--> ABSTRACT: Flexural-Slip Based Restoration in 3-D; A New Approach, by S. J. Kane, G. D. Williams, T. S. Buddin, S. S. Egan, and D. Hodgetts; #91021 (2010)

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Flexural-Slip Based Restoration in 3-D; A New Approach

KANE S. J., G. D. WILLIAMS, T. S. BUDDIN, S. S. EGAN, and D. HODGETTS

Restoration of cross-sections in two dimensions is commonly used for the validation of complex geological structures. Three restoration techniques which are commonly applied are: vertical shear construction; inclined shear construction and a flexural slip construction based on Suppe (1983). Extension of existing flexural constructions to three dimensions (3-D) proves difficult due to the need to predetermine 3-D axial surfaces related to complex fault bends prior to deformation.

Research has recently concentrated the development of truly 3-D flexural-type constructions. The model invokes fore- and back-shear of the hangingwall during deformation according to the nature of the fault bend folds. The angular shear and geometry of the 3-D axial surfaces do not have to be pre-calculated. Volume in the hangingwall, and the surface areas of interfaces, are conserved between restored and deformed states. The lack of pre-determined geometrical constraints significantly reduces the amount of processing time required to run the models, and allows complex fault surfaces to be considered. The method is particularly applicable to interpretations from 3-D seismic data sets. As the method is truly 3-D we have the ability to model all modes of deformation including contractional, extensional, wrench and oblique slip. Non plane-strain will ultimately be introduced into the models to allow for the strains associated with, for example, oblique ramps or tip zones on faults with lateral and down-dip displacement gradients.

AAPG Search and Discovery Article #91021©1997 AAPG Annual Convention, Dallas, Texas.