--> Best Practice Structural Modelling and Kinematic Algorithms Used for Geometric and Sequential Restoration in Salt Basins

AAPG/SEG International Conference & Exhibition

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Best Practice Structural Modelling and Kinematic Algorithms Used for Geometric and Sequential Restoration in Salt Basins

Abstract

Abstract

Geometric and sequential restorations of salt structures can provide valuable information about petroleum systems. Commonly, geometric restorations are used to assess the validity of interpretations; for instance, performing a 3D jigsaw restoration to identify gaps or overlaps around a diapir. This can lead to significant improvement of interpretation at the margins of salt structures. Sequential restoration workflows aim to reverse the effects of geological processes in order to determine hydrocarbon trap development around salt structures and investigate basin architecture through time.

The basic workflow for geometric and sequential restorations of salt structures involves: using appropriate back-stripping techniques to restore physical compaction, isostasy and post-rift thermal subsidence; restoring supra- and sub-salt faulting; and, using unfolding algorithms to restore the effects of salt movements on supra-salt sediments. A key advantage of the workflow is that it can be performed quickly, allowing different scenarios to be rapidly tested and evaluated.

In this presentation, we will use a series of synthetic and natural examples from the Gulf of Mexico and the North Sea, to assess the implications of using different algorithms and techniques for the geometric and sequential restorations. In particular we will focus on the differences caused by using simple shear or flexural shear unfolding algorithms to restore the effects of salt movement. We will demonstrate that the selection of simple shear can lead to incorrect gaps and overlaps during a restoration, and pronounced differences in the shapes and location of hydrocarbon traps.