Investigation of density contrasts and geologic structures of hot springs in the Markazi Province of Iran using the gravity method

Nouraliee, Javad; Porkhial, Soheil; Mohammadzadeh-Moghaddam, M.; Mirzaei, Saeid; Ebrahimi, Davar; Rahmani, Mina

doi:10.1016/j.rgg.2015.11.011

Cited by 26 publications

(11 citation statements)

References 15 publications

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“…Regional gravity anomalies are generated by deep and large structures, whereas residual gravity anomalies are generated by shallow and small structures [8,28]. In this study, we are interested to reveal the shallow structure, so that the regional anomaly was removed.…”

Section: Deep Estimation and Anomaly Separation Of Complete Bouguer Amentioning

confidence: 99%

“…Several studies suggest that in geothermal exploration using gravity methods (not in all cases), negative gravity anomaly zones may be directly related to a fault and fracture zone or geothermal reservoirs [8,28]. The complete Bouguer anomaly also has not been able to explain the existence of a low anomaly or negative zone associated with geothermal manifestations of the faults and fractures structures in Suli and Tulehu.…”

Section: Relationship Between Gravity Anomaly and Geological Featuresmentioning

confidence: 99%

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The Study of Geological Structures in Suli and Tulehu Geothermal Regions (Ambon, Indonesia) Based on Gravity Gradient Tensor Data Simulation and Analytic Signal

et al. 2017

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Abstract:In early 2017, the geothermal system in the Suli and Tulehu areas of Ambon (Indonesia) was investigated using a gravity gradient tensor and analytic signal. The gravity gradient tensor and analytic signal were obtained through forward modeling based on a rectangular prism. It was applied to complete Bouguer anomaly data over the study area by using Fast Fourier Transform (FFT). The analysis was conducted to enhance the geological structure like faults as a pathway of geothermal fluid circulation that is not visible on the surface because it is covered by sediment. The complete Bouguer anomaly ranges of 93 mGal up to 105 mGal decrease from the southwest in Suli to the northeast in Tulehu. A high gravity anomaly indicates a strong magmatic intrusion below the Suli region. The gravity anomalies decrease occurs in the Eriwakang mountain and most of Tulehu, and it is associated with a coral limestone. The lower gravity anomalies are located in the north to the northeast part of Tulehu are associated with alluvium. The residual anomaly shows that the drill well TLU-01 and geothermal manifestations along with the Banda, and Banda-Hatuasa faults are associated with lowest gravity anomaly (negative zone). The gravity gradient tensor simulation and an analytic signal of Suli and Tulehu give more detailed information about the geological features. The g zz component allows accurate description of the shape structures, especially the Banda fault associated with a zero value. This result will be useful as a geophysical constraint to subsurface modeling according to gravity gradient inversion over the area.

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Section: Deep Estimation and Anomaly Separation Of Complete Bouguer Amentioning

confidence: 99%

Section: Relationship Between Gravity Anomaly and Geological Featuresmentioning

confidence: 99%

The Study of Geological Structures in Suli and Tulehu Geothermal Regions (Ambon, Indonesia) Based on Gravity Gradient Tensor Data Simulation and Analytic Signal

et al. 2017

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“…In a geothermal exploration program using the gravity method, generally but not in all cases, relative negative zones will be considerable as a fractured zone or a probable geothermal reservoir in an area (Nouraliee et al 2015). The existence Fig.…”

Section: Gravity Survey Data Acquisition and Processingmentioning

confidence: 99%

“…Geothermal fields in many sedimentary basins are distributed along fault-controlled linear trends (Nouraliee et al 2015). Also, almost all of the geothermal reservoirs in various geologic settings are commonly associated with fluid conducting faults.…”

Section: Fault Detectionmentioning

confidence: 99%

Integrated magnetic and gravity surveys for geothermal exploration in Central Iran

et al. 2016

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The Delijan region of Central Iran is a popular tourist spot due to the occurrence of hot springs and having the greatest geothermal fields in Iran. In the years 2011 and 2012, an integrated geophysical investigation, using magnetic and gravity methods, was conducted over the hot springs in order to characterize geophysical anomaly sources corresponding to the geothermal resources. The results of the geophysical investigations revealed the heat source and the reservoir of the Delijan geothermal system (DGS). Based on results of Euler depth estimation and 3D inversion of magnetic and gravity data, the depths and extension of the discovered structures were determined with a good correlation with the geological information. The results of magnetic interpretation show that the main source (heat source) of the geothermal system is located NE of the Delijan-Abgarm fault (DAf) zone at depths of 2500 to 5000 m, and the results of gravity interpretation show that the reservoir of the geothermal system is located along the DAf zone at depths of 1000 to 4000 m. Also, the horizontal gradients of gravity data reveal complex fault systems which are acting as the preferential paths to circulate the hydrothermal fluids.

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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%

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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Investigation of density contrasts and geologic structures of hot springs in the Markazi Province of Iran using the gravity method

Cited by 26 publications

References 15 publications

The Study of Geological Structures in Suli and Tulehu Geothermal Regions (Ambon, Indonesia) Based on Gravity Gradient Tensor Data Simulation and Analytic Signal

The Study of Geological Structures in Suli and Tulehu Geothermal Regions (Ambon, Indonesia) Based on Gravity Gradient Tensor Data Simulation and Analytic Signal

Integrated magnetic and gravity surveys for geothermal exploration in Central Iran

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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