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Morphological Changes of Carbonate Deformed Clasts in a Neogene Fault ZoneNormal access

Authors: O.A. Igbokwe, M. Mueller, O. Abah, G. Bertotti and A. Immenhauser
Event name: Third EAGE Workshop on Naturally Fractured Reservoirs
Session: Poster Session 1
Publication date: 05 February 2018
DOI: 10.3997/2214-4609.201800040
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.31Mb )
Price: € 20

Summary:
We studied the morphological changes of a deformed shallow-water carbonate -that has been dolomitized at an early diagenetic stage in a Neogene fault zone. Orthorhombic rock lithons characterise the structural fabric of the fault zone. Lithons are generated from the intersection of fracture sets. Fractures intersect at approximately 90 +/- 20o and dip from steeply inclined to vertical with dominant strike directions W-SW. The thickness and the spacing of the lithons vary between 1 and 35cm and 0.5-5cm respectively. Their geometrical analysis gives an overall mean aspect ratio (mAr) values of 1.5, that is, mean aspect ratio of 1.6 (large-sized), 1.5 (Medium-sized) and 1.5 (small-sized) with standard deviation (sd) between 0.4 - 0.6. We proposed a general deformation and morphological change of clast model in carbonate fault zone assuming elastic deformation. Fluids play a great role and they are linked with the dolomitization of the brecciated rocks. Keywords: Mosaic breccias, fractures, deformation and morphological change.


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