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A rock material is anisotropic if it’s measurable physical properties such as velocity exhibit different values when measured in different directions. The safest assumption is that the subsurface is anisotropic. If anisotropy is ignored when imaging the subsurface, it could have adverse effects. These adverse effects include sub-optimal time-to-depth conversion, well-to-seismic mismatch, as well as a poorly focused seismic image. This paper presents the result of a seismic anisotropy study carried out on pre-stack depth migrated gathers in Greater Ughelli of the Niger Delta which is generally characterized by repeated sequence of finely layered sand/shale intercalations. These sand/shale sequences are generally bound to be transversely anisotropic. The signature of anisotropy on the depth migrated gathers is the so-called “hockey sticks’’. The first hockey sticks on pre-stack depth migrated gathers were observed and used for the mapping. The onset of anisotropy was correlated across an entire field (Assa North) in Greater Ughelli depobelt using seismic depth structure maps and fault polygons. The onset of anisotropy ranges from 1400ms – 1600ms. Anisotropy trend in study area is shallow in the NE, of average depth at the middle of the field and very deep SW.

The Onset and Trend of Anisotropy in Greater Ughelli of Niger Delta