Tomography Using COR

Common Offset RTM Gathers (COR)

The TGS Common Offset RTM gathers (COR) is a reliable and efficient technology targeting the velocity building in the hard-to-illuminate salt and subsalt regions.

Common Offset RTM Gather for Velocity Updates

Common Offset RTM (COR) gathers is a new technique used to improve subsalt tomography updates utilizing TGS’ powerful RTM algorithm. COR gathers often contain subsalt events spanning the entire offset range (i.e., longer usable curvatures for tomography). In COR, shot gathers are split into N minishot gathers, each with a limited-offset range, and then migrated separately before stacking to offset gathers according to their input offset range.

COR gathers also have more reliable residual curvatures because each offset group is migrated independently and does not interfere with the neighboring ones.

COR is proven superior in perspective of signal/noise ratio, illumination and accuracy for salt and subsalt region. Combining COR with the existing tomographic inversion engine can yield much improved subsalt velocity resolution.

 

down arrow

A

PSDM gathers at Location A

PSDM Gathering Locations

Kirchoff Migration

Kirchoff

COR RTM

Move the Slider Left or Right
to Visualize the Images

Got it
Before SEISMIC
COR_B4_Seismic
After SEISMIC
COR_after_Seismic

Move the Slider Left or Right
to Visualize the Images

Got it
Before Velocity
COR_B4_Velocity
After Velocity
COR_after_Velocity

Need Help or More Information?

TGS offers subsurface data, including seismic, magnetic and gravity data, multibeam and coring data, digital well and production data as well as processing and interpretation from deepwater offshore to conventional and unconventional onshore plays.

Let's Talk Subsurface Data