Stochastic continuum modeling of flow and transport in a crystalline rock mass: Fanay-Aug�res, France, revisited

Ando, Kenichi; Kostner, Albert; Neuman, Shlomo P.

doi:10.1007/s10040-003-0286-0

Cited by 56 publications

(53 citation statements)

References 12 publications

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“…More fundamentally, some scientists question the utility of these models and claim that continuous Geostatistical models can manage just as well as discontinuous Boolean ones (e.g. Anda et al 2003), but the authors of the present paper strongly disagree. Boolean models have made an extremely valuable contribution in dealing with heterogeneity by introducing the facies concept and addressing the connectivity issue.…”

Section: Stochastic Shalesmentioning

confidence: 79%

Dealing with spatial heterogeneity

et al. 2005

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Heterogeneity can be dealt with by defining homogeneous equivalent properties, known as averaging, or by trying to describe the spatial variability of the rock properties from geologic observations and local measurements. The techniques available for these descriptions are mostly continuous Geostatistical models, or discontinuous facies models such as the Boolean, Indicator or Gaussian-Threshold models and the Markov chain model. These facies models are better suited to treating issues of rock strata connectivity, e.g. buried high permeability channels or low permeability barriers, which greatly affect flow and, above all, transport in aquifers. Genetic models provide new ways to incorporate more geology into the facies description, an approach that has been well developed in the oil industry, but not enough in hydrogeology. The conclusion is that future work should be focused on improving the facies models, comparing them, and designing new in situ testing procedures (including geophysics) that would help identify the facies geometry and properties. A world-wide catalog of aquifer facies geometry and properties, which could combine site genesis and description with methods used to assess the system, would be of great value for practical applications.RØsumØ On peut aborder le problme de l'hØtØrogØnØitØ en s'efforçant de dØfinir une permØabilitØ Øquivalente homogne, par prise de moyenne, ou au contraire en dØ-crivant la variation dans l'espace des propriØtØs des roches à partir des observations gØologiques et des mesures locales. Les techniques disponibles pour une telle description sont soit continues, comme l'approche GØosta-tistique, soit discontinues, comme les modles de facis, BoolØens, ou bien par Indicatrices ou Gaussiennes SeuillØes, ou enfin Markoviens. Ces modles de facis sont mieux capables de prendre en compte la connectivitØ des strates gØologiques, telles que les chenaux enfouis à forte permØabilitØ, ou au contraire les facis fins de barrires de permØabilitØ, qui ont une influence importante sur les Øcoulement, et, plus encore, sur le transport. Les modles gØnØtiques rØcemment apparus ont la capacitØ de mieux incorporer dans les modles de facis les observations gØologiques, chose courante dans l'industrie pØ-trolire, mais insuffisamment dØveloppØe en hydrogØo-logie. On conclut que les travaux de recherche ultØrieurs devraient s'attacher à dØvelopper les modles de facis, à les comparer entre eux, et à mettre au point de nouvelles mØthodes d'essais in situ, comprenant les mØthodes gØo-physiques, capables de reconnaître la gØomØtrie et les propriØtØs des facis. La constitution d'un catalogue mondial de la gØomØtrie et des propriØtØs des facis aquifres, ainsi que des mØthodes de reconnaissance utilisØes pour arriver à la dØtermination de ces systmes, serait d'une grande importance pratique pour les applications.Resumen La heterogeneidad se puede manejar por medio de la definición de características homogØneas equivalentes, conocidas como promediar o tratando de describir la variabilidad espacia...

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Section: Stochastic Shalesmentioning

confidence: 79%

Dealing with spatial heterogeneity

et al. 2005

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“…As a consequence, it may be possible to postulate more than one conceptual model for a site that is consistent with site characterization data and observed system behavior, as evaluated in the history-matching period. Although the potential importance of conceptual model uncertainty has been accepted for some time (Apostolakis 1990;Mosleh et al 1994), practical methods to assess the impact of model uncertainty on prediction have not found their way into widespread practice.…”

Section: Concentrationmentioning

confidence: 99%

Combined Estimation of Hydrogeologic Conceptual Model, Parameter, and Scenario Uncertainty with Application to Uranium Transport at the Hanford Site 300 Area

Meyer¹,

Ye²,

Rockhold³

et al. 2007

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“…Application of this conceptual model to a numerical flow model is based on site-specific characterization of natural rock fractures in the Climax stock granite. A continuum approach (e.g., Svensson, 2001a,b;Ando et al, 2003;Reeves, 2006) is used to model groundwater flow through the Climax stock. This continuum model is based on a novel algorithm that directly maps fracture zones of any strike and dip orientation, represented as discrete fracture planes, as grid cell conductivities on a three-dimensional, finite-difference grid.…”

Section: Conceptualization Of Groundwater Flowmentioning

confidence: 99%