Magnetotelluric Investigations in Tuwa-Godhra Region, Gujarat (India)

Mohan, Kapil; Chaudhary, Peush; Kumar, G. Pavan; Kothyari, Girish Ch; Choudhary, Virender; Nagar, Mehul; Patel, Piyushkumar N.; Gandhi, Drasti; Kushwaha, Dilip; Rastogi, B. K.

doi:10.1007/s00024-018-1883-0

Cited by 8 publications

(6 citation statements)

References 27 publications

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“…Because of its low resistivity, this layer was possibly assigned as a clay cap layer and stretched from 0 km to 11 km. Tracts three and four revealed that both models were traversed by minor faults associated with the Sumatra fault and followed a similar pattern.This is because a geological faulting region causes significant fracturing, resulting in a permeable subsurface zone, which acts as a channel for geothermal fluids to flow from the reservoir to the surface [11], [24]. The pseudo-2D modeling from 1D input of MT data confirmed the subsurface geological condition through the generated resistivity variation.…”

Section: D Cross-section From 1d Inversionmentioning

confidence: 68%

“…As a result, relatively broad data distribution is required to cover the entire volcano. Geothermal power sources are ideal for measuring targets using electromagnetic methods, as they produce substantial variations in subsurface electrical resistivity [23], [24], wherein thermal areas, electrical resistivity is substantially different and generally lower than in areas with cooler subsurface temperatures. In terms of temperature difference, anomaly targets could be easily distinguished from the surrounding area that contains rocks [25], [26].…”

Section: Introductionmentioning

confidence: 99%

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Geothermal reservoir depth of Seulawah Agam volcano estimated from 1D magnetotelluric

et al. 2022

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SeulawahAgam has planned to construct a geothermal power plant with an estimated 275 MW by the government to replace fossil energy. This study used a magnetotelluric (MT) survey to investigate the primary geothermal system, such as heat sources, reservoirs, or faults, which are responsible for regulating the surface manifestation. The regional volcano and fault of the Seulimum segments were traversed by 26 MT stations. The 1D Inversion was conducted toward the overall MT data using the Occam inversion algorithm from IP2Win MT. This Inversion was performed to acquire characteristics of the geothermal system based on resistivity parameters against the depth. The 1D model distribution was combined and converted into pseudo 2D, which could depict the subsurface conditions. Based on the data analysis, the cross-section model revealed that the volcanic sediment layer near the surface had a resistivity of 57–98 Ωm. In the depth of 4–8 km in profile one, and 0.2–2 km, in profile 2, coverage of clay cap rocks was found with impermeable properties, where the resistivity was low (<10 Ωm). Afterward, the reservoir layer was characterized by resistivity ranging from 94 to 188 Ωm located at 1–3 km depth, where this anomaly could be seen across all measuring tracks. Meanwhile, the region beneath the reservoir was estimated to be a heat source with a depth range of 2–5 km, as evidenced by a high resistivity of more than >1000 Ωm. The pseudo-2D results could provide an initial model of SeulawahAgam’s geothermal system.

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Section: D Cross-section From 1d Inversionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Geothermal reservoir depth of Seulawah Agam volcano estimated from 1D magnetotelluric

et al. 2022

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“…Additionally, both tracks also cross two craters which is the outcrop of the biggest manifestation from the volcanic activities of Seulawah Agam, with profile 1 crossing Cempaga crater and profile 2 crossing Heutz crater, so that the analysis carried out on the aforementioned profiles are capable of representing other areas in providing detailed information pertaining to the dimension of subsurface anomaly structure located at various depths. This dimensional analysis is required before the inversion [32], in which algorithms such as 1D and 2D are effective for structure mapping of the subsurface anomaly with the same dimension on the algorithm model [33]. Here, we combined the phase and ellipse data to ascertain the conductivity properties and the dimensional model of the anomaly, while we carried out the phase tensor analysis process using MTpy, a python toolbox for MT [58].…”

Section: Strike and Dimensionality Analysismentioning

confidence: 99%

“…In fact, a geothermal energy system is generally composed of a system of faults and fractures that generate geothermal fluid [3,20], with a high concentration of dissolved salts, resulting in a large presence of conductive electrolytes in the rock matrix. The conductivity of the fluid is highly temperature dependent, and geothermal systems are generally characterized by having higher conductivity than the host rock, making these systems ideal targets for electromagnetic (EM) measurement methods [31], especially magnetotellurics (MT)-based methods [32,33].…”

