--> Abstract: 3D Restoration Techniques For Strike Slip Deformation, by M. Bonara, A. K. Pahl, T. Murray, A. D. Gibbs, and T. Dooley; #90928 (1999).

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BONARA, M.1, A. K. PAHL1, T. MURRAY1, A. D. GIBBS1, and T. DOOLEY2
1Midland Valley Exploration Ltd, Glasgow, UK
2University of London: Royal Holloway, Egham, UK

Abstract: 3D Restoration Techniques for Strike Slip Deformation

The kinematics and analysis of strike-slip deformations are poorly understood despite their economic importance. Due to the complexity of deformation style, they represent a particular challenge for interpreter and modeller alike. In this paper we present new methodologies to enable interpreters to validate their interpretation and to assist in modelling poorly imaged parts of the structure. The approach represents a significant extension of the principal of balance and kinematic structural analysis from essentially dip slip systems to true strike slip kinematics.

The techniques used in this study apply new fault deformation algorithms, which map deformation to the fault surface by using a fault parallel flow algorithm. Variable 3D shear analogous to back shear in an overthrust terrain is used to generate shear variation in three dimensions away from the fault surface. The algorithm has been implemented to allow volumes on both sides of the fault to be deformed by splitting the deformation into a two stage process for computational simplicity.

The approach has been applied to a synthetic scaled sand box model. A digital model of the analogue experiment was constructed using serial 2D sections. This 3D model was then restored using the deformation flow approach to produce a workflow for the process and a methodology of applying the technique to geological data. Sensitivity of the technique is discussed and validated by reference to the limitations and constraints of analogue and digital modelling techniques.

AAPG Search and Discovery Article #90928©1999 AAPG Annual Convention, San Antonio, Texas