Numerical modeling of the hydraulic signatures of horizontal and inclined faults |
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| Authors: | Silvain Rafini Marie Larocque |
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| Institution: | 1. Centre de recherche pour l????tude et la Simulation du Climat ?? l????chelle R??gionale, D??partement des sciences de la Terre et de l??atmosph??re, Universit?? du Qu??bec ?? Montr??al, Case postale 8888, Succursale Centre-ville, Montr??al, QC, H3C 3P8, Canada
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| Abstract: | Pumping tests in discontinuous media are commonly interpreted using radial/non-radial flow analytical models, which do not account for a large range of multistage real signatures that combine both flow types. The term radial is employed in Barker??s sense, referring to the cross-flow area growth with a flow dimension (n) equal to 2, while multistage refers to a flow response of several time periods with successive n values. Synthetic domains are used to numerically investigate the flow behaviour of faulted media, specifically the effect of fault inclination on multistage signatures. Simulations are performed using single faults surrounded by a permeable matrix to characterize drawdown series and to identify hydrodynamic scenarios associated with some diagnostic multistage n sequences. The n sequence 2 ?C <?2 ?C 2 results from interactions between the matrix and a horizontal to weakly inclined fault, while 2 ?C 1.5 ?C 2 corresponds to a higher fault inclination and is a combination of the generalized horizontally and vertically faulted models. These results improve the interpretation of ambiguous drawdown series from long-term pumping tests. This provides a better hydraulic characterization of faulted environments, allowing assessment of fault and matrix properties such as fault inclination. The approach is successfully tested on real datasets. |
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