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Abstract

This paper demonstrates why a recent innovation using 3D seismic surveys is an exceptional tool for defining regional frameworks and play models. Traditionally, regional studies are based on 2D seismic interpretation and geological mapping, with subsequent input from prospect level 3D seismic data. However, improvements in hardware and software, together with technical advancements, now allow merging of contiguous 3D seismic datasets into one seamless MegaSurvey volume that may encompass an entire basin. Such coverage provides a consistent regional framework and perspective for detailed studies. It also provides a basis for high-grading plays and enables detailed assessment of critical elements within a petroleum system (e.g. fans and channels).<br>The PGS North Sea MegaSurvey, currently covers over 100,000 sq km. This coverage has enabled Paleocene fans to be fully imaged using seismic-volume attributes, which produced new play fairway concepts and increased regional understanding, thus rejuvenating interest in a mature basin. Similar megafeatures were identified in the PGS Dampier Sub-Basin MegaSurvey in Australia and the Campos Basin MegaSurvey in Brazil. In the Dampier Sub-Basin, feeder channels to the ~50 km long Angel fan system traversed the Lambert Shelf, along the Rosemary Fault Zone, and deposited sediments into the Lewis Trough during the Tithonian. Late Jurassic movement of the Rosemary Fault Zone had an impact on the depositional history of this fan system and hence on the critical elements of the associated petroleum system. In the Campos Basin, the Tertiary channel is ~100 km long. It lies adjacent to the producing fields of the Marlim complex. The MegaSurvey allows mega-channel and salt-induced structures to be interpreted with a high degree of confidence, thus reducing exploration risks in an ultra-deep water setting. These examples clearly illustrate the value of the “big picture” to explorationists and illustrate how MegaSurveys can provide an invaluable tool in stimulating activity in basins around the world.

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/content/papers/10.3997/2214-4609-pdb.256.P04
2006-11-27
2024-03-29
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