Technical Content

Data from towed streamer surveys in shallow water depths are usually contaminated by different orders of seafloor reflections called water-layer-related multiples (WLRMs). The model-based water-layer demultiple (MWD) method effectively removes WLRMs. The initial development of 2D MWD was followed by a 3D implementation to ...

Full waveform inversion usually fails to update the sediment velocity in close vicinity of the top of salt (TOS) because of the strong velocity contrast between the sediment and salt. This phenomenon is a common challenge in practice, and it is not yet well ...

Low-frequency seismic data are crucial for the success of full waveform inversion (FWI) used in velocity model building. Marine acquisition technologies have evolved to increase low-frequency seismic signals. However, significant low-frequency noise, often caused by water flowing across the streamers, still alters the signal-to-noise ...

Ocean bottom node (OBN) data by nature have a broader bandwidth; however, the presence of source-side ghosts can reduce the useful frequency range and therefore damage seismic resolution. We demonstrate the benefits of 3D deghosting for OBN data from the Gulf of Mexico (GOM) ...

Over recent years, many authors have proposed to compensate the absorption loss effects inside of the imaging process through the use of an attenuation model. This is more particularly necessary in the presence of strong attenuations anomalies. Q tomography has been developed for estimating ...

In marine seismic surveys, seismic interference (SI) remains a considerable problem when marine seismic data sets are acquired in close vicinity of each other. We present a method for attenuating SI noise using a sparse Tau-P transform. Using a synthetic example, we demonstrate that ...

The anelastic effects of the overburden cause seismic amplitude attenuation, wavelet phase distortion and seismic resolution reduction. It is desirable to correct the frequency dependent energy attenuation and phase distortion in a prestack depth migration. The situation becomes more challenging in complex geological regions ...

We present a method for estimating the shape of salt bodies by using ray-based nonlinear slope tomography. The data to invert mainly consist of residual moveout (RMO) observed below salt shapes on migrated common image point gathers. We compute Fréchet derivatives made of traveltime ...

While most marine baseline surveys do not use broadband techniques, increasingly more monitor surveys are being adapted to broadband techniques that often use different receiver-depth profiles (e.g., deeper or variable-depth). A regular matching filter that has been commonly used in 4D time-lapse processing may ...