Evaluation of the conventional and synchrotron X ray tomography applied to heterogeneous oil reservoir rocks

Abstract

Carbonate and sandstone reservoirs play an important role in oil industry as they host over 50 of the world s hydrocarbon reserves. For an accurately assessment of porosity and pore size distribution of such complex pore network, which affect directly the macroscopic characteristics of multiphase fluid flow, X ray computed microtomography micro CT emerges as a powerful tool. In contrast to lab based X ray micro CT XCT , synchrotron X ray micro CT SXCT images are commonly free of artefacts i.e. beam hardening and the unique properties of synchrotron sources enable the X ray imaging of complex and heterogeneous materials in greater detail, with higher quality, and short acquisition time. This work reports results of cone beam computed microtomography XCT in comparison with synchrotron computed microtomography SXCT applied to very heterogeneous carbonate and sandstone reservoir rocks. We analyze the quality of the image generated in terms of detection of details and artefacts, the advantages and limitation of each technique, as well as features like contrast, sharpness, and signal to noise ratio SNR . Although SXCT offers significant advantages over XCT, the latter gains in cost of operation, accessibility and user friendlines