Browsing by Author "Fedenczuk, Leon L."

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    PETROPHYSICAL ROCK MODELING
    (1991-07-01) Wyvill, Brian; Fedenczuk, Leon L.
    Generation, migration, trapping, and discovery of petroleum, as well as its primary and enhanced recovery, depend to a large extent upon the geometry of the porous microstructure. The determination of petrophysical rock properties is difficult because of their complexity ranging from apparent random structures to configurations with heterogeneities at different scales. We present a method of visualizing a realistic 3D representation of these structures. While rock descriptions always contain many deterministic elements and features, some elements are most conveniently generated by stochastic models. The primary purpose of this study was to survey ways in which stochastic modeling might be used to create rock images, obtain realistic representation of rock textures, and provide basic model control and visualization capability. We use an "octree" data structure to represent rock models of arbitrary precision. Objects created using this technique are collections of subvolumes of variable sizes each having the same physical properties. A reconstruction of porous media results in a pore network where the total porosity is the same as that of the actual rock. The model and techniques presented have been designed in an extensible fashion to enable the development of algorithms for a simulation of geometrical models, along with other simulated properties of the rock models such as electrical resistivity, fluid flow, permeability, and acoustic velocity. The developed methodology may be used to do: quick evaluation of rock parameters, calibration, teaching, determination of the estimation sensitivity, and testing of the computer software for image analysis.
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    VISUALIZATION OF CONNECTIVITY IN OCTREE BASED MODELS
    (1994-07-01) Fedenczuk, Leon L.; Wyvill, Brian
    An interesting problem in the oil and gas industry is the visualization of the movement of oil and gas in porous media. In our work we have simulated the porous media using a pointer-based octree, representing the distribution of pores and grains. This data structure allows us to model the connectivity of the pores and thus visualize fluid penetration within the media. Whereas earlier models represent a serious simplification or two dimensional homogeneous layers, our model provides us with a statistically accurate distribution in three dimensions and thus a more accurate representation of the connectivity. In this paper we present our data structure and the techniques which were used to create models of porous media and their porous networks. Next, we present algorithms for connectivity in octrees and we show how to apply them to modelling and visualization of fluid penetration in porous media.