Deciphering background fractures from damage fractures in fault zones and their effect on reservoir properties in microporous carbonates (Urgonian limestones, SE France) - Archive ouverte HAL Access content directly
Journal Articles Petroleum Geoscience Year : 2019

Deciphering background fractures from damage fractures in fault zones and their effect on reservoir properties in microporous carbonates (Urgonian limestones, SE France)

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Abstract

Most carbonates have a dual porosity and permeability (matrix and fracture). As fractures are preferential conduits for fluid flows, fracture networks strongly impact reservoir hydraulic properties. Two fracture patterns can affect reservoirs: random background fractures in the host rock and damage zone clustered fractures in fault zones. This study identifies the structural and diagenetic attributes of both fracture patterns and determined their respective impact on reservoir properties. The study focuses on the East part of La Fare Anticlinal (SE France). Lower Cretaceous, Urgonian facies carbonates underwent a polyphase tectonic history. Faults were set up as normal and were later reactivated as strike-slip. We made a 290m scan-line along the outcrop to characterize fracture network in and outside the fault zones. The diagenetic analysis on 45 thin sections in Polarized Light Microscopy, with SEM and cathodoluminescence evidenced 3 cementation phases and 2 micrite recrystallization phases. This study shows that fault zone structural properties and deformation are dependent of initial host rock background fractures network. Fault zone structure with damage zone fracture network encouraged the fluid to flow and the cementation of S2 phase. This fluid flow, absent in the host rock strongly modified the reservoir properties of the studied zone.
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hal-02465124 , version 1 (25-11-2022)

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Attribution - CC BY 4.0

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Irène Aubert, J. Lamarche, Philippe Leonide. Deciphering background fractures from damage fractures in fault zones and their effect on reservoir properties in microporous carbonates (Urgonian limestones, SE France). Petroleum Geoscience, 2019, 25 (4), pp.443-453. ⟨10.1144/petgeo2019-010⟩. ⟨hal-02465124⟩
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