Hydraulic properties of fault zones in porous carbonates, examples from central and southern Italy
| Autor: | Maurizio Giorgioni, Fabrizio Agosta, Giuseppe Napoli, Andrea Rustichelli, Antonino Cilona, Fabrizio Storti, Fabrizio Balsamo, Emanuele Tondi, Pietro Renda |
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| Přispěvatelé: | Tondi, E., Rustichelli, A., Cilona, A., Balsamo,F., Storti, F., Napoli, G., Agosta, F., Renda, P., Giorgioni, M. |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Geology Cataclastic rock Fault (geology) 010502 geochemistry & geophysics 01 natural sciences Cretaceous Permeability (earth sciences) chemistry.chemical_compound Shear (geology) chemistry General Earth and Planetary Sciences Carbonate permeability sub-seismic resolution faults compactive shear banding Favignana Island Majella Mountain Petrology Porosity Geomorphology 0105 earth and related environmental sciences Permeameter |
| Popis: | We present the results of in situ permeability measurements performed, using a portable field permeameter, on normal and strike-slip fault zones that crosscut high-porosity carbonate grainstones. The measurement sites expose in the Cretaceous Orfento Formation of the Majella Mountain (Abruzzo, Italy), and the Lower Pleistocene deposits of the Favignana Island (Sicily, Italy). Nine small-displacement, compactive shear banding-based fault zones have been tested in the field. The fault offset ranges between 10 and 200 centimeters. The acquired permeability data indicate a two orders of magnitude decrease of porosity and permeability from the host rock to the cataclastic fault cores. A clear dependence of the fluid circulation paths through porous carbonates is therefore inferred at depth due to orientation, density and connectivity of the fault zones. Moreover, this study indicates the key role played by the pore network characteristics (pore dimensions above all) of undeformed host rocks on determining extremely different permeability values of the faulted porous carbonate grainstones. Accordingly, the results presented in this study may be helpful in applications such as geofluids management for improving the forecasting of carbonate reservoir quality and understanding the extent of reservoir compartmentalization. |
| Databáze: | OpenAIRE |
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