The Depositional Model

	The rock ``deposition'' is done by sedimentation, compaction, and cementation of the sets of 10,000-100,000 grains from an arbitrary size distribution using our 3D DEM code. The initial grain shapes are spherical, and the final grains form a set of bonded irregular polyhedra. Our algorithm creates rock samples of a desired porosity and bulk strength. Once a rock sample has been created in the computer, it is discretized at a desired resolution into a set of cubic atoms, or voxels. A voxel either belongs to the pore space or to the solid. From this point on, it does not matter if the 3D rock image came from a computer simulation, a micro-focused CT, a Focused Ion Beam (FIB) invasive rock reconstruction, or an Advanced Light Source (ALS) X-ray tomogram.
	The pore space of the loose sand above after compaction and cementation in pore throats
	The pore space of the loose sand above after compaction and cementation in pore bodies