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Geological Society, London, Special Publications; 2008; v. 299; p. 277-291;
DOI: 10.1144/SP299.17
© 2008 Geological Society of London

Fluid flow properties

Fluid flow properties of basin-bounding normal faults in platform carbonates, Fucino Basin, central Italy

Fabrizio Agosta1,2

1 Department of Geological and Environmental Sciences, Stanford University, Stanford, CA, USA (e-mail: fabrizio_agosta{at}hotmail.com)
2 Present address: Dipartimento di Scienze della Terra, Università di Camerino, Camerino, Italy via Gentile III da Varano, 62032 Camerino (MC), Italy

Both structural and petrophysical (porosity, {phi}, and permeability, k) data show that the basin-bounding normal faults of the Fucino Basin, central Italy, have a combined barrier–conduit effect on fluid flow. The deformed carbonates comprise fault cores of both matrix- and cement-supported fault rocks (low {phi} and k) and major slip surfaces, and damage zones of fragmented and pulverized carbonates (high {phi} and k) and small faults. The host rocks are Mesozoic, platform-related boundstones with low {phi} (<1%) and low k (<1x10–4 mD). The results of ultrasonic analysis suggest that the fragmented carbonates contain pores with a high aspect ratio, whereas the fault rocks have pores with a low aspect ratio and some moldic porosity. These two separate fluid units are modelled as an elastic cracked medium (fragmented carbonates), and as a granular medium (fault core). By using well-known correlations, their permeability is then computed from known values of {phi}, pore radii and elastic moduli.





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