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

Author:

Agosta Fabrizio12

Affiliation:

1. Department of Geological and Environmental Sciences, Stanford University, Stanford, CA, USA (e-mail: fabrizio_agosta@hotmail.com)

2. Present address: Dipartimento di Scienze della Terra, Università di Camerino, Camerino, Italy via Gentile III da Varano, 62032 Camerino (MC), Italy

Abstract

AbstractBoth structural and petrophysical (porosity, ϕ, 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 ϕ and k) and major slip surfaces, and damage zones of fragmented and pulverized carbonates (high ϕ and k) and small faults. The host rocks are Mesozoic, platform-related boundstones with low ϕ (<1%) and low k (<1×10−4 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 ϕ, pore radii and elastic moduli.

Publisher

Geological Society of London

Subject

Geology,Ocean Engineering,Water Science and Technology

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