Do Stratigraphic Variations Influence Fault Zone Architecture in Deep-Water Fold-Thrust Belts?
Rob Butler1, Bill McCaffrey1, and Richard Morgan2 1 University of Leeds, Leeds, United Kingdom 2 VeritasDGC, Crawley, United Kingdom In thrust system analysis, fault zones are commonly modelled as discrete surfaces, with surrounding rock deformation explained by combination of fault shape and displacement gradients. However, high resolution 3D seismic data from the compressional parts of gravitationally-driven fold belts on continental margins show more complex fault zone architectures. While in some settings stratigraphic cut-offs against inferred faults are crisply imaged, in others there are significant zones, up to 1km wide, within which there is substantial amplitude loss. In many instances these represent zones of closely-spaced subsidiary faults, separating fault-bounded slices of strata, together with distributed strain; adjacent stratal reflectors may be deflected into the fault zone. These non-discrete fault occurrences entail different predictions for structural development,
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- Do Stratigraphic Variations Influence Fault Zone Architecture in Deep-Water Fold-Thrust Belts?
