Application of multiple-point geostatistics on groundwater flow and transport in media with complex geological heterogeneity: lessons learnt and remaining challenges
19
0
0
Texte intégral
(2) Applications of multiple-point geostatistics on groundwater problems Ronayne et al., 2010. Dell’ Arciprete et al., 2012. Comunian et al., 2011. Feyen and Caers, 2006 Le Coz et al., 2011 11-7-2014. pag. 2.
(3) 2750 air permeability measurements. Project overview Complex geological heterogeneity. Field work. Groundwater modelling Permeability simulations. Training image. 11-7-2014. pag. 3.
(4) Project overview: Validation and applications Pumping test. •. •. •. Groundwater tracer test. Aquifer thermal energy storage. Possemiers et al., in prep. 11-7-2014. pag. 4.
(5) Lessons learnt. 11-7-2014. pag. 5.
(6) Lesson 1 Be careful when using multiple-point geostatistics if you’re a perfectionist. 11-7-2014. pag. 6.
(7) Multiple-point geostatistics • Elegant • Smart • Simple • Incorporate geological heterogeneity in a realistic way • Way of communicating with geologists. 11-7-2014. pag. 7.
(8) The “perfect” 3D training image. SBED. Comunian et al., 2012. 11-7-2014. pag. 8.
(9) The “perfect” model. 11-7-2014. pag. 9.
(10) Lesson 1: Be careful when using multiple-point geostatistics if you’re a perfectionist. 11-7-2014. pag. 10.
(11) Lesson 2: Showing a training image is dangerous. 11-7-2014. pag. 11.
(12) Showing a training image is dangerous. versus. Explicit = easy to criticize 11-7-2014. pag. 12.
(13) How good should my training image be? • Compare to geological reality or to variogram based/uniform approaches? • What is the effect of having a “slightly off” training image? • Sensitivity to selection of training image? • Verification of training images by data • Groundwater problems: data scarcity, no seismic campaigns 11-7-2014. pag. 13.
(14) Lesson 3: Real-world field cases ≠ synthetic cases. 11-7-2014. pag. 14.
(15) Real-world field cases ≠ synthetic cases • Many synthetic and semi-synthetic applications of multiplepoint geostatistics • Promising technique • Convincing results. • Real-world field case • •. Frustration Disappointment. 11-7-2014. pag. 15.
(16) Real-world field cases ≠ synthetic cases •. Other features than fine-scale heterogeneity play an important role – – – – – –. Variations of pumping discharge rates Wells screened in more than one geological layer Boundary conditions, e.g. interaction with surface water features Sampling issues Various uncertain factors …. 11-7-2014. pag. 16.
(17) Real-world field cases ≠ synthetic cases • Validation using in situ measured groundwater levels and concentrations • Encouragement of real world applications • Is it worth incorporating fine scale geological heterogeneity in groundwater problems or are other features (boundary conditions, data quality, …) more important for correct predictions?. 11-7-2014. pag. 17.
(18) Conclusions • Training images don’t need to be perfect – How good should it be? – Sensitivity of groundwater models to TI? – Validation of TI? • Encouragement of real-world applications – Realistic idea of potential of MPS in practical groundwater applications. 11-7-2014. pag. 18.
(19) Thank you Marijke Huysmans and Alain Dassargues Marijke.Huysmans@vub.ac.be. 11-7-2014. pag. 19.
(20)
Documents relatifs
For the same model, Amirat and Ziani established the existence of a global weak solution in a one-dimensional porous medium [10] and Feng studied the existence and uniqueness of a
Therefore, transition-metal complexes with multiple metal metal bonds also appear as promising systems for their third- order NLO properties, which constitutes the topic of
Data on water use (Table 1) were obtained from census records in each country (Kenya, Comoros Union and Tanzania) at the highest resolution available for each study area
For case n 1 (real PAHs contamination) thé simulation of thé PAHs behaviour in thé dissolved phase is strongly influenced by thé choice of key parameters like thé partition
Eh (mV) Nitrate (mg L -1 ).. Numerical groundwater flow and transport modelling.. • Darcy flux are continuously changing at the river – aquifer interface... • Hydraulic
The numerous wells available from precedent characterisation campaigns (presented in Chapter 2) were very useful to perform monitoring and field experiments, which
All the criteria used for comparison (mean objective function, number of history matched models, posterior probability maps and classification) are more alike when soft data is
The thermal component has an infiltration area close to the elevation of the Salanfe Lake ( ≈ 1900 m) and the reservoir tempera- ture of the deep flow system should probably not
