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Solving East Nile Delta’s Imaging Challenges through New Obn Acquisition and Advanced Processing Sequence
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, First EAGE Data Processing Workshop, Feb 2024, Volume 2024, p.1 - 4
Abstract
Summary
The East Nile Delta offshore Egypt has been a challenging area for seismic imaging due to the presence of substantial velocity heterogeneity resulting from a variable Messinian and complex fault structures. Conventional towed streamer has been pushed to its technical limit, but the imaging is still not sufficient for adequate representation of the subsurface. Improving seismic resolution has been a continued focus area since more seismic detail can provide valuable insights about the subsurface. Previous studies and knowledge gained through projects in other regions suggest that a step change in improvement of resolution can be achieved through improved acquisition, a better velocity model, improved signal to noise (S/N), boosting the high frequencies and improved imaging algorithms. The Atoll field was highlighted as a candidate to benefit from improved seismic resolution due to its geological complexity and value to the business. Results show that having an OBN acquisition allowed for improved spatial sampling and higher resolution. Acquiring offsets in excess of 24km contributed to robust high frequency velocity models capturing the subsurface in fine detail. Careful pre-processing with a focus on removing noise and multiples whilst preserving true amplitude reflectors have contributed to incremental improvements which turned out to be significant when combined.
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