Corrib South confusion20 Jun 2024 02:20
It's a little frustrating to read on here conflicting numbers relating to Corrib South, and for many investors this must be confusing. With the caution that I am far less familiar with the Irish assets than I am with those in Morocco, I will try to explain the issues.
Both the producing Corrib field and the prospective Corrib South are part of the half-graben Slyne Basin, with centres 18km apart. The reservoir is the same for both – Triassic age Sherwood Sandstones. Both are sealed by the Upper Triassic Mercia salt and mudstones. Both have as the source rock Carboniferous age Westphalian coals & shales. Vermilion are operators of the Corrib field, and are very familiar with the local geology, and are the only likely partner for Predator. They not only get revenue for the gas, but extend the life of their fixed assets, thus compounding the value.
The potential confusion here has arisen because there are two CPRs available. Both of these are on the PRD website. The updated SLR CPR was published January 2020. For the purposes of last year's Prospectus, TRACs produced a separate CPR dated July 2023. imho TRACS are extremely conservative in their estimates for both Ireland & Morocco – for example, we have previously discussed here that TRACS numbers for the Guercif Jurassic carbonate prospect assume only a 50m thick reservoir, compared to PRD's estimate of 289m in the latest RNS.
There may also be some confusion over definitions: GIIP (gas initially in place) is the total amount that may be present in the prospect, but much of this will not be commercially recovered. This quantity is calculated by making assumptions on reservoir area & thickness, porosity, charge, etc. Various additional risk factors & assumptions are then applied to this number to come up with Prospective Resources – the volume of gas that could be expected to be commercial.
That is further split into P10, P50 & P90 – P10 is the largest number, and indicates that there is a 10% chance that this number will be achieved or exceeded. Similarly, P90 is the smallest number, representing a 90% chance that this volume will be achieved or exceeded. You have already guessed that P50 is the best estimate.
So what are the numbers? - I refer to p.241 of the SLR, and pp.58, 59 & 174 from the TRACS CPRs. All in BCF – P90, P50, P10
SLR 30% gcos (geological chance of success)
GIIP: 264 / 566 / 1130
Recoverable: 184 / 425 / 945
Net to PRD: 92 / 212.5 / 452.5
TRACS 44% gcos
GIIP: 23 / 93 / 267
Recoverable: 26.5 / 137.8 / 484.8
Net to PRD: 13.25 / 68.9 /242.4
The wider the range between P10 & P90, the greater the number of unknowns (guesses!) used in the calculation – x4.3 difference for SLR, x18.3 for TRACs - this reflects my concerns with TRACS. Take your pick!