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Deformation of Poorly Consolidated Sanstone in Aghione Formation, Corsica, France
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 3rd EAGE International Conference on Fault and Top Seals, Oct 2012, cp-311-00057
- ISBN: 978-90-73834-35-4
Abstract
Deformation of poorly consolidated sandstone and its effect on petrophysical properties of the rock are investigated by structural fieldwork, in-situ measurements of permeability, microstructural analyses of thin sections and ultrasonic measurements of samples. The studied locality comprises a series of listric normal faults that cut through Aghione Formation (Miocene) in Corsica, France. Three types of deformation bands are reported. Surprisingly, intense cataclasis is observed in the phyllosilicate-rich (more than 20%) poorly consolidated sandstone. Permeability decreases up to two orders of magnitude in the damage zone (deformation bands), while it increases in the slip surfaces. The slip surfaces are open and make conduit to fluid flow, which is also confirmed by the field observation of fluid flow path.