Use of geothermal methods in outlining deep groundwater flow systems in Paleozoic interior basins of Brazil

Pimentel, Elizabeth Tavares; Hamza, Valiya M.

doi:10.1007/s10040-013-1074-0

Cited by 14 publications

(7 citation statements)

References 53 publications

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“…Its variation with depth allows the use of curvematching methods for determination of the flow parameter and the quantity (= / ). These results in turn may be used for determination of the velocity components, as pointed out by [50] and more recently by [51].…”

Section: Vertical Distribution Of Temperatures Vertical Distributionmentioning

confidence: 92%

Heat Flow in the Campos Sedimentary Basin and Thermal History of the Continental Margin of Southeast Brazil

Cardoso

Hamza

2014

ISRN Geophysics

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Bottom-hole temperatures and physical properties derived from geophysical logs of deep oil wells have been employed in assessment of the geothermal field of the Campos basin, situated in the continental margin of southeast Brazil. The results indicate geothermal gradients in the range of 24 to 41°C/km and crustal heat flow in the range of 30 to 100 mW/m2within the study area. Maps of the regional distributions of these parameters point to arc-shaped northeast-southwest trending belts of relatively high gradients and heat flow in the central part of the Campos basin. This anomalous geothermal belt is coincident with the areas of occurrences of oil deposits. The present study also reports progress obtained in reconstructing the subsidence history of sedimentary strata at six localities within the Campos basin. The results point to episodes of crustal extension with magnitudes of 1.3 to 2, while extensions of subcrustal layers are in the range of 2 to 3. Thermal models indicate high heat flow during the initial stages of basin evolution. Maturation indices point to depths of oil generation greater than 3 km. The age of peak oil generation, allowing for variable time scales for cooling of the extended lithosphere, is found to be less than 40 Ma.

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Section: Vertical Distribution Of Temperatures Vertical Distributionmentioning

confidence: 92%

Heat Flow in the Campos Sedimentary Basin and Thermal History of the Continental Margin of Southeast Brazil

Cardoso

Hamza

2014

ISRN Geophysics

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“…Signs of regional climate change may be, however, overshadowed by changes in anthropogenic activity that affect land use or vegetation patterns. For that reason, other possible sources of temperature perturbations must be considered (Cermak and Bodri, 2018;Demetrescu and Shimamura, 1997;Middleton, 1999;Pimentel and Hamza, 2013;Prensky, 1992).…”

Section: The Analytical Heat Conduction Modelmentioning

confidence: 99%

Short- and long-term variations in groundwater temperature caused by changes in vegetation cover

Pinheiro

Buntebarth

Polle

et al. 2021

ijthfa

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Several comparative studies of the earth's surface provide evidence that vegetation and other bio-physical processes at the earth's surface can directly affect the atmospheric boundary layer, leading to changes in temperature and precipitation patterns. In this study, we demonstrate how vegetation cover can be responsible for the subsurface temperature variation as well as how this temperature variation can be related to past events. A linear decrease of 0.0407 K/year was estimated, and a decrease of 2 mK was observed in subsurface temperature when the surface temperature exceeded 9 oC. This diurnal temperature variation occurs during the phenological growing season of the vegetation. The transient temperature shows an annual cycle at a depth of 40 m. Model calculation applying a linear decrease in surface temperature of 2 K as a boundary condition was simulated. Comparing the results with the trend it is realistic to assume that when an apparent thermal diffusivity of 1.8*10-6 m²/s is applied an event starting between 10 and 20 years ago is responsible for the detected decrease in temperature. However, with this thermal diffusivity the conductive annual temperature variation reaches an amplitude of 1.1 mK instead of the measured 5.4 mK at 40 m. In conclusion, beside the vegetation causing additional convective heat transport triggered by the annual surface temperature, the influence of reduced solar incoming heat radiation reaching the ground caused by the increased shadowing effect of vegetation cover might be responsible for a continuous decrease in local temperature of 2 K being active approximately 20 years after plantation.

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“…This procedure reveals the presence of vertical distributions of temperature, characterized by sharp changes at shallow depths. Such features in vertical distributions of temperatures have been interpreted by Pimentel and Hamza (2014) and Vieira et al (2014) as indicative of down flow of groundwater at shallow depths. Studies of the thermal structure at shallow depths are important in understanding the nature of deep flow systems.…”

Section: Temperatures and Geothermal Gradientsmentioning

confidence: 99%

“…Intermediate values occur in the remaining regions. Pimentel and Hamza (2014) and Vieira et al (2014) have argued that low geothermal gradients are associated with regions of significant down flows of groundwater in deeper strata.…”

Section: Temperatures and Geothermal Gradientsmentioning

confidence: 99%

Deep-seated Geothermal Resources of the Parana Basin

Gomes¹,

Gomes²

2018

ijthfa

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Updated data sets on terrestrial heat flow and thermal springs have been employed in outlining the nature of deep-seated geothermal resources of the Parana basin. A 1 o x1 o grid system was adopted for data processing and in determinations of vertical distributions of excess temperatures. The results obtained have led to an improved understanding of the occurrence of high temperature geothermal resources and allowed estimates of associated resource base. It has been possible to identify more than 20 crustal blocks where the resource base per unit area, referred to the accessible depth limit of 6 km, are in the range of 2x10 11 to 9x10 11 Joules. There are indications pointing to occurrence of medium temperature geothermal resources at depths of 4 to 6 km in several sectors of the central and western parts of the basin. The area extent of such blocks has dimensions of several tens of kilometers. Most high temperature resources occur within the well-known sectors of fault-controlled magmatic activity associated with the eruption of Serra Geral flood basalts. In addition, isolated pockets of high enthalpy geothermal resources are found to be present along the northwestern border. The results have also allowed better assessments of low temperature resources of the Guarani aquifer system, which span over large areas of southern Brazil, western Uruguay and northern Argentina.

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Use of geothermal methods in outlining deep groundwater flow systems in Paleozoic interior basins of Brazil

Cited by 14 publications

References 53 publications

Heat Flow in the Campos Sedimentary Basin and Thermal History of the Continental Margin of Southeast Brazil

Heat Flow in the Campos Sedimentary Basin and Thermal History of the Continental Margin of Southeast Brazil

Short- and long-term variations in groundwater temperature caused by changes in vegetation cover

Deep-seated Geothermal Resources of the Parana Basin

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