Application of multiple-point geostatistics on modelling pumping tests and tracer tests in heterogeneous environments with complex geological structures
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(2) Problem setting • Complex geological heterogeneity. 16-7-2014. pag. 2.
(3) Problem setting True distribution. Multiple point geostatistics. Sample data. Training image. Variogram based simulation. Multiple-point simulation. 16-7-2014. pag. 3.
(4) 2750 air permeability measurements. Problem setting Complex geological heterogeneity. Field work. Groundwater modelling Permeability simulations. Training image. 16-7-2014. pag. 4.
(5) Problem setting • Validation of the approach of combining field measurements, multiple-point geostatistics, upscaling and groundwater flow and transport modeling • Pumping test. • Groundwater tracer test. 16-7-2014. pag. 5.
(6) Methodology: field work. 16-7-2014. pag. 6.
(7) Methodology: training image construction and upscaling. Clay drape simulation. 15.3m. 55 m. 16-7-2014. pag. 7.
(8) Methodology: groundwater flow and transport modeling. 16-7-2014. pag. 8.
(9) Results: pumping test. • Homogeneous and horizontally • Edge model isotropic model 16-7-2014. pag. 9.
(10) Results: pumping test. • Error variance = 1.06E-2 • Homogeneous and isotropic model. • Error variance = 7.29E-3 • Edge model. 16-7-2014. pag. 10.
(11) Results: tracer test. • Homogeneous and horizontally • Edge model isotropic model 16-7-2014. pag. 11.
(12) Discussion • Extensive field campaign for heterogeneity characterization • Very detailed information about fine-scale heterogeneity. • Multi-well pumping test + multi-injection tracer test. • Slight improvement of fit for pumping test and groundwater tracer test. 16-7-2014. pag. 12.
(13) Discussion • Other features than fine-scale heterogeneity play an important role Cm-scale geological heterogeneity versus field-scale models Other heterogeneity features than clay drapes Variations of pumping discharge rates Wells screened in more than one geological layer Boundary conditions, e.g. interaction with surface water features – Sampling issues – – – – –. 16-7-2014. pag. 13.
(14) Conclusions • Advantages – Incorporation of realistic geological heterogeneity – Efficient multiple-point geostatistical simulation • Limitations – Computation time for fine-scaled groundwater flow and transport model – Other features than fine-scale heterogeneity play an important role. 16-7-2014. pag. 14.
(15) Thank you Marijke Huysmans and Alain Dassargues. 16-7-2014. pag. 15.
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