Technical Content

We discuss methods to quantify the impact, reliability and value of low frequencies as provided in modern towed streamer broadband acquisitions. Acquisition, processing and inversion all have a role to play in creating reliable low frequency data. In this paper, focusing on marine data ...

Thrust complex imaging in the Timor Trough suffers from the fault shadows due to strong lateral velocity variation. We demonstrate a new workflow to tackle this. Broadband seismic data were acquired with high signal-to-noise ratio of low frequency. With broadband input, FWI derived better ...

The carbonates in the pre-salt area of the Santos basin off-shore Brazil are good candidates for potential reservoirs of hydrocarbons. The presence of highly reflective stratified salt in this basin, combined with the focusing of energy due to the concave shape of these reflectors ...

While 5D data reconstruction has become widespread in recent years, we show that the use of 5D model spaces in some settings may result in sub-optimal handling of structures exhibiting HTI traveltime behaviour. To overcome these problems we propose the use of a 6D ...

While sufficient for many deep water datasets, vertical designature in shallow water environments can lead to unsatisfactory levels of ringing and amplitude striping, particularly on outer streamers where the assumption of a vertical farfield signature is least accurate. In this paper we modify the ...

Receiver deghosting has been widely used to extend the bandwidth of marine seismic data. Efforts have also been made to remove the source ghost and signature to further maximize the bandwidth of the acquired seismic data. We present an inversion scheme for angle-dependent source ...

We use a North Sea example to demonstrate that the use of geological constraints in this extended tomography allows improving the focusing of the seismic image and providing a more geologically plausible velocity model also below complex overburdens.

With the new broadband acquisitions, allowing to record frequencies down to 2,5 Hz, and the new tomographic tools, allowing to resolve for vertical velocity components up to 6 Hz, we have moved for velocity model building from the situation of a mid-frequency gap to ...

In ocean bottom acquisition, receiver side deghosting is normally done by summing together the hydrophone P and geophone Z data. A prerequisite for this method to work effectively is the precise calibration of geophones to hydrophones, so as to compensate for the differences in ...