Hydraulic properties and scale effects investigation in regional rock aquifers, south-western Quebec, Canada

Nastev, Miroslav; Savard, Martine M.; Lapcevic, P. A.; Lefebvre, René; Martel, Richard

doi:10.1007/s10040-004-0340-6

Cited by 36 publications

(32 citation statements)

References 13 publications

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“…V nadaljevanju so bili koeficienti prepustnosti iz poro~il primerjani z novo izra~-unanimi vrednostmi po BARKERJEVI ( pripisala tehni~nim lastnostim izvedbe vrtin, ~asu ~rpanja in metodi preizkusov, saj so bili nekateri testi nalivalni, drugi pa ~rpalni. Kon~ni rezultati so torej po njunih ugotovitvah odvisni od izbire metode, razen tega pa na dobljene vrednosti deloma vplivata tudi izbira merila opazovanja in nain izvedbe poizkusov (NASTEV et al, 2004). Rezultati primerjave koeficientov prepustnosti (tab.…”

Section: Primerjava Koeficientov Prepustnosti Pridobljenih Po Razli~unclassified

Hydraulic conductivities of fractures and matrix in Slovenian carbonate aquifers

Verbovšek¹

2008

Geologija

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Izvle~ekV prispevku so s fraktalno Barkerjevo metodo analize ~rpalnih poizkusov dolo~ene vrednosti koeficientov prepustnosti in koeficientov elasti~nega uskladi{~enja tako za razpoke in za matriks v slovenskih karbonatnih vodonosnikih, predvsem v dolomitih. Vrednosti so podane za dolomite in apnence skupaj, kot tudi za posamezne vodonosnike, lo~ene po starostih kamnin in po litolo{kih zna~ilnostih. Podatki so zbrani iz poro~il o 397-ih vrtinah in vodnjakih, z omenjeno metodo pa je reinterpretiranih 79 ~rpalnih poizkusov. Koeficienti prepustnosti razpok so bistveno vi{ji od koeficientov prepustnosti matriksa, statisti~ne razlike med njimi pa so visoko zna~ilne. Podobno so zna~ilne tudi razlike med koeficienti elasti~nega uskladi{~enja v razpokah in v matriksu, pri ~emer so vrednosti v slednjem ve~je. Vrednosti vseh koeficientov se razlikujejo v posameznih vodonosnikih, razlike pa se da razložiti z diagenetskimi zna~ilnostmi, velikostjo zrn, stopnjo razpokanosti in ~istostjo kamnin. Primerjava med metodami, uporabljenimi v poro~ilih, in Barkerjevo metodo, kaže, da se podatki bolje prilegajo slednji metodi, ki je za kra{ko-razpoklinski tip kamnin tudi bolj ustrezna. AbstractHydraulic conductivities and specific storage coefficients of fractures and matrix in Slovenian carbonate aquifers were determined by Barker's method for pumping test analysis, based on fractional flow dimension. Values are presented for limestones and mainly for dolomites, and additionally for separate aquifers, divided by age and lithology in several groups. Data was obtained from hydrogeological reports for 397 water wells, and among these, 79 pumping tests were reinterpreted. Hydraulic conductivities of fractures are higher than the hydraulic conductivities of matrix, and the differences are highly statistically significant. Likewise, differences are significant for specific storage, and the values of these coefficients are higher in the matrix. Values of all coefficients vary in separate aquifers, and the differences can be explained by diagenetic effects, crystal size, degree of fracturing, and carbonate purity. Comparison of the methods, used in the reports, and the Barker's method (being more suitable for karstic and fractured aquifers), shows that the latter fits real data better. UvodV Sloveniji je delež odvzema podzemne vode proti razpoložljivi koli~ini v vodnih telesih podzemne vode s prevladujo~imi vodonosniki kra{kega, razpoklinskega in me{anega tipa poroznosti {e vedno majhen (povpre~no 12 %; ANDJELOV et al., 2006). Kljub dokaj majhnem deležu postajajo ti vodonosniki ~edalje pomembnej{i vir pitne vode. V primerjavi z medzrnskimi so {e vedno manj raziskani, predvsem zaradi svoje heterogenosti in posledi~no zahtevnej{ih analiz, zato je o njih znanih manj podatkov, med katere npr. sodijo podatki o prepustnosti oz. izdatnosti. V Sloveniji se veliko raziskovalcev ukvarja z razli~nimi lastnostmi karbonatnih kamnin, toda sistemati-~n ih analiz parametrov in predvsem analiz, ki bi povezovale vrednosti parametrov z dejanskimi lastnostmi ka...

