RE: You need quality as well as quantity.12 Oct 2023 02:07
Part 2.
Traps are of three main kinds β anticlines (inverted pudding basin), tilted fault blocks, and diapirs (not to be confused with diapers). The first two are present across some of the Guercif licences, but most definitely not all, which will greatly reduce the volume potential. Diapirs β underlying the Jurassic is a thick layer of Triassic salt. This acts like a viscous liquid β it is less dense than the overlying rock and over millions of years will rise towards the surface forming underground salt domes and walls. H/cs become trapped against these impervious domes β this is the most common trap style in the Gulf of Mexico, where as you know, there is an awful lot of h/cs. Some of us have strong suspicions that there are many of these in the Guercif region. They can be identified by low gravity readings, as well as HSSI data.
I suspect that GRH has HSSI & other data indicating h/cs over much of the Guercif region including the area of buried & outcropping Jurassic β unfortunately this does not clearly indicate depth, so a strong reading will not differentiate between near-surface Neogene (MOU-Fan & Middle Sands), deeper Jurassic such as MOU-NE, or underlying Triassic, which is the main h/c source across North Africa. Graham β please correct me if I am wrong here.
One final point of possible confusion over the recent volumetric calculations: in the 11th July RNS, it said "The top Jurassic carbonate objective was reached at 1135 metres TVD MD". I am sure that the depth reference here was not to the top of the Jurassic, but to the top of the MOU-NE target, (the Jurassic carbonate objective) which is in fact towards the base of the Lower Jurassic.
So, 90 TCF in the Jurassic? β I think unlikely, since much of this rock volume does not have suitable reservoir characteristics nor trapping geometry. 90 TCF including the deeper strata? Just possible, but a lot more work needs to be done, and this will be by a company with a lot more than three staff, and a much bigger bank balance than Β£10M.