1887

Abstract

Summary

This study investigates pore-scale deformation fabrics in clastic and carbonate reservoir rocks using X-ray microtomography (XCT), revealing subtle grain-scale modifications previously unresolved with conventional techniques. Focusing on quartz grains as rigid markers, the research compares deformation fabrics in sandstones of the Rayoso Formation (Neuquén Basin, Argentina) and calcarenites of the Maciños Formation (Cotiella Basin, Spain).

In the Rayoso Formation, quartz grains exhibit bedding-controlled fabrics in undeformed zones, transitioning to tectonic-controlled orientations near deformation bands, despite the absence of visible macroscopic deformation. Similarly, in the Maciños Formation, quartz grains show bedding-parallel alignment and reorientation along deformation band planes due to heterogeneous deformation.

Results highlight the heterogeneous and localised response of the rock matrix to deformation, with quartz grain fabrics reflecting subtle tectonic imprints. These findings suggest that deformation significantly influences pore structures and fluid flow properties, offering new insights into reservoir heterogeneity.

The study demonstrates XCT’s potential in subsurface characterisation, bridging a critical gap in understanding deformation mechanisms at the pore scale, and emphasises its importance for improving predictions of reservoir behaviour. Further exploration of the interplay between deformation and reservoir properties is recommended.

© EAGE Publications BV
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2025-06-02
2026-02-18

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References

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Cryptic Fabrics in Reservoir Rocks Revealed by X-Ray Microtomography
Conference Proceedings 2025, 1 (2025); https://doi.org/10.3997/2214-4609.2025101330
/content/papers/10.3997/2214-4609.2025101330
/content/papers/10.3997/2214-4609.2025101330
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