game: spot the odd one out ?, page-39

Thanks again..

Found this old prospectus with some quite thorough info on 448.

http://globaldocuments.morningstar.com/documentlibrary/document/c62a5638ad6f219c.msdoc/original

See page 70, 71,73

This is the nub of it...
Interpretation of the limited available 2D seismic data has delineated a number of potential structures and play-types.
However, the region is not explored sufficiently to mature prospects to ”ready-to-drill” status. The structures observed
on seismic are within the Grant Group and although these are not the primary objective of the exploration in the block
they may form an alternate secondary play fairway.
Several leads have been mapped in the lower Grant Group in the north-most part of the permit area, adjacent to the
Calamia-1 (Figure 18). In addition a pinch-out play against the Anketell shelf is highlighted.
Leads A, B, C were formed as a result of drape-over and compaction of the Grant Group deposits over tilted
Ordovician fault blocks. A northwest–southeast trending structural component dominates these features. Sandstone
with excellent porosity-permeability parameters in the Lower Grant Group provides the reservoir. These directly overlie
the potential Goldwyer Formation or Willara Formation source rocks. The seal is provided by intraformational shale
intervals. Major risks are associated with maturation levels of the underlaying source rock intervals, migration, and
reactivation of the bounding faults during the Fitzroy movement.
Leads D and E were mapped to the northeast. Though these are four-way closed drape structures over possible salt
related features in the Carribuddy Group, leads D and E, are considered less attractive due to the risk associated
with charge accessibility. In this area the Grant Group reservoirs overlay the Carribuddy Group and any potential
hydrocarbons, generated by the Goldwyer Formation would need to migrate through a thick salt sequence.