A desktop study using the recently acquired 2D seismic data on the prospectivity over the oceanic crust, in ultra-deep water Gabon.
Technical Content
Practical strategies for interbed multiple attenuation
Practical strategies for interbed multiple attenuation
Interbed multiples cause artifacts in subsurface images because they are incorrectly migrated when using standard primary-based migration algorithms. While surface-related-multiple-elimination has been well established as a standard step in seismic processing, the usage of interbed multiple attenuation (IMA) remains low due to various practical ...
Foothills structural model de-risking with 3D magnetotellurics
Foothills structural model de-risking with 3D magnetotellurics
Geophysical imaging in the foothills environment is typically hampered by complex structure, and the high cost of data acquisition in poorly accessible, rugged topography. Seismic imaging is particularly difficult due to poor signal penetration, steeply dipping structures and irregular data coverage. The use of ...
Designing an Exploration Scale OBN: Acquisition design for subsalt imaging and velocity determination
Designing an Exploration Scale OBN: Acquisition design for subsalt imaging and velocity determination
Direct wave arrivals are the most robust signals to determine velocity and consequently they have been used for almost a century in hydrocarbon exploration. The reason is simple as the arrival time is explicitly available. In order to acquire these direct arrivals in a ...
Improving images under complex salt with ocean bottom node data
Improving images under complex salt with ocean bottom node data
Subsalt imaging at Stampede field in the Gulf of Mexico has remained challenging for decades due to the existence of a large and complex sediment inclusion inside thick tabular salt. Recently, appropriate full-waveform inversion (FWI) algorithms have been developed for automatic salt model updating ...
The Zambezi Delta Basin: A Complex Puzzle with Missing Pieces
The Zambezi Delta Basin: A Complex Puzzle with Missing Pieces
Exploration on the African continent has traditionally been concentrated in prolific basins on the Sub-Saharan Western margin, in detriment to the East. Proven prolific basins, existing infrastructure, favourable and progressively transparent regulation; along with the analysis of prospective conjugate basins of Brazil are just ...
Sparse nodes for velocity: Learnings from Atlantis OBN full-waveform inversion test
Sparse nodes for velocity: Learnings from Atlantis OBN full-waveform inversion test
As the key step in subsalt imaging, conventional salt model building has typically relied on manual interpretation of the salt geometry, which proves to be difficult for resolving complex salt models. As a result, subsalt imaging has been approaching a plateau in the last ...
Internal multiple attenuation for OBN data with overburden/target separation
Internal multiple attenuation for OBN data with overburden/target separation
Areas with complex overburdens pose a major challenge for seismic imaging of deep targets. Reduced illumination can compromise velocity estimation and the image at the target level. A solution to this problem is given by ocean bottom node (OBN) acquisitions. They provide increased illumination ...
Illuminating Santos Basin’s pre-salt with OBN data: Potential and challenges of FWI
Illuminating Santos Basin’s pre-salt with OBN data: Potential and challenges of FWI
Santos Basin has become one of the most prospective oil provinces in the world. Due to the geological complexity, OBN acquisition has emerged as an imaging solution. It provides the full-azimuth and long-offset illumination FWI needs to realize its potential. Given the right data ...