PETERSEN, KENNETH, and IAN LERCHE, Department of Geological Sciences, University of South Carolina, Columbia, SC

ABSTRACT: Stress-Strain Analysis using Experimental and Numerical Models

Experimental modeling provides means of determining the deformation path in the rocks surrounding an evolving diapiric structure as well as in the structure itself. Use of stiff materials deformed in a centrifuge allows for dissection and study of shape and bed geometries during the inversion process. Application of a novel quantitative model of the self-consistent evolution of salt and sediments to the results of experimental modeling of evolving diapiric shapes, and the associated strain pattern evolution, provides a calibration of the numerical model and constrain the involved shape-evolving parameters.

The mapped strain development provides information on the stress exerted in the rocks. Provided information with depth is available on elastic properties, strength of rocks against shear failure, and internal friction of the rocks satisfaction of the Mohr criterion can be evaluated and predictions can be made of rock failure i.e. fracturing. Estimates of fracturing and faulting in rocks around an evolving salt structure yield predictions to be made of, for instance, improved reservoir capacities and timing of break of sealing formations, leading to escape of possible trapped hydrocarbons, an important process to be incorporated in risk analysis of salt-related prospects.

AAPG Search and Discovery Article #90987©1993 AAPG Annual Convention, New Orleans, Louisiana, April 25-28, 1993.