Model build up
Analogue models are built in a motorized deformation box allowing one or simultaneous deformations (compression, strike-slip, extension, gravity) in different configuration (flat or complex basement). Sediments overlay the wood basement and consisted of sand, pyrex, corundum or micro-beads, which are dry granular materials simulating brittle sedimentary rocks and silicone (SGM 36) and sand/silicone mixes, which are viscous Newtonian materials simulating ductile rocks. The thicknesses of the different layers, strengths and velocities of deformation are scaled appropriately following Hubbert (1937) and Ramberg (1967). Erosion/deposition was modeled by removing or adding granular material (alternation of sand and pyrex).
All experiments were recorded with an X-ray tomographer (Colletta et al., 1991). Acquisition of a cross section is obtained by the complete rotation of X-ray source and coupled detectors around the sand box experiment. To reconstruct a 3D block, we acquire juxtaposed cross sections through the whole model. The acquisitions are made at regular time steps allowing us to record the 3D evolution of the model through time (4D).
All experiments can be loaded in a workstation used for seismic interpretation and can be interpreted as well.