ABSTRACT: The role of volume-based interpretation and 4D reconstruction in deciphering the evolution of the structural and stratigraphic architecture of an inverted basin, Southern Poland

Bond, Robert M.G.¹, and John Byrd²
(1) Paradigm Geophysical (UK) Ltd, Slough, Berkshire, United Kingdom 
(2) Paradigm Geophysical Ltd, Houston, TX

Volume-based investigation of a 3D seismic volume from southern Poland reveals a well-imaged, complexly structured basement-cover unconformity which strongly influenced the location and geometry of superposed kilometre-scale contractional structures. Structural reconstructions and forward models of the periclines and associated growth strata helped guide interpretation of these features and highlighted previously unrecognised hydrocarbon migration pathways.

Forward modelling and reconstruction of one prominent periclinal hydrocarbon trap greatly enhances interpretations of the poorly imaged forelimb and major fault. Model based interpretation through the bad-data zones reveals previously hidden details of the kinematics of the structural evolution of this area. Corroborating evidence is provided by published geometric models of growth fold development (Suppe et al, 1991). Restoration and forward models of the structure reveal the influence of the lateral distribution of an evaporitic décollement on the location, amplitude, growth rate, stratigraphic events associated with the contractional structures. The re-utilisation of suitably oriented extensional faults during contraction is also strongly suggested by the 4D reconstruction, and confirmed by re-examination of the seismic volume. Along with calculations of the lateral and local variation of strain across the structure, these insights have important implications for trap size, fault-seal potential and hydrocarbon migration pathways.

AAPG Search and Discovery Article #90913©2000 AAPG International Conference and Exhibition, Bali, Indonesia