Building a two-dimensional geological model and property upscaling of inclined heterolithic successions.
Engineering Honours Degree 2008
University of Adelaide
The area of interest is about 12 km south-east of Drumheller, Alberta. Within this area the Facies Association of particular interest is the Inclined Heterolithic Strata (IHS). The inclined heterolithic strata consist of cm-scale triplets of fine sandstone, carbonaceous material, and mudstone and had formed on gently dipping bars within an estuarine system.
Porosity is an additive property and was upscaled using simple averaging techniques. Upscaling the dynamic property permeability required more than the simple averaging methods used for porosity because the ‘effective permeability’ is influenced by its distribution.
The study established that there is no single upscaling technique that can perform the best in upscaling a complex heterogeneous reservoir there should be a variation between different techniques.
The height and width extent of cell aspect ratios plays a pivotal role in generating an accurate coarse model. The limitation of cell height in the J-direction is 0.48 m.
The arithmetic and geometric techniques investigated produced comparable results in upscaling porosity and facies type. Averaging techniques have no trouble in upscaling large blocky units, but for the thin units it is much more difficult.
The Full Tensor method is most efficient in the J-direction. Permeability tends are retained at an upscaling ratio of 36. Upscaling techniques are effective up until the upscaling ratio of 8.