Not sure abt 200m gross thick.
Think its more like 55m for the Calypso & 82m for the LG. Total 137m gross thknss, as per their Nov '09 preso.
Keeping it simple.
Example:
Calypso gross Rock vol (RV): 37291 m3
Area: 680 sqkm
Thk: 37291/680 = 55m
Since part of Artemis prospect straddles WA-269P, the Calypso RV in WA-360P has been scaled back to 20650 m3 (or 55% of the original vol of 37291 m3).
Similarly for LG, RV is 30506 m3, area: 351 sqkm, so thickness: 82m. Scaled back to 23769 m3 (or 78%)
So whilst 137m is the gross thickness frm the desktop study, its more like 94m for the 2 sands within 360P.
After they run the logs,
- they'll work out if 25%, 45%, or 70% of this gross thk is 'net thk' of good sand &
- if its gas or water saturated (30%, 50%, 70%) &
- its porosity 16-22% is good enough.
So end of the well, they want the sands 2b gas saturated with a decent thickness & good porosity.
As an analogy, simply visualise a loofah (partly soaked with water or engine oil).
Eg: Wheatstone #1 had a 53m net sand which flowed ~54 MMcfd.
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