Magnetotelluric Studies for Hydrocarbon and Geothermal Resources: Examples from the Asian Region

Patro, Prasanta K.

doi:10.1007/s10712-017-9439-x

Cited by 51 publications

(17 citation statements)

References 68 publications

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“…Later, the MT studies brought out the presence of a thin sediments towards south and thick sediments towards northwestern part of the Saurashtra. Subsequently the deep drilling (3.5 km) carried out at Lodhika which validated the findings from MT studies (Harinarayana, 2008;Patro, 2017).…”

Section: Mt Studies In the Deccan Trap Regionsupporting

confidence: 72%

“…These studies as an off shoot bring out the potential showing the scope and prospective of the MT studies in hydrocarbon, geothermal exploration, resource location, seismogenesis etc. Some details of these applied studies can be found in the research publications (Sarma et al, 1983;Gupta et al, 1996;Bhattacharya et al, 2003;Sarma et al, 2004;Harinarayana et al, 2006a;Satpal et al, 2006;Pandey et al, 2009;Sinharay et al, 2010;Rawat et al, 2014;Patro et al, 2015;Sircar et al, 2015;Arora et al, 2017;Mohan et al, 2017;Patro, 2017). Therefore, case studies Article presented here are carefully selected to highlight the allied applications.…”

Section: Introductionmentioning

confidence: 99%

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Electrical conductivity structure along a few transects over the Indian Lithospheric domains

Patro

2020

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Section: Mt Studies In the Deccan Trap Regionsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Electrical conductivity structure along a few transects over the Indian Lithospheric domains

Patro

2020

Episodes

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“…A complete geothermal system has four elements: a heat source, a thermal reservoir, a thermal channel, and a cap layer [7]. The Huailai area has developed fault systems and good thermal channel conditions (Figure 1).…”

Section: Analysis Of Deep Geothermal Elementsmentioning

confidence: 99%

“…Heat sources can be divided into magmatic and non-magmatic types [7]. From the structure revealed by the magnetotelluric profile, there is a high-conductivity C1 structure under the basement of the Huailai Basin, which appears as a bright spot reflector in the seismic reflection.…”

Section: The Formation Of the Heat Sourcementioning

confidence: 99%

“…2021, 11, 2086 2 of 14 thermal reservoirs to form hot water. Non-magmatic geothermal systems are different in structure and composition [7]. According to hydrogeological surveys, most geothermal water in the Huailai area is mainly distributed in bedrock and the overlying strata, and there are clay and calcareous cements in the upper caprock [8], which conforms to the shallow characteristics of the magmatic geothermal type.…”

Section: Introductionmentioning

confidence: 99%

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Magmatic Geothermal Genesis Model in the Huailai Area Based on the Constraints of the Crust–Mantle-Scale Geoelectric Structure

et al. 2021

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The Huailai area is rich in geothermal resources, but the formation mechanism of its deep heat source is still unclear. In this paper, based on 16 broadband magnetotelluric sounding points, the two-dimensional electrical structure of the crust and mantle in the Huailai area was obtained. Combined with deep seismic reflection and P-wave seismic tomography, the geophysical characteristics of deep heat sources and reservoirs in the Huailai area are described. The Huailai area is characterized by low resistivity and layered reflection above 2 km in depth, which shows the distribution of the Cenozoic sedimentary cover layer. The upper crust is characterized by high resistivity without an obvious reflector, corresponding to the crystalline basement of the basin, whose main lithology is Archean gneiss. There is a highly conductive and bright-spot-reflective structure under the basement, which extends to 100 km, indicating the upwelling of mantle-derived material. Combined with the results of helium isotope tracing, a magma-type geothermal model in the Huailai area is proposed. The upwelling mantle-derived magma material is enriched under the basement to form a heat source. The heat is transferred to the upper crust through heat conduction along the crystalline basement. Then, groundwater circulation brings deep heat to the surface, forming hydrothermal resources.

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Robust inversion of 1D magnetotelluric data using the Huber loss function

Desifatma,

Djaja,

Pratomo

et al. 2024

Comput Geosci

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In this study, a robust 1D inversion was performed on magnetotelluric (MT) data by utilizing the Huber loss function to avoid misleading interpretation of results, which is caused by the presence of outliers in the data. The MT method utilizes the ratio between the electric field (E) and the magnetic field (H), which are perpendicular to each other, to obtain impedance values (Z). These values are used to extract subsurface information in the form of electrical resistivity variations with depth. In the study, forward modeling of the 1D MT responses was conducted by recursively calculating Z values. Robust inversion was performed using the Huber loss function as an objective function to minimize the difference between the calculated and observed data. The Huber loss function combines the squared loss and the absolute loss to anticipate the presence of outliers in MT observation data. The robust inversion was performed on synthetic data with additional noise and field data. The inversion process utilized 50 layers with a thickness of 500 m, a hyperparameter $$\varvec{\delta }= 5\times {10}^{-2}$$ δ = 5 × 10 - 2 , $$\lambda =0.01$$ λ = 0.01 , and $${\lambda }_{t}=100$$ λ t = 100 . The number of iterations used was 500 for inversions that used synthetic data and 3000 for inversions that used field data. The robust inversion scheme using the Huber loss function successfully overcame the presence of outliers and accurately estimated the actual model parameters, both for synthetic data and field data that contained outliers. The misfit was relatively small and close to zero, indicating that the inversion code works well.

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Magnetotelluric Studies for Hydrocarbon and Geothermal Resources: Examples from the Asian Region

Cited by 51 publications

References 68 publications

Electrical conductivity structure along a few transects over the Indian Lithospheric domains

Electrical conductivity structure along a few transects over the Indian Lithospheric domains

Magmatic Geothermal Genesis Model in the Huailai Area Based on the Constraints of the Crust–Mantle-Scale Geoelectric Structure

Robust inversion of 1D magnetotelluric data using the Huber loss function

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