Indications of regional scale groundwater flows in the Amazon Basins: Inferences from results of geothermal studies

Pimentel, Elizabeth Tavares; Hamza, Valiya M.

doi:10.1016/j.jsames.2012.03.007

Cited by 13 publications

(8 citation statements)

References 39 publications

(44 reference statements)

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“…During periods of low level sea stand the sedimentary layers in coastal areas harbour significant recharge movements of groundwater, originating from fluvial discharge and associated subsurface flow systems. Much of these are in fact similar to the underground flow systems described in the recent works of Pimentel and Hamza (2012;2013). On the other hand, during periods of high level sea stand the connection between fluvial discharge and sedimentary layers in the continental shelf are cut off.…”

Section: Discussionsupporting

confidence: 69%

“…In Brazil such flows have been identified in the Amazon, Parnaiba and Paraná basins (Pimentel and Hamza, 2013). Pimentel and Hamza (2012) reported subsurface flows in the Taubate basin and in the on-shore segment of the Campos basin. In this latter case there are indications of subsurface discharge into the submerged parts of the continental shelf.…”

Section: Introductionmentioning

confidence: 97%

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Determination of fluid flow in Deep Sedimentary Layers in the Campos Basin

Pimente¹,

Hamza²

2014

Proceedings of the 6 Simpósio Brasileiro De Geofísica

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Results of regional-scale geothermal studies are presented, providing new insights into the characteristics of fluid flows within deep sedimentary layers of the Campos basin. The study is based on bottom-hole temperature data sets for 76 oil wells, the depths of which vary from 2000 to 4000 m. The techniques employed in data analysis have allowed identification of upflow of fluids in both shallow and deep sedimentary layers. Specifically, temperature profiles of 15 wells are found to have non-linear features indicative of upflow. The geographic distributions of these wells indicate presence of two distinct groups of flow systems that operate in shallow and deep depositional environments. According to the results obtained vertical velocities of fluid flows are found to fall in the range 10 -10 to 10 -9 m/s, while the horizontal velocities are considerably higher, of the order 10 -8 m/s.

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Section: Discussionsupporting

confidence: 69%

Section: Introductionmentioning

confidence: 97%

Determination of fluid flow in Deep Sedimentary Layers in the Campos Basin

Pimente¹,

Hamza²

2014

Proceedings of the 6 Simpósio Brasileiro De Geofísica

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“…Hence no attempts were made in presenting forward model results for these remaining wells. Log data for some wells reported in the work of Pimentel and Hamza (2012) have features indicative of down flow of groundwater at shallow depths. These were also considered as unsuitable for climate studies of the present work.…”

Section: Forward Model Resultsmentioning

confidence: 95%

“…A summary of long-term changes in the southern and eastern parts reveals a gradual cooling trend over the last several centuries, with magnitudes varying not more than 2 o C. Another notable trend are indications of an increase of 1 to 3 o C in GST variation since 1850. More recently, climate change events in the Amazon region have been studied in some detail (Araujo, 1999;Oliveira et al, 2006;Hamza, 2007;Pimentel and Hamza, 2012). In the present work, we examine features in temperature logs of boreholes in the western parts of Amazon region indicative of past climate changes.…”

Section: Introductionmentioning

confidence: 94%

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Inversion results appended with estimates from vegetation changes in assessment of Ground Surface Temperatures for the Amazon Region, Brazil

Hamza

Vieira

Guimarães

et al. 2021

ijthfa

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Estimates have been made of ground surface temperature (GST) variations for 25 localities in the region of Manaus (province of Amazon in Brazil) making use of both forward and inverse models. The work is based on analysis of borehole temperature logs as well as remote sensing data concerning changes in vegetation cover. Results of functional space inversion (FSI) of borehole temperature data reveal the occurrence of a cooling event, with a decrease in temperature of slightly less than 1oC, for the period of 1600 to 1850 AD. This episode coincides roughly with the period of “little ice age” in the southern hemisphere. It was followed by a warming event, with magnitudes varying from 2 to 3oC, that lasted until recent times. Integration of these results with estimates based on changes in normalized index of vegetation cover (NVDI) of the last decade points to continuation of climate warming over the last decade. This event is found to be prominent in areas of deforestation in central parts of the Amazon region.

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

Pimentel

Hamza

2013

Hydrogeol J

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Indications of regional scale groundwater flows in the Amazon Basins: Inferences from results of geothermal studies

Cited by 13 publications

References 39 publications

Determination of fluid flow in Deep Sedimentary Layers in the Campos Basin

Determination of fluid flow in Deep Sedimentary Layers in the Campos Basin

Inversion results appended with estimates from vegetation changes in assessment of Ground Surface Temperatures for the Amazon Region, Brazil

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

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