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Abstract

The Canadian Beaufort MacKenzie Basin (BMB) contains many examples on two-dimensional seismic sections of what appear to be shale diapirs or shale-cored anticlines. Devon Canada acquired three-dimensional (3-D) seismic data across one such feature called Paktoa and, in the winter of 2006, drilled an exploration well flanking the possible shale diapir. Although the well successfully tested oil from the Eocene Taglu unit, no clear evidence existed that the structure was a shale diapir instead of a shale-cored or fractured anticline.

Tests of a Kirchoff prestack depth migration (PSDM) algorithm prior to drilling had resulted in no significant improvement. Following the drilling of the Paktoa C-60 well, Applied Geophysical Services used their proprietary beam algorithm to image very steeply dipping reflectors in the core of the Paktoa structure. Interpretation of this new seismic volume shows that Paktoa is an inversion anticline, likely formed by the reactivation of an earlier extensional fault system, and not a shale diapir.

The beam PSDM took just three weeks to apply to 400 km2 (154 mi2) of marine 3-D seismic data, and the vastly improved imaging has not only changed the interpretation of the Paktoa structure but also implies that many similar features in the Canadian BMB may also be steeply dipping anticlines instead of shale diapirs or shale-cored anticlines.

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