Technical Content

Spanning decades of exploration and production in the United Kingdom Continental Shelf, many programs of towed streamer data have shaped our knowledge of the Central North Sea. However, the fundamental lack of illumination and azimuth/offset coverage provided by towed streamer geometries, remains a blocker ...

Full waveform inversion (FWI) using diving waves has in recent years become a standard model-building tool in the Central North Sea (CNS). Below the maximum depth of diving wave penetration however, we have remained reliant on ray based tomographic methods, which although powerful, have ...

The Greater Castberg survey was acquired in 2019 using a source-over-spread acquisition design with an additional source at the front of the streamers, towed by the receiver boat, to permit recording of longer offsets. Starting from an initial anisotropic model, time-lag full waveform inversion ...

Offshore Gabon has several challenges for seismic exploration. The major difficulty is obtaining a detailed and accurate velocity model. Complicated salt structures with overhangs, variability within the salt and carbonate rafts with Karst features pose difficult challenges to conventional velocity model building. Moreover, these ...

We discuss the processing and imaging challenges relating to a marine seismic survey acquired northwest of the Shetland Islands. The proximity of the survey to the islands forced the acquisition direction to be strike to the subsurface geology. A shooting vessel provided wide azimuth ...

The combination of ever-increasing computational power and more robust algorithms have made it possible to run full-waveform inversion (FWI) to higher frequencies and, also, offer more possibilities to take advantage of the reflections in the inversion. Through a process known as FWI Imaging, the ...

The Messinian interval in the West Nile Delta, offshore Egypt, is a thin evaporite layer characterized by highly irregular velocities with rapid spatial variations. Its complexity poses unique challenges for sub-Messinian reservoir imaging, resulting in erratic gather curvatures, distorted structures, and nonuniform illumination. Conventional ...

The geology of northern Oman presents significant challenges for land velocity model building. We show in this paper that these challenges can be overcome by using an integrated high-resolution velocity model workflow, through the combination of different types of waves, that allow resolving different ...

Inversion has become the standard procedure to quantify elastic properties using seismic. PP seismic is commonly used for this purpose, but in areas where PP seismic is affected by gas pockets or mud volcanoes, the reflectivity can be compromised for reservoir characterization. PP-PS inversion ...