Technical Library

Based on a previous 2D seismic survey in offshore Sierra Leone and Liberia revealing the exploration potential of the margin, a 3D long offset survey in deep water Sierra Leone was acquired in 2008....

Subsalt velocity updating (Wang et al., 2004, 2006) can be categorized into two approaches: 1) Datadriven subsalt tomography based on residual moveouts; and 2) interpretation-driven subsalt WEM scans...

The northern Siberia occupies a wide area with several sedimentary basins with high hydrocarbon potential. To the north from it there is the Laptev Sea rift basin which is believed to be one of the...

Madagascar is situated in the South West of the Indian Ocean at a distance of about 400 km off the East coast of Africa (figure 1). It is the third largest island in the world and covers an area of...

Reverse time migration (RTM), being based on the two way wave equation, can accurately account for wave propagation in both up and down directions. As a result, RTM can generate much improved...

Exploration activity is still opening new frontiers, with one of the most recent surveys targeting the Republic of Somaliland, an autonomous region in the Horn of Africa. As in any frontier, working...

When a company is considering a new frontier area for exploration, a number of crucial questions require a rapid answer. The foremost of these is whether or not there is an active petroleum system....

Multiple reflections of seismic waves off of the seafloor have been keeping processing experts busy for years. To get a clear image of the subsurface, the true or primary seismic reflection must be...

"We have just completed one of the most demanding seismic acquisition programmes we have ever undertaken˝, says Jørn Christiansen, principal advisor to TGS.

It is well understood that accurate salt interpretation is critical to subsalt imaging. When reflections from the saltsediment boundaries are not discernible, it takes many iterations to test various...