Ann: Dorado-2 Drilling Update, page-37

Boz,

The trap was shown from the original diagram ahown last year. They can see that from the original 3d seismic. What we did last year, was to drill down there to see if they trap hydrocarbons (oil, condensate and gas).

That was last year.

Now, we are testing to see how far out (on this occasion it was 2.2km out) it is filled with oil and whether the porosity and permeability is as good as D1. That way, we can get a better measurement on the volume of oil and gas contained within this trap. Poking one hole in the structure is Not enough - usually you need to poke another 3 holes within the trap (at a minimum) to determine the volume and recovery factor of this trap.

That is why we have a contingent D4.

These appraisal wells are all about fine tuning the volume and recovery factor (porosity and permeability) over this trap, so we can build the optimal structure to extract them.