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Section: Primerjava Koeficientov Prepustnosti Pridobljenih Po Razli~unclassified

Hydraulic conductivities of fractures and matrix in Slovenian carbonate aquifers

Verbovšek¹

2008

Geologija

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“…Chiarenzelli et al [13] analyzed the inorganic geochemistry of 154 well water samples from private wells on the St. Regis Mohawk Nation (Akwesasne) located to the northeast in Franklin County, adjacent to St. Lawrence County. Part of the St. Lawrence Lowlands Physiographic Province, the Ogdensburg dolostone is the prominent aquifer in the region [13][14][15][16]. In the study elevated concentrations of As, Fe, Hg, and Pb were noted at one site while Al, Mn, and TDS were found at elevated concentrations at 3, 19, and 24 sampling locations respectively and were determined to be primarily associated with shallower wells [11].…”

Section: Introductionmentioning

confidence: 99%

“…Hydrogeology-Relatively little information on the hydrogeology of St. Lawrence County or adjacent areas exists in the literature [14][15][16]. Aside from overlying glacial deposits, the bedrock consists of rocks of Precambrian to Ordovician age which, in general, lack significant primary porosity and permeability.…”

Section: Introductionmentioning

confidence: 99%

“…Even the Potsdam sandstone is thoroughly indurated with optically continuous quartz overgrowths that seal off all pore space. Carbonate rocks including Precambrian marbles and Phanerozoic limestones and dolostones have significant amounts of dissolution porosity and tend to be the most prolific bedrock aquifers in the region [14]. Based significant local relief, complex folding and faulting, and the large amount of surface water (streams, rivers, lakes, bogs, swamps, marshes, etc.)…”

Section: Introductionmentioning

confidence: 99%

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Multi-Element Analysis and Geochemical Spatial Trends of Groundwater in Rural Northern New York

O’Connor

Zabik

Cady

et al. 2010

Water

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Samples from private wells (n = 169) throughout St. Lawrence County, NY were analyzed by ICP-MS multi-element techniques. St. Lawrence County spans three diverse bedrock terranes including Precambrian crystalline rocks of the Adirondack Lowlands (mostly paragneisses) and Highlands (mostly orthogneisses), as well as Paleozoic sedimentary rocks of the St. Lawrence Valley. An ArcGIS database was constructed and used to generate contour plots for elements across the county. Strontium isotopes and unique geochemical signatures were used to distinguish water from various geologic units. The results were consistent with a large (7,309 km 2 ), sparsely populated (~110,000), rural region with diverse bedrock and glacial cover.

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“…In the Canadian context of this study, examples dealing with aquifer heterogeneity have been provided for both granular [4] and fractured [5] matrices. Nastev et al [6] described the lognormal decrease of hydraulic conductivities with depth in postglacial fractured bedrock in Quebec, Canada. Recent regional groundwater characterizations, also carried out in Quebec, between 2008 and 2015, included the investigation of vertical bedrock fracturing patterns.…”

Section: Introductionmentioning

confidence: 99%

High-Resolution Wellbore Temperature Logging Combined with a Borehole-Scale Heat Budget: Conceptual and Analytical Approaches to Characterize Hydraulically Active Fractures and Groundwater Origin

et al. 2018

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This work aims to provide an overview of the thermal processes that shape wellbore temperature profiles under static and dynamic conditions. Understanding of the respective influences of advection and conduction heat fluxes is improved through the use of a new heat budget at the borehole scale. Keeping in mind the thermal processes involved, a qualitative interpretation of the temperature profiles allows the occurrence, the position, and the origin of groundwater flowing into wellbores from hydraulically active fractures to be constrained. With the use of a heat budget developed at the borehole scale, temperature logging efficiency has been quantitatively enhanced and allows inflow temperatures to be calculated through the simultaneous use of a flowmeter. Under certain hydraulic or pumping conditions, both inflow intensities and associated temperatures can also be directly modelled from temperature data and the use of the heat budget. Theoretical and applied examples of the heat budget application are provided. Applied examples are shown using high-resolution temperature logging, spinner flow metering, and televiewing for three wells installed in fractured bedrock aquifers in the St-Lawrence Lowlands, Quebec, Canada. Through relatively rapid manipulations, thermal measurements in such cases can be used to detect the intervals or discrete positions of hydraulically active fractures in wellbores, as well as the existence of ambient flows with a high degree of sensitivity, even at very low flows. Heat budget calculations at the borehole scale during pumping indicate that heat advection fluxes rapidly dominate over heat conduction fluxes with the borehole wall. The full characterization of inflow intensities provides information about the distribution of hydraulic properties with depth. The full knowledge of inflow temperatures indicates horizons that are drained from within the aquifer, providing advantageous information on the depth from which groundwater originates during pumping.

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Hydraulic properties and scale effects investigation in regional rock aquifers, south-western Quebec, Canada

Cited by 36 publications

References 13 publications

Hydraulic conductivities of fractures and matrix in Slovenian carbonate aquifers

Hydraulic conductivities of fractures and matrix in Slovenian carbonate aquifers

Multi-Element Analysis and Geochemical Spatial Trends of Groundwater in Rural Northern New York

High-Resolution Wellbore Temperature Logging Combined with a Borehole-Scale Heat Budget: Conceptual and Analytical Approaches to Characterize Hydraulically Active Fractures and Groundwater Origin

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