Aquifer architecture analysis using ground-penetrating radar: Triassic and Quaternary examples (S Germany)

Applying the concept of ''analogue studies'' long used in reservoir characterization, outcrop analogues in two aquifer units of Southern Germany have been investigated: Upper Triassic (Keuper) alluvial sandstones (Stubensandstein) and Quaternary glaciofluvial gravels. Architectural element analysis of the outcrops is combined with ground-penetrating radar profiles derived a few meters behind the outcrop walls. Such calibration is used to better understand the three-dimensional sedimentary architecture. Many sedimentary units at the same time represent hydraulic flow units and are characterized by specific radar signatures. This approach leads to promising results, not only in unconsolidated aquifers but also in fully consolidated sedimentary rocks. Our studies will lead to a database with which more realistic predictions of the hydraulic behaviour of sedimentary aquifers systems, needed for numerical hydrogeological simulations, will be possible.