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The AAPG/Datapages Combined Publications Database

Journal of Petroleum Geology

Abstract

Journal of Petroleum Geology, vol.24 (2), April 2001, pp 147-169
Copyright copyrght.jpg (4253 bytes) 2001 by Scientific Press Ltd. All rights reserved.

Previous HitFAULTNext Hit-RELATED SOLUTION CLEAVAGE IN EXPOSED CARBONATE RESERVOIR ROCKS IN THE SOUTHERN APENNINES, ITALY

A. Billi* and F. Salvini*

The deformation associated with a number of kilometre-scale strike-slip Previous HitfaultNext Hit zones which cut through outcropping carbonate rocks in the Southern Apennines was investigated at regional and outcrop scales. These faults trend roughly east-west and were studied at the Gargano Promontory on the Adriatic Coast (in the Apulian foreland) and in the Matese Mountains, about 120 km to the west (within the Apenninic fold-and-thrust belt). The Previous HitfaultNext Hit zones are 200-300 m wide and typically comprise a core surrounded by a damage zone. Within Previous HitfaultNext Hit cores, Previous HitfaultNext Hit rocks (gouges and cataclasites) typically occur along master slip Previous HitplanesNext Hit; in damage zones, secondary slip Previous HitplanesNext Hit and solution cleavage are the most important planar discontinuities. The protolith carbonates surrounding the Previous HitfaultNext Hit zone at Gargano show little deformation, but they are fractured in the Matese Mountains as a result of an earlier thrust phase.

Cleavage surfaces in the damage zone of the studied faults are interpreted to be Previous HitfaultNext Hit-propagation structures. Our field data indicate that cleavage-Previous HitfaultNext Hit intersection lines are parallel to the normals of Previous HitfaultNext Hit slip-vectors. The angle between a Previous HitfaultNext Hit plane and the associated cleavage was found to be fairly constant (c. 40o) at different scales of observation. Finally, the spacing of the solution cleavage surfaces appeared in general to be regular (with a mean of about 22 mm), although it was found to decrease slightly near a Previous HitfaultNext Hit plane. These results are intended to provide a basis for predicting the architecture of Previous HitfaultTop zones in buried carbonate reservoirs using seismic reflection and borehole data.

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