Section: Introductionmentioning

confidence: 99%

Mapping of Fault and Hydrothermal System beneath the Seulawah Volcano Inferred from a Magnetotellurics Structure

et al. 2021

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Magnetotellurics (MT) is an important geophysical method for exploring geothermal systems, with the Earth resistivity obtained from the MT method proving to be useful for the hydrothermal imaging changes of the system. In this research, we applied the MT method to map the geothermal system of the Seulawah Agam volcano in northern Sumatra, a site intended for the construction of a geothermal power plant with an estimated energy of 230 Mwe. Herein, 3D MT measurements were carried out, covering the entire area of the volcano and the various intersecting local faults from the Seulimeum segment in the NW–SE direction. Based on Occam 2D inversion, a conductive anomaly (<10 ohm·m) near the surface was identified in response to specific manifestation areas, including the Heutsz crater on the northern side and the Cempaga crater on the southern side. A further conductive anomaly was also found at a depth of 1 km, which was presumably due to a clay cap layer covering the fluid in the reservoir layer below the surface, where the manifestation areas are formed at various locations (where faults and fractures are found) owing to the fluid in the reservoir rising to the surface. The MT modeling also revealed that the reservoir layer in Seulawah Agam lies at a depth of 2 km with a higher resistivity of 40–150 ohm·m, which is the main target of geothermal energy exploration. At the same time, the heat source zone where magma is located was estimated to lie in two locations, namely, on the northern side centering on the Heutsz crater area and the southern side in the Cempaga crater area. A clear 3D structure obtained via Occam inversion was also used to visualize the hydrothermal flow in the Seulawah Agam volcano that originates from two heat source zones, where one structure that was consistent across all models is the conductive zone that reaches a depth of 5 km in the south in response to the regional faulting of the Seulimeum segment. Based on the MT research, we concluded that the volcano has the geothermal potential to be tapped into power plant energy in the future.

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“…From north to south, the various groups actively pursuing MT studies include WIHG, IITR, KUK, ISM(IIT), ISR, GERMI, IITB, IIGM, AU, OU, CSIR-NGRI. These groups have worked in different parts of India, e. g. IITR, KUK, CSIR-NGRI have worked in Himalayan region for deep crustal structure studies in Garhwal Himalaya and Sikkim Himalaya (Devi et al, , Israil et al 2016; Kumar et al, 2018b). CSIR-NGRI group has worked in Indo-Gangetic Plain (IGP) to delineate the basement depth geometry in Hamirpur-Rupadiah profile (Manglik et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Magnetotelluric investigations in India during last five years

Israil¹,

Kumar²,

Devi³

et al. 2020

PINSA

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This paper reviews the Magnetotelluric (MT) studies carried out in India during last five years. These MT field studies covered area, which includes Garhwal Himalaya, Sikkim Himalaya; Indo-Gangetic Plain (IGP); Gujrat, Dharwar craton (DC), Eastern Ghat Mobile Belt (EGMB), North Singhbhum Mobile Belt (NSMB), Dalma basalts, Dharwar region, Central Indian Shear (CIS) zone, Narmada-Son Lineament (NSL), Cuddapah basin, Banaganapalli quartzites, Narji limestone, Koyna-Warna and 3D MT inversion software-AP3DMT. The field investigations aimed to delineate deep crustal structure, the basement depth geometry, resistivity structure in the Bhuj earthquake region, electrical resistivity characterization of Fault zones, mapping of geothermal source zone, lithosphere architecture. Software, AP3DMT-MATLAB code for 3D inversion of MT data was developed and tested. This code is made versatile and user friendly by an efficient use of MATLAB's inbuilt functions.

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Magnetotelluric Investigations in Tuwa-Godhra Region, Gujarat (India)

Cited by 8 publications

References 27 publications

Geothermal reservoir depth of Seulawah Agam volcano estimated from 1D magnetotelluric

Geothermal reservoir depth of Seulawah Agam volcano estimated from 1D magnetotelluric

Mapping of Fault and Hydrothermal System beneath the Seulawah Volcano Inferred from a Magnetotellurics Structure

Magnetotelluric investigations in India during last five years

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