Computerized Tomography application: Coal integration between sorption and carbon dioxide

Abstract

Dual-energy CT scanning is not a novel method for evaluating reservoir rock. It has been used for many years. Each time the rock is scanned with a different X-ray energy, the same region is scanned twice. Dual energy scanning is successfully used in investigations of fluid flow visualization. Along with the lack of appropriate software and procedures for generating mass density and nuclei count pictures from high and low energy CT data, the added problem is the absence of processes for characterising the cores using density and atomic numbers. The density and atomic number images can now be generated from the dual-energy data using commercially available software. Several strategies are described in this work to better characterize reservoir rocks using density and atomic number data. Small plug samples with known petrophysical parameters were first used to validate the process. A 60-foot-long core section was scanned with two different X-ray energies CT scans every five centimetres (2 inches) from an Upper Jurassic carbonate reservoir in Saudi Arabia. Qualitatively, the results were interesting and could help us better understand carbonates. To calculate porosity values using approximate mineral compositions, this document provides step-by-step directions in the form of diagrams.