Fold-related deformation bands in a weakly buried sandstone reservoir analogue: a multi-disciplinary case study from the Numidian (Miocene) of Sicily (Italy)

S Gambino, E Fazio (Corresponding Author), R. Maniscalco, R. Punturo, G. Lanzafame, G. Barreca, R W H Butler (Corresponding Author)

Research output: Contribution to journalArticle

3 Citations (Scopus)
5 Downloads (Pure)

Abstract

Deformation bands, usually recognized in association with faults, are here analyzed in relation to a tight synclinal fold developed in the Miocene Numidian turbidites of Sicily. Deposited above a growing thrust-wedge and then buckled during continued deformation, the porous Numidian sandstones form subsurface gas reservoirs elsewhere in the region and are analogues for deepwater systems in general. Structural data have been collected and statistically analyzed to characterize preferred orientations and size parameters (thickness, spacing, length) of deformation bands. Two distinct populations relate to folding: the most recent one is NE-SW oriented, which produced the most prominent structures, whereas an older one is partially obliterated. Microscopic investigation reveals porosity decreases within deformation bands with respect to host rock. The principal deformation mechanisms are grain rotation/sliding and pore-collapse, consistent with folding having occurred under low burial conditions. Within the thrust wedge, near-surface folding is widespread, as indicated by growth strata. Thus we expect early-burial deformation bands of the types (compaction an shear bands) illustrated here to be a component of reservoir damage in subsurface examples.
Original languageEnglish
Pages (from-to)150-164
Number of pages15
JournalJournal of Structural Geology
Volume118
Early online date23 Oct 2018
DOIs
Publication statusPublished - Jan 2019

Keywords

  • deformation bands
  • Numidian sandstones
  • porosity
  • X-ray microtomography
  • reservoir analogue
  • Reservoir analogue
  • Deformation bands
  • Porosity

ASJC Scopus subject areas

  • Geology

Fingerprint Dive into the research topics of 'Fold-related deformation bands in a weakly buried sandstone reservoir analogue: a multi-disciplinary case study from the Numidian (Miocene) of Sicily (Italy)'. Together they form a unique fingerprint.

  • Cite this