RE: Mr ST/trek/dai27 Aug 2021 20:26
Hi Bunsa,
““but I am not sure about those clay seals containing free gas above the basement”
“What leads to these concerns?”
It’s my amateur deduction from the following within the RNS’s.
Tai 2 was 20m from Tai 1....
“Tai-2 is located ~20m from Tai-1 and utilises the same drill pad”
Tai-2 objective was to prove a working shallow system....
“With confirmation of a working helium system, Tai-1 supports ongoing exploration with helium shows identified at multiple stratigraphic intervals. The drilling at Tai-2 will test one of several targets highlighted for additional exploration following positive results from Tai-1.”
Why drill only one of several? If this is our 3rd drill did we only get 80m?? Why not got down to then next horizon while on site?
“Tai-2, although completed without identifying helium gas, has provided valuable information on shallow trap and seal potential”
“Results from Tai-1 have shown a prolific basin with helium shows identified at multiple levels from near surface to basement. Tai-2 has verified the POTENTIAL for development of newly identified 'Shallow' traps within the Lake Bed Formation......”
Traps = more than one trap. Multiple levels. Why didn’t we go deeper?
“The well targeted continuation of a 2.2% helium show identified in a sandstone interval at 70.5m in Tai-1: A high-grade gas show which potentially indicates free gas in the subsurface. Wireline logging of Tai-2 demonstrated continuous clay over this interval, SUGGESTING that the reservoir in Tai-1 pinched out against clay, which provides both vertical and lateral seal.”
I don’t get the pinching out. Seismics showed multiple stacked horizons. I would have expected gas if not at 70m then 500m! Why would they in effect have moved the rig keeping so close to Tai-1 where they had shows and now nothing. It’s the same seismics...
Ok......
“Current seismic data does not accurately resolve trapping styles at a shallow depth. Helium One is therefore reviewing several alternative low-cost geophysical techniques to test over known structures in the Tai area, before deployment over a wider area in the basin.”
Hence the ‘SUGGESTION’...
So they have to ‘re-measure’ before deployment of ‘water drill’. I thought it was disappointing that we didn’t get a discovery in the shallow traps. The data indicates ‘we were unlucky’ ...’pinching’.
If, however, we have data on Tai 1 as per RNS in shallow surely the next ‘water drill rig’ should be drilling Tai-1 shallow to get a discovery?
Then in first Tai 1 RNS....
“Petrophysical analysis indicates no free gas in the uppermost thinly bedded Karoo sands associated with helium shows.”
I don’t have CONFIDENCE that there is enough free gas above the 130m seal or the other structures hold free gas at this location. This is my interpretation having reread the RNS’s. I understand someone else can read it and have a completely different view especially if they are more knowledgeable.