Results

We apply AMO regularization to a portion of a real OBC data set, the Alba field. The Alba oil field is located in the UK North Sea and elongates along a NW-SE axis. The oil reservoir is 9km long, 1.5km wide, and up to 90m thick at a depth of 1,900m subsea Newton and Flanagan (1993).

Figure  illustrates the main problem. Observe the gaps in both the PP-CMP and the PS-CMP gathers. Our goal is to fill these gaps with energy from the surrounding traces and to preserve the physics of wave propagation.

 

cmps
Figure 1 CMP gather for the PP (left) and the PS (right) components for one crossline of the 3D cube

A multicomponent OBC data set consists of both a PP and a PS section. Since the literature already presents extended work on PP regularization, we will present compact but complete regularization results for the PP portion. However, we will present more results and extended analysis for the PS section.

We use a portion of the entire 3D cube. This subsection consists of 17 crosslines with 719 cmps each. The PP section uses only the absolute value of the offset, for a total of 121 offsets. The PS section uses the full offset, however the maximum offset extension is reduced from 8000m. to 4000m. since the contribution of this far offset to this portion of the data is practically null.