Done some detective work and found the following - which if Royston is analogous to the Carapal Ridge gas discovery - we should expect to similar porosity, condensates etc... from the Royston Herrera test results.
What makes me excited now is that at Carapal Ridge the 7bc was oil bearing..............which means, we might see the lower Herrera 7bc at Royston being oil bearing, with the upper Herrera 7a being gas/condensate. Mmmmmmm I am even more excited now - might we have oil down below in the 7bc and gas condensate upper 7a.
Lets not forget the drill stopped in the 7bc in pay.........which means we might have the 1TCF of gas in the upper 7a and then a few hundred millions of barrels of oil in the lower 7bc........with the potential billion barrel Krakken still to be drilled below that. Also note BG never found a water/gas contact or oil/water contact. This all bodes extremely well and exciting.
So we are looking for around 17% (0.17) (plus or minus a couple of points) porosity from Royston-1.
The Carapal Ridge field was discovered by the Carapal Ridge-1 well, the first well to penetrate the Carapal Ridge thrust sheet. The Carapal Ridge-1 exploration well is currently the only well within the field and has been completed as a producer. The well is producing 20mmscfd from a 678ft interval (6568ft - 7246ft) within the Herrera Member sandstones of Mid Miocene age.
The Carapal Ridge-1 well encountered a 937ft continuous column of gas condensate pay within a single thrust sheet of good quality Herrera Member sandstones. Herrera sandstones have an average porosity of 17% and a net-to-gross of 58% within the pay interval. The sands consist predominantly of stacked upwards fining and blocky proximal turbidite channels and lobes. FMI and dipmeter data confirm low angle amalgamated sand bodies.
The Carapal Ridge fluid is a rich retrograde / gas condensate with an initial CGR variable from 50 to 22 bbl/mmscf. Top Herrera sandstone is at a depth of 6568ft. A gas water contact was not encountered in the well. The proven gas column is down to 7505ft and is based on log and test data and coincides with a complex basal imbricate thrust system. Below the basal imbricate thrust system the well penetrated a lower Herrera thrust sheet, referred to as the underthrust play. DST 1 encountered oil in the underthrust play. The well drilled to a total depth of 8829ft within the Herrera Member sandstones.
