التفاصيل البيبلوغرافية
| العنوان: |
Structural control on fluid flow and shallow diagenesis: Insights from calcite cementation along deformation bands in porous sandstones. |
| المؤلفون: |
Sole, Leonardo Del, Antonellini, Marco, Soliva, Roger, Ballas, Gregory, Balsamo, Fabrizio, Viola, Giulio |
| المصدر: |
Solid Earth Discussions; 6/5/2020, p1-48, 48p |
| مصطلحات موضوعية: |
FLUID flow, FLUID control, SANDSTONE, CALCITE, DIAGENESIS, DRONE photography, AERIAL photography |
| مستخلص: |
Porous sandstones are important reservoirs for geofluids. Interaction therein between deformation and cementation during diagenesis is critical since both processes can strongly reduce rock porosity and permeability, deteriorating reservoir quality. Deformation bands (DBs) and structural-related diagenetic bodies, here named Structural and Diagenetic Heterogeneities (SDH), have been recognized to negatively affect fluid flow at a range of scales and potentially lead to reservoir compartmentalization, influencing flow buffering and sealing during production. The hydraulic behavior of DBs is not yet fully constrained, and it remains poorly understood also how diagenetic processes interact with DBs to steer fluid flow mechanisms and evolution. In this contribution we present two field-based studies from Loiano (Northern Apennines, Italy) and Bollène (Provence, France) that contribute to elucidating the structural control exerted by DBs on fluid flow and diagenesis recorded by calcite nodules associated with the bands. We relied on careful field observations and a variety of multiscalar mapping techniques (photography, string mapping, and drone aerial photography), integrated with optical, scanning electron and cathodoluminescence microscopy, and stable isotope (δ13C and δ18O) analysis of nodules cement. In both case studies, at least one set of DBs precedes and controls selective cement precipitation. Cement texture and cathodoluminescence patterns, and their invariably negative δ13C and δ18O value ranges, suggest a meteoric environment for nodule formation. In Loiano, DBs acted as low-permeability barriers to fluid flow and promoted selective cement precipitation. In Bollène, clusters of DBs restricted fluid flow and focused diagenesis in parallel-to-band compartments. Our work shows how low-permeability DBs in porous sandstones can actually affect fluid flow and localize diagenetic processes (in the shallow crust) that, in turn, could further enhance the sealing capacity of these structural features. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
