Technical Content

Contrary to conventional seismic that focuses in a narrow band in middle frequencies, broadband seismic aims at acquiring information within the whole bandwidth emitted by the source. A good knowledge of the source signature is thus of paramount importance in broadband processing. However, the ...

A great deal of effort has been expended to improve the amplitude reliability of migration. The similarity of reverse time migration (RTM) to the gradient of full waveform inversion (FWI) indicates that preserved amplitude RTM can help improve FWI. We develop the theoretical derivation ...

Here we develop and present a 4D processing flow including ΔSΔR (the sum of the mis-positioning of the sources and receivers from baseline to monitor survey) thresholding and parallel pairwise binning with transfer operators to improve the quality of the 4D products while optimizing ...

In this paper a method is described to update the low frequencies of the elastic parameters coming from pre-stack time lapse inversion in a data driven manner. In the process no assumptions are made regarding the nature of the reservoir changes. Also no assumptions ...

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 ...