HETEROGENOUS CARBONATES – INTEGRATING PLUG AND WHOLE CORE DATA USING ROCK TYPES

摘要

The biggest challenge in carbonate reservoir characterization is the multiscale heterogeneity in the pore geometry and the rock texture.The standard laboratory characterization of the rock properties using plugs(1”-1.5”diameter) raises the question about how representative a plug is of this intrinsic multiscale heterogeneity found in carbonates.Whole core samples sometimes are used to try to cover the scale of heterogeneity. This paper is part of an ongoing study,where we aim to integrate three scales of data: whole core,plug,and mini-plug(5mm diameter) using tomography(CT) images and measured petrophysical properties.Petrophysical rock types(PRTs) and digital rock simulations are the tools used to connect these different scales.In this paper we explore the relation between laboratory measurements performed on plug scale and whole core scale,by using PRTs. We also present an example of integration of these two scales for permeability using a Darcy flow solver for upscaling.Upscaled values for permeability are within 10% of the full Lattice-Boltzmann pore scale solution.