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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 77 (1993)

Issue: 11. (November)

First Page: 1860

Last Page: 1873

Title: Prediction of Normal-Previous HitFaultNext Hit Geometries--A Sensitivity Analysis

Author(s): Martha Oliver Withjack, Eric T. Peterson (2)

Abstract:

Several workers have developed cross section balancing schemes for extensional structures. Using these geometric models, structural interpreters can predict normal-Previous HitfaultNext Hit geometries at depth by specifying the shape of a folded bed in the hanging wall of a normal Previous HitfaultNext Hit, the deformation mechanism that accommodates the folding, the footwall counterpart of the folded hanging-wall bed, and the dip and location of the Previous HitfaultNext Hit segment between the hanging-wall and footwall beds. We have systematically determined how uncertainties in these input parameters affect the prediction of normal-Previous HitfaultNext Hit shape and detachment depth. Our sensitivity analysis shows that reasonable uncertainties in the fold shape near the normal Previous HitfaultNext Hit, the deformation mechanism, the footwall correlation, and the fa lt dip produce large uncertainties in the predicted Previous HitfaultNext Hit geometry. Reasonable uncertainties in the fold shape far from the normal Previous HitfaultNext Hit and the Previous HitfaultNext Hit location, however, produce only small uncertainties in the predicted Previous HitfaultNext Hit geometry. Our work suggests that if seismic and well data are lacking or of poor quality, then geometric models cannot provide unique answers to questions about the geometry of a normal Previous HitfaultNext Hit at depth. Geometric models, however, can provide a range of possible Previous HitfaultTop geometries.

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