An analytical method for calculating the performance of heterogeneous reservoirs and its use in uncertainty analysis

Abstract

An efficient analytical method for performance calculations in heterogeneous models is developed, under assumptions of a viscous dominated displacement process and unit mobility ratio. The method provides a quantitative measure of the effects of heterogeneities on displacement characteristics and production performance. Results indicate that the method has a potential for ranking a set of geostatistical reservoir model realizations in terms of production performance, thereby providing a basis for selecting realizations for detailed numerical simulations.

Geostatistical analysis in weathering studies: case study for Stanton Moor building sandstone

“…Porosity is the fractional space between solid particles in a given volume whereas permeability, in simple terms, is a measure of how easily a fluid of a certain viscosity flows through a rock under a pressure gradient (Allen et al, 1988), The challenge is to characterize the spatial variability of these rock properties and assess the control on fluid flow rates and directions. This information can be used to give a greater understanding of fluid flow processes in a porous medium such as sandstone, the economic benefit of which has been used to optimize hydrocarbon recovery and aquifer capabilities (Kjønsvik and Alvestad, 1995;Prosser and Carter, 1997). However, knowledge of the movement of fluids and associated salts through rocks can also be used in the investigation of weathering of stone.…”