MIKE GEOMODEL CODE

University of North Texas Libraries, UNT Digital Library, Д¬rediting UNT Libraries Government Documents Department. The Sandia GeoModel : theory and user's guide., stats/stats.json?ark=ark:/67531/metadc883029Д«rannon, Rebecca Moss & Fossum, Arlo Frederick. oai/?verb=GetRecord&metadataPrefix=oai_dc&identifier=info:ark/67531/metadc883029 International Image Interoperability Framework (IIIF) For high-strain-rate applications, the GeoModel supports rate dependence through an overstress model. Simpler idealizations (such as linear elasticity, or Von Mises yield, or Mohr-Coulomb failure) can be replicated by simply using fewer parameters. Inter-well heterogeneities influencing fluid migration in deltaic reservoirs are controlled by lateral lithofacies changes and vertical complexities such as low permeability thin-beds. The GeoModel can employ up to 40 material input and control parameters in the rare case when all features are used. Results from this outcrop-to-geomodel study can be applied to WCM reservoirs in the subsurface and used as guidance to build more accurate geomodels in other basins. The GeoModel is a genuine unification and generalization of simpler models. Aside from kinematic hardening, however, the governing equations are otherwise isotropic. The geomodel supports deformation-induced anisotropy in a limited capacity through kinematic hardening (in which the initially isotropic yield surface is permitted to translate in deviatoric stress space to model Bauschinger effects). As such, it includes a yield surface, but the term 'yield' is generalized to include any form of inelastic material response including microcrack growth and pore collapse. Fundamentally, the GeoModel is a generalized plasticity model. Nonlinear elasticity is supported through an empirically fitted function that has been found to be well-suited to a wide variety of materials. Although developed for application to geological materials, the GeoModel actually applies to a much broader class of materials, including rock-like engineered materials (such as concretes and ceramics) and even to metals when simplified parameters are used. The model is designed to be used in conventional finite element architectures, and (to date) it has been installed in five host codes without requiring customizing the model subroutines for any of these different installations.

MIKE GEOMODEL CODE

The mathematical and physical foundations and domain of applicability of Sandia's GeoModel are presented along with descriptions of the source code and user instructions.

Mike geomodel