velocity Structure of the Aegean Region of Turkey from Local Earthquake Tomography

Özer

Gök

Polat

2018

Annals of Geophysics

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This study brings new insights to elucidate the three dimensional (3-D) seismic velocity structure of the Aegean region of Turkey by using Local Earthquake Tomography (LET). The study area has remarkable potential for geothermal resources. To provide the subsurface geological structure of seismogenic layers and geothermal areas, we develop new high-resolution depth-cross sections through Buyuk Menderes, Kucuk Menderes and Gediz grabens. Travel times of almost 265.000 readings (14.963 P-phase and 11.969 S-phase picks) from 2.085 well-located events recorded between 2007 and 2016 by a permanent seismic network of 75 broad-band seismometers were used to precisely interpret the 3-D Vp (lithological) and Vp/Vs (petrological) models of the study area. We detected four main layers down to 35-40 km depths with different Vp velocities ranging from 3.5 to 8.5 km/s. Mid-crustal interface (Conrad discontinuity) is discovered at 15 km depth in nearly all depth-cross-sections. Our results suggest an average of 25 km Moho depth in the Aegean region of Turkey. The depths range from around 18 km beneath SE of

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Section: Tectonic Geological and Geothermal Settingsmentioning

confidence: 99%

Three-Dimensional Seismic Velocity Structure of the Aegean Region of Turkey from Local Earthquake Tomography

Özer

Gök

Polat

2018

Annals of Geophysics

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“…It is therefore useful for finding buried geological objects and structures, such as igneous intrusions as a heat source of geothermal system; and some faults that usually control the existance of geothermal manifestation [12][13][14]. The measurement of gravity on land and in the air using airborne gravity for geothermal exploration has rapidly grown [15].…”

Section: Gravity Measurementmentioning

confidence: 99%

The Effect of Gravity Measurement Distribution Points on Interpretation of Gravity Data in the Gunung Endut Geothermal Prospect Area, Indonesia

Supriyanto

Rokhmatuloh

Sobirin

et al. 2018

GEOMATE

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ABSTRACT:The geothermal prospect located at Gunung Endut was investigated in 1980s based on reconnaissance surveys, primarily on geological and geochemical aspects. Then in 2006 a gravity measurement with 247 stations was carried out. However, due to the distribution of the gravity station was less than optimal, interpretation of gravity data was not suitable with the geological situation that support geothermal system. To ensure this, we have carried out a new gravity survey with 134 random stations distribution but remained concentrated on hot spring locations. Data from both measurements were processed by the same treatment starting from pre-processing with some standar corrections to obtain complete Bouguer anomaly, then continue by filtering process to separate regional and residual gravity anomaly using Butterworth filter in a wavenumber domain. Residual gravity anomaly map obtained by random position of stations is more resemble to the geological features developed in the prospect area. The contrast boundaries of the residual gravity anomaly value coincide with the fault-line structures recorded in the surface geological data. This result is better when compared with previous measurements. This study shows that there is a significant influence of the distribution pattern of the gravity stations which affects the conformity with the geological data. Based on the new interpretation result, the structural features in the prospect area are characterized by the complex fault structures that intersected each other mainly close to the surface manifestations. This intersection area is expected to be an enhanced permeability zone so that the hydrothermal fluid can flow to the surface. The interpretation of new gravity data combined with the results of geochemical analysis can be used for more understanding of the geothermal system beneath Gunung Endut prospect area.

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“…It was successfully used to characterize subsurface structural and geothermal exploration (Khalil et al 2014;Kıyak et al 2015;Nouraliee et al 2015). In order to estimate the depth to the top of geothermal resource and position of the structural lineaments, 3D Euler deconvolution was applied on the residual gravity data in the studied area.…”

Section: Determination Of Depth and Location Of The Geothermal Anomalymentioning

confidence: 99%

“…Gravity surveys are also used in the geothermal exploration to map lateral density variations because of a density difference between the continental crust and an intruding magmatic body. They also help in revealing the fracture zones that are located in the geothermal field (Kıyak et al 2015). Seismic activity or earthquake distribution could be affected by tectonic regime and be the main reason for the possibility of geothermal anomaly which could be responsible for the observed Curie depths (Bektaş 2013;Aboud et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Curie Point Depth, Geothermal Gradient and Heat-Flow Estimation and Geothermal Anomaly Exploration from Integrated Analysis of Aeromagnetic and Gravity Data on the Sabalan Area, NW Iran

Afshar

Norouzi

Moradzadeh

et al. 2016

Pure Appl. Geophys.

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Prospecting the geothermal resources in northwest of Iran, conducted in 1975, revealed several promising areas and introduced the Sabalan geothermal field as a priority for further studies. The Sabalan Mt., representing the Sabalan geothermal field, is a large stratovolcano which consists of an extensive central edifice built on a probable tectonic horst of underlying intrusive and effusive volcanic rocks. In this study, Curie point depth (CPD), geothermal gradient and heat-flow map were constituted from spectral analysis of the aeromagnetic data for the NW of Iran. The top of the geothermal resource (i.e., the thickness of the overburden) was evaluated by applying the Euler deconvolution method on the residual gravity data. The thickness of the geothermal resource was calculated by subtracting the Euler depths obtained from the CPDs in the geothermal anomalous region. The geothermal anomalous region was defined by the heat-flow value greater than 150 mW/m 2 . CPDs in the investigated area are found between 8.8 km in the Sabalan geothermal field and 14.1 in the northeast. The results showed that the geothermal gradient is higher than 62°C/km and the heat-flow is higher than 152 mW/m 2 for the geothermal manifestation region; the thickness of the geothermal resource was also estimated to vary between 5.4 and 9.1 km. These results are consistent with the drilling and other geological information. Findings indicate that the CDPs agree with earthquake distribution and the type of thermal spring is related to the depth of the top of the geothermal resource.

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Assessment of geothermal energy potential by geophysical methods: Nevşehir Region, Central Anatolia

Cited by 18 publications

References 22 publications

Three-Dimensional Seismic Velocity Structure of the Aegean Region of Turkey from Local Earthquake Tomography

Three-Dimensional Seismic Velocity Structure of the Aegean Region of Turkey from Local Earthquake Tomography

The Effect of Gravity Measurement Distribution Points on Interpretation of Gravity Data in the Gunung Endut Geothermal Prospect Area, Indonesia

Curie Point Depth, Geothermal Gradient and Heat-Flow Estimation and Geothermal Anomaly Exploration from Integrated Analysis of Aeromagnetic and Gravity Data on the Sabalan Area, NW Iran

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