Technical Content

We applied full waveform inversion to a seismic dataset from offshore Gabon. This dataset features complex geology such as diapirism, shallow gas pockets and dewatering faults. We show the results on a large production-size swath from an advanced full waveform inversion method based on ...

Numerous evaluations, conducted on various sites, converge towards a shared conclusion: the geophysical value of an acquisition is primarily driven by the density of traces acquired in the field. To confirm this principle also applies in North Africa, ENI and CGG agreed on a ...

In this paper we introduce an AVO QC workflow which was initially designed for ultra-dense land datasets. Its purpose is to monitor the AVO behavior at key steps of a processing sequence on the full area of interest and not only limited to a ...

This paper describes the construction of a high-resolution anisotropic FWI model that is used to help image a karstified carbonate layer and also to help define the underlying clastic reservoirs. The karst zones show extreme velocity rugosity, especially as compared to the surrounding sediments ...

In this paper a comparison of deterministic and geostatistical inversion approaches to reservoir characterization of a complex gas saturated clastic reservoir with thin coal beds will be discussed. This type of reservoir is characterized by high acoustic contrasts which cause challenges for inversion techniques ...

Water column statics caused by tidal variation and water velocity change during seismic surveys is one major source of noise in marine 4D projects. Correction of this statics effect is a key step in any marine 4D processing. Applying water column statics correction requires ...

Surface wave inversion (SWI) for S-wave velocity plays an important role in near surface characterization and PS-wave velocity model building for depth migration. A hybrid approach is proposed to reduce non-linearity for multi-modal inversion without a-priori identification of higher order modes. This method is ...

The compensation of absorption loss inside the imaging process using attenuation models estimated by Q-tomography is now widely accepted and used in the industry. This technology becomes even more important in the case of a complex dataset. For the Martin Linge field, characterized by ...

An automated and real-time field PSTM system, called TeraMig, was applied during the acquisition of a land 3D WAZ survey for PDO. The system was used to migrate one million vibrated points (around 10 billion traces) and was able to generate a real-time field ...