Fault deformation, seismic amplitude and unsupervised fault facies analysis: Snøhvit Field, Barents Sea

Jennifer Cunningham (Corresponding Author), Nestor Cardozo, Christopher Townsend, David Iacopini, Gard Ole Waerum

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Abstract

We present an integrated seismic imaging and fault interpretation workflow to characterize the seismic expression in and around an E-W trending central fault system imaged in near-angle stack seismic data of the Snøhvit Field, Barents Sea. Three E-W normal fault systems offset five Triassic-Lower Cretaceous seismic horizons across the field. Fault throw is largest at depth and decreases with shallowing. Dip distortion (DD) decreases in magnitude and extent with shallowing. Fault enhancement (FE), a filter used to detect edges, was applied on a blend of tensor, semblance and dip attributes, and allowed us to classify fault zones into four unsupervised seismic fault facies (mid-high FE). High FE facies occur at the center of the fault zones and are abundant in the highest thrown eastern part of the field. The FE facies decrease radially outwards field wide. Facies correlate with throw and dip separation gradient, which are in turn related to mechanical stratigraphy controlling fault propagation. We observe systematic seismic amplitude variations: a major amplitude drop on the fault plane, and a brightening and dimming linked to fault-related synclines and anticlines, respectively. Our workflow establishes a methodology for fault interpretation, linking fault throw, DD, seismic attributes and fault facies classification.
Original languageEnglish
Pages (from-to)165-180
Number of pages15
JournalJournal of Structural Geology
Volume118
Early online date16 Oct 2018
DOIs
Publication statusPublished - Jan 2019

Keywords

  • faults
  • dip distortion
  • seismic attributes
  • seismic amplitude
  • fault facies
  • Faults
  • Fault facies
  • Seismic attributes
  • Seismic amplitude
  • Dip distortion

ASJC Scopus subject areas

  • Geology

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