Speaker
Description
High-resolution 3D imaging of reservoir rocks across different length scales remains a major challenge when trying to connect pore-scale processes to core-scale behavior. In this work, we present the first results of zoom-in tomography performed on 1.5-inch reservoir rock samples at the MOGNO beamline of the SIRIUS synchrotron, using a high-energy configuration and a CdTe hybrid detector. This detector provides high efficiency at elevated photon energies and can acquire images at rates of up to 2000 frames per second. Such fast acquisition is particularly useful for time-resolved 4D tomography of porous materials, enabling the study of dynamic processes such as fluid flow, displacement fronts, and deformation.However, the detector’s modular design introduces challenges for full-field imaging. Gaps between detector tiles create regions of missing data in the raw projections, which can generate artifacts in the reconstructed volumes if they are not properly treated. Addressing these effects requires dedicated correction approaches and careful experimental planning. Even so, combining this detector with MOGNO’s high-energy optics and cone-beam geometry remains highly advantageous for multiscale characterization of reservoir rocks.
The experiments were performed on 1.5-inch reservoir plugs provided by Petrobras, representing typical Brazilian subsurface lithologies. The beamline setup enabled tomographic scans with pixel sizes ranging from several tens of micrometers down to a few micrometers. This zoom-in capability allows the investigation of features spanning from core-scale textures to pore-scale details within the same intact sample, without the need for destructive preparation.
The initial results show that the high-energy configuration provides good penetration and enables the visualization of structures across scales. Coarse-resolution scans revealed large features such as fractures and connected macropores, while micron-scale scans resolved detailed pore geometries and grain contacts. These results highlight the strong potential of the MOGNO beamline for advanced 3D imaging of porous materials. The combination of high photon energies, a fast CdTe hybrid detector, and a flexible zoom-in tomography strategy offers a powerful platform for studying rocks and other porous systems in a multiscale context.
| Country | Brazil |
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