At Matuku the Tikorangi Formation certainly looks to have the...

At Matuku the Tikorangi Formation certainly looks to have the potential to be something worthwhile so long as the rock is fractured. One explanation for the lost 5 days could be that maybe they lost circulation while drilling the Tikorangi section and then had a bit of bother or indeed decided to take a closer look. Recall how the Waihapa 1-B discovery well for the Waihapa Field was only made some years after the original P&A. This by reentry [prompted by study of the well logs; as I recall, the original well had large circulation loss in the Tikorangi] and testing of the Tikorangi Formation. After perforation of the casing the well flowed at over 5000 bopd. Here at Matuku there is a history of compressive thrusting from the east so on the face of it there may be reasonable likelihood that the limestone is fractured:

http://www.sciencelearn.org.nz/Contexts/A-Fizzy-Rock/Sci-Media/Images/Core-sample-from-the-Tikorangi-limestone