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
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
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
Figure 1: RTM image gathers (left) vs. Common Offset RTM (COR) gathers (right)
Figure 2: Before (left) and after (right) RTM stack using COR gathers for subsalt update
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