COMPOSITIONAL DATA : GAS : GAS PROPERTIES Puffin Fm RFT ...

APPRAISAL AND DEVELOPMENT DRILLING :Petrel-1A was drilled as a directional relief well to control the gas blowout that occurred while drillingPetrel-1.Petrel-2 was drilled 5.2 km to the southeast of Petrel-1A. The first measured gas flow from the Petrelaccumulation occured in this well. Here, DST 6 taken at around 3,658 mKB, flowed gas at 263,350m 3 /day from the ‘Middle Sandstone Zone’ of the Cape Hay Member.Petrel-3, drilled 15.6 km to the southeast of Petrel-1A on the southern nose of the Petrel anticline wascased and suspended as a possible future gas producer.Petrel-4 drilled 6.8 km south-southeast of Petrel-1A, structurally updip from Petrel-3, was cased andsuspended as a possible future gas producer.Petrel-5 recorded the highest gas flow on test from the Petrel accumulation. In this well, gas flowed at979,760 m 3 /day and condensate at 19 bbls/day through a 25.4 mm choke from a sandstone near the topof the Cape Hay Member. The well was plugged and abandoned as it was not considered to be in anoptimal position for field development.Petrel-6, drilled 3.8 km northwest of Petrel-1A in a crestal position was plugged and abandoned afterfailing to encounter reservoir quality sandstones above the highest known water.RESERVES:Gas:535 BCFSource: Northern Territory Department of Business Industry and Resource Development,1997.REMARKS:In Petrel-1, gas from a drilling break encountered between 3,978.2 mKB and 3,979.8 mKB in the HylandBay Formation blew out. The gas blowout burned at a slowly diminishing rate over a 16 month perioduntil a directional relief well (Petrel-1A) was drilled.At date of publication, the Petrel accumulation was held under Retention Lease NT/RL1 and RetentionLease WA-6-R.