NDLI: Single-well and large-scale cross-hole tracer experiments in fractured rocks at two sites in Sweden

Content Provider	Springer Nature Link
Author	rdqvist, Rune Hjerne, Calle Andersson, Peter
Copyright Year	2011
Abstract	As part of the Swedish site investigations and research associated with the disposal of spent nuclear fuel, tracer experiments in deep boreholes have been employed in order to characterize solute transport and hydraulic connectivity in the fractured bedrock at two sites—Forsmark and Laxemar-Simpevarp. Performance and analytical results are presented from a suite of tracer experiments in varying scales, from single-hole injection-withdrawal tests, intermediate-scale tests with sorbing tracers, to large-scale connectivity tests over distances up to several hundred meters in major fracture zones or networks of zones. In addition to demonstrating transport connectivity over large distances, a general result is that the single-hole tests, as well as the cross-hole tests with sorbing tracers, have clearly demonstrated the process of solute retention of water-conductive features in the rock at different scales.En tant que participation à la recherché et à l’étude du site suédois destiné au stockage de combustible nucléaire usagé, des essais de traçage par forages profonds ont été réalisés afin de caractériser le transport de soluté et la conductivité hydraulique du socle fracturé de deux sites—Forsmark et Laxemar-Simpevarp. Mise en œuvre et résultats analytiques sont présentés à la suite d’une série de traçage à différentes échelles, depuis les tests d’injection-prélèvement sur puits singulier, tests à échelle intermédiaire avec traceurs adsorbables, jusqu’aux tests de conductivité sur des distances atteignant plusieurs centaines de mètres dans des zones à fracturation majeure ou en réseaux. En plus de la mise en évidence de la conductivité hydraulique sur de longues distances, un résultat général est que les tests sur puits singulier, comme les tests sur puits croisés avec traceurs adsorbants, ont clairement démontré le processus de rétention du soluté dans les structures conductrices de la roche à différentes échelles.Como parte de estudios suecos locales y la investigación asociada con la disposición de combustible nuclear utilizado, se han empleado experimentos de trazadores en pozos profundos con el fin de caracterizar el transporte de soluto y la conectividad hidráulica en el basamento fracturado en dos sitios—Forsmark and Laxemar-Simpevarp. Se presentan los rendimientos y los resultados analíticas a partir de un conjunto de experimentos de trazadores a escalas variables, desde ensayos en pozos simples de inyección y extracción, ensayos a escala intermedia con trazadores de sorción, hasta pruebas de conectividad a gran escala sobre distancias de varios cientos de metros en zonas de fracturas mayores o redes de zonas. Además de demostrar la conectividad del transporte sobre grandes distancias, un resultado general es que los ensayos en un pozo simple, así como en los ensayos entre perforaciones con trazadores de sorción, han demostrado claramente los procesos de retención de solutos en las características conductivas del agua en la roca a diferentes escalas.作为与核废物处置有关的瑞典场地调查和研究的一部分,在Forsmark 和Laxemar-Simpevarp两个试验点开展了裂隙岩体深孔中示踪试验以刻画溶质运移和水力传导度。采用了一系列多尺度示踪试验并提出分析结果,包括从单孔注入-抽出试验,中等尺度吸附示踪剂试验,到主要裂隙区或者裂隙网络区大至数百米的大尺度连通性试验。除了要证明较长距离上的运移连通性,普遍意义上的结果表明单井试验以及利用吸附示踪剂的跨孔试验可以清楚的证明在不同尺度上岩石中溶质滞留导水特征的过程。Como parte integrante das investigações associadas à deposição de resíduos de combustível nuclear na Suécia, foram realizados ensaios com traçadores em furos profundos, de forma a caraterizar o transporte de soluto e a conetividade hidráulica no substrato rochoso fraturado em dois locais—Forsmark e Laxemar-Simpevarp. Os resultados analíticos e de desempenho são apresentados a partir de um conjunto de ensaios com traçadores realizados a escalas variáveis, desde um único furo de injeção e extração, passando por uma escala intermédia com traçadores absorventes, até testes de conetividade em larga escala efetuados em vários furos a distâncias até centenas de metros, em zonas de fraturas principais ou redes de fraturas. Além de demonstrar a conetividade do transporte a grandes distâncias, o resultado geral dos testes realizados mostra que, quer no caso do único furo de injeção e extração, quer nos testes efetuados em vários furos com traçadores absorventes, se demonstra claramente o processo de retenção de solutos da água nas fraturas condutivas da rocha, e nas diferentes escalas.
Starting Page	519
Ending Page	531
Page Count	13
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	20
Issue Number	3
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2012-01-05
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tracer tests Fractured rocks Nuclear repository Sweden Hydrogeology Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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