Technical Content

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 ...

We present how to create realistic geology conformal anisotropic velocity models and reduce depth misties in standard tomographic and high-resolution FWI depth velocity modelling. We assume that localized variations in both velocity and anisotropy are caused by changes in the lithology and we use ...

A conventional CMP based COV binning will create footprint and migration noise for acquisitions where sources and receivers are at different depth levels and/or PS waves are imaged. The OVT muting & weighting technique is a way to overcome this problem. The OVT muting ...

The seismic monitoring solution presented here is a permanently buried, fully automatic, and continuous seismic acquisition and processing system. It ensures remarkably repeatable daily seismic. Our specific calendar oriented 4D processing flow is described and applied on a monitoring system installed for Shell on ...

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 ...