Ann: Drilling Update Preparing to Reach Primary Targets, page-135

Additionally ...

• The 'tight reservoir' properties of the 200 Horizon are localised, due to being at the edge of the trap. Otherwise the drill indicates sand, and back into the middle of the trap Scott indicates the tightness would not exist. So decent reservoir properties.
• Looking at the presented cross sectional image, the brightest amplitudes are the 200 and the 600 (Upper Angwa) Horizons, with a small part in the 500. Not much indication in the 250 or 400 so no suprise there is nothing to report there.
• So if 200 is still in play, but 50m or so to the south, then the sesimic identified HC amplitudes are correct ... and this is very good news for Upper Angwa, especially if that might shale seal is as good as it sounds

So far we have seal (shale), trap (as seen in the dip in the sesimic), source (shale, and 200 Horizon indications) and resorvoir (sand).
For those that missed it, lighter colour on the right hand side of this drill graphic indicates sand. Dark colour indicates shale.

So as indicated by Scott, light colour is very good for reservoir capabilities.
(Most of the prolific oil production and indeed most of the giant oilfields are in sandstones. Sandstones generally exhibit high primary permeabilities)