Jafarli C3714 Jun 2019 09:31
On 07.05.2019 I outlined some of the geological context and criteria relating to the forthcoming interventions at well C37 in the Jafarli Field. As this intervention is now imminent I thought I would add a few further observations for those interested.
The initial well deepening, of 15-20m further into the Middle Eocene is, as stated, to provide for a flow test from the stratigraphic unit which has been the main reservoir for all Jafarli production to date. In the 05.01.2017 Prospectus and CPR (table 2, pp 291) Chapman Petroleum Engineering Ltd assessed the cumulative production of crude from Jafarli as 3,411,000 STB (Stock Tank Barrel), all from the M Eocene. Gross proven reserves from the M Eocene were estimated with 90% probability at 792,000 STB comprised of 192,000 STB from 19 wells producing at a combined current rate of 70 STB/d and 600,000 STB from 3 as yet undeveloped wells predicted to produce at a combined 447 STB/d. Probable reserves based on 50% probability and a notional 12 new development wells were estimated as 3,000,000 STB. The C37 M Eocene flow test will be assessed within this context and that of the cumulative field data set.
Further well deepening, of 200-250m, will pass through the lower M Eocene and Palaeocene (Lower Eocene absent due to erosion or non-deposition) into the Upper Cretaceous, to test the fluid content of an inferred U Cretaceous limestone sequence capping the volcanic sub-basement high. If I am correct in my 07.05.2019 post of concluding, that it is this sequence to which the dimensions of a “3sq km x 100m max thickness” applies, then it is possible to assess the potential quantitative resource this could theoretically produce.
A 3sq km x 100m max thickness limestone capping, assuming it tapers to zero at the margins due to post-depositional erosion, would have a volume of approx. 3,000,000 x 50m = 150,000,000 cu m.
Assuming 10% porosity (low primary but high secondary porosity due to dolomitization and open fracture systems which locally can produce up to 30% porosity) and 50% recovery (based on data for N Caucasus U Cretaceous), that would produce a fluid volume of 5% ie 7,500,000 cu m..
1 cu m = 6.29 bbl
7,500,000 cu m x 6.29 = 47,175,000 bbl. (additional to current 2P reserves of 31.7Mbbl).
To be continued.