CREATION AND VISUALIZATION OF 3-D PHYSICAL PROPERTIES MODELS

Geologic framework models are used to define the geometry and properties for the modeling of physical processes such as groundwater flow or shock wave propagation. While most geologic framework models reflect the distribution of mapped geologic units or groups of units, the need sometimes exists for models of physical properties at a subunit scale to reflect the spatial variance of the properties within the unit. Often there are not sufficient direct geologic observations to accurately define the spatial variation of properties within units. Regional geophysical studies, conceptual models such as facies models, and/or stochastic methods may be used to define distribution of properties at this level of detail.

Numerous tools are available to create geologic framework models and to provide 3-D visualizations of models of physical properties. These tools range from high-cost ($100K+) geologic modeling packages, to moderately-priced geologic information systems (GIS), to open-source visualization packages. A blend of such products have been used at Los Alamos National Laboratory to create a number of 3-D geologic framework models as well as visualizations of framework and physical properties models.

Three-dimensional geologic framework models are presented for the Pajarito Plateau in New Mexico and Rainier Mesa in Nevada, illustrating strengths and weaknesses of some of the available software packages. A 3-D model of subsurface resistivity beneath the Pajarito Plateau may assist in the assignment of groundwater flow properties within units of the geologic framework model.