dai2belts1 Apr 2021 12:29
@dai thank you for keeping the bb active, havent popped in here for some time and just saw a whole heap of discussions going. all good stuff. and good questions raised.
I am a LTH so take your fill as you want to, or none at all - but i will try and give my views in normal, non tech lingo. Please DYOR as i have stated in the past, I am a numpty.
seismic and number of exploration wells:
there are no heat map produced from seismic. in its most simplistic explanation, imagine a sound wave (from a source) travelling through multiple medium and reflects back at different frequency. this is what is being read (receiver). as you can imagine, there will be a lot of noise when this reflections get picked up which requires "cleaning." this process is very mature and there are different quality of source and interpretation methods that can be applied. it does sound quite scary but its a trialed and tested successful method. 3D is better than 2D for obvious reasons.
So now that they have a map built up from different seismic vintages and responses (to improve their interpretation), they have a geo model which is littered with uncertainties, they will need to reduce it. Rock physics will tell them likely fluid types present in the accumulation to an extent. the main uncertainty would be:
1. the extent of the accumulation / reservoir (its not a box filled with He or other gases / fluids, they sit in the pore space of rocks, all pressured up). To reduce the uncertainty of reservoir extension (to get volume in place firmed up), you need to drill wells. now you can drill 1 well only, but then you might miss the lateral extension and the true size of the field. Sometimes, you aim to drill at the proposed edge, and in this case, both failure and success can be deemed valuable as it tightens the number (volume) up. We may also want to drill one in the crest, just to prove presence and do a well test to understand
1. flow potential
2. take samples to QC samples
3. run the well test long enough to check the extent of reservoir boundary
so the more wells you can drill as cheaply in the early stage the better it is, and failure in one well does not mean failure of the project, it could just mean they are testing an outer edge to confirm presence of He up to P10 level. for example.
3 (firm) +1 (contingent) wells is great news - which means they will be better at reducing uncertainties. my bet with the contingent well would either be as a back up (just in case one of the firm well planned encounters problem) or testing the outer edges of assumed parameters.
still, lots of risks at this stage. i wont comment on seep presence and how does this correlate with caprock, overburdens, etc but if they do share the interpretation, one thing to look for is leakage / plume which should show clearly in 3D seismic. similarly, presence of pock marks on surfaces would indicate a sudden & large release. otherwise, it could be just small leaks through leaky