Hydrodynamic stagnation zones: A new play concept for the Llanos Basin, Colombia

Person, Mark; Butler, David; Gable, Carl W.; Villamil, Tomas; Wavrek, David A.; Schelling, Daniel

doi:10.1306/08101111019

Cited by 28 publications

(46 citation statements)

References 37 publications

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“…Continental ice sheets played an important role in the Quaternary hydrogeology of North America [ McIntosh and Walter , ; Neuzil , ; McIntosh et al ., ; Person et al ., ]. The Laurentide Ice Sheet retreat, initiated around 12,200 years ago, could be the main cause of stress‐induced changes and associated mechanical fracturing of the Becancour bedrock aquifer (Figure ).…”

Section: Resultsmentioning

confidence: 99%

Fracturing‐induced release of radiogenic ⁴He and ²³⁴U into groundwater during the last deglaciation: An alternative source to crustal helium fluxes in periglacial aquifers

Méjean

Pinti

Ghaleb

et al. 2017

Water Resources Research

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External 4He sources have been invoked to explain 4He concentrations in groundwater greater than those expected from in situ U and Th production. In a fractured aquifer of Ordovician age located in the St. Lawrence Lowlands (Quebec, Canada), 4He concentrations of up to 4.48 × 10−5 cm3 STP gnormalH2O−1 were measured. Such concentrations are ∼1000 times higher than would be expected from in situ production. A concomitant increase in 4He concentration and 234U/238U activity ratio is shown, suggesting a common release process in groundwater for 234U and 4He. This process has tentatively been identified as glaciation‐induced rock fracturing following the Laurentide Ice Sheet retreat. The resulting increase in exposed grain surface facilitates 234U release by α‐recoil and that of radiogenic 4He by diffusion. Using a model of helium diffusion from a spherical grain, it is shown that rock fracturing facilitated the release of accumulated 4He at rates ranging from 4.2 × 10−10 to 1.06 × 10−8 cm3 STP gnormalH2O−1 yr−1. These release rates are between 1000 and 30,000 times higher than the local U and Th steady state production rate, of 3.5 ± 1.4 × 10−13 cm3 STP grock−1 yr−1. Integration of 4He release rates over time yields a radiogenic 4He concentration of between 3.85 × 10−6 and 7.12 × 10−5 cm3 STP gnormalH2O−1, in the range of concentrations measured in the St. Lawrence Lowlands fractured aquifers. Results support the occurrence of a local radiogenic helium source to explain the excesses measured in groundwater without requiring a significant external He crustal flux.

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Section: Resultsmentioning

confidence: 99%

Fracturing‐induced release of radiogenic ⁴He and ²³⁴U into groundwater during the last deglaciation: An alternative source to crustal helium fluxes in periglacial aquifers

Méjean

Pinti

Ghaleb

et al. 2017

Water Resources Research

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“…; Person et al . ). Fresh and brackish formation waters of shallow and cool reservoirs (<70°C) are generally characterized by a bicarbonate‐dominated composition, with stable isotope ratios shifted away from the meteoric line.…”

Section: Discussionmentioning

confidence: 97%

“…; Person et al . ). The marine, coastal, and deltaic deposits of the Une, Gacheta, and Carbonera fms were initially influenced by sea water (salinity reference values: 32 000–35 000 mg l −1 ), but currently host fresh waters with low salinity values.…”

Section: Previous Studiesmentioning

confidence: 97%

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Origins of formation waters in the Llanos foreland basin of Colombia: geochemical variation and fluid flow history

et al. 2014

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Wells located in the Colombian Andean foreland often produce biodegraded hydrocarbons and relatively fresh water (total dissolved solids concentrations of 2000 mg l−1 dominate across most of the basin). The ratio of water to hydrocarbon in the produced fluids is high and has often been interpreted by explorationists and simulation engineers as being due to massive meteoric water invasion. To challenge this hypothesis, previously published and existing data are compiled here, along with 68 new water samples collected from both the surface (rivers) and subsurface (production wells), which are analyzed for major elements, salinity, and stable isotope compositions. The data indicate a mixed origin for the water, which involves formation water, meteoric water, and a third source that we interpret as being related to diagenetic processes (such as clay dehydration). Analyses of the variation of the parameters from north to south and west to east allow us to define the mixtures as coming from waters of different origins and make it possible to determine the relative contribution of each source.

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“…An et al, 2015), accumulation of petroleum and ore deposits (e.g. Person et al, 2012) as well as eco-hydrological conditions (e.g. Batelaan et al, 2003) and surface water-groundwater interaction (e.g.…”

Section: Introduction and Aimsmentioning

confidence: 99%

Groundwater flow pattern and related environmental phenomena in complex geologic setting based on integrated model construction

Tóth

Havril

Simon

et al. 2016

Journal of Hydrology

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Hydrodynamic stagnation zones: A new play concept for the Llanos Basin, Colombia

Cited by 28 publications

References 37 publications

Fracturing‐induced release of radiogenic ⁴He and ²³⁴U into groundwater during the last deglaciation: An alternative source to crustal helium fluxes in periglacial aquifers

Fracturing‐induced release of radiogenic ⁴He and ²³⁴U into groundwater during the last deglaciation: An alternative source to crustal helium fluxes in periglacial aquifers

Origins of formation waters in the Llanos foreland basin of Colombia: geochemical variation and fluid flow history

Groundwater flow pattern and related environmental phenomena in complex geologic setting based on integrated model construction

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Hydrodynamic stagnation zones: A new play concept for the Llanos Basin, Colombia

Cited by 28 publications

References 37 publications

Fracturing‐induced release of radiogenic 4He and 234U into groundwater during the last deglaciation: An alternative source to crustal helium fluxes in periglacial aquifers

Fracturing‐induced release of radiogenic 4He and 234U into groundwater during the last deglaciation: An alternative source to crustal helium fluxes in periglacial aquifers

Origins of formation waters in the Llanos foreland basin of Colombia: geochemical variation and fluid flow history

Groundwater flow pattern and related environmental phenomena in complex geologic setting based on integrated model construction

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Fracturing‐induced release of radiogenic ⁴He and ²³⁴U into groundwater during the last deglaciation: An alternative source to crustal helium fluxes in periglacial aquifers

Fracturing‐induced release of radiogenic ⁴He and ²³⁴U into groundwater during the last deglaciation: An alternative source to crustal helium fluxes in periglacial aquifers