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

TEST DATA FROM THE DISCOVERY WELL (Swan-1):RFT, 2,364 m,Recovered 2.06 m 3 of gas, 625 cc ofcondensate and 3.175 litres of muddywater.RFT, 2,398 m,Recovered 0.017 m 3 of gas and 21.5litres of muddy water.RFT, 3,231 m,Recovered 22 litres of mud.RFT, 3,258 m,Recovered 22 litres of mud.Puffin FormationPuffin FormationPlover FormationPlover FormationAPPRAISAL AND DEVELOPMENT DRILLING :Swan-2 encountered wet gas shows between 2,248 mKB and 2,335 mKB (P3 sand) within the UpperCretaceous. Gas shows were also recorded in thin sands or fractures around 3,341 mKB in the UpperJurassic to Oxfordian section. The well was plugged and abandoned at 4,064 mKB in overpressuredOxfordian shales.Swan-3 was drilled to test the reservoir potential of the P3 reservoir intersected in Swan-2. The P3 sandwas not encountered in this well. Instead, a shaley, water saturated sandstone (P4 sand) was intersectedat the base of the Puffin Formation and a 26 m gross gas column was encountered in the P1 and P2sands between 2,306 mKB and 2,332 mKB (19.4 m net pay). The well was plugged back and kicked offat 1,824 mKB as Swan-3ST-1 in an endeavour to intersect the P3 reservoir.Swan-3ST-1 intersected a 33 m gross gas column (18.2 m net gas pay) between 2,342 mKB and 2,375mKB in the P1 and P2 reservoirs. 14.3 m of net gas sand was identified in the P3 reservoir. No gas/oilor gas/water contacts were identified and the well was plugged and abandoned.RESERVES:Oil:Gas:5 MMbbls70 BCFSource: Northern Territory Department of Business Industry and Resource Development,1997.REMARKS:In Swan-1, thin, possibly gas bearing sandstones were identified on logs in the Late Jurassic section.RFT testing showed these sandstones were tight.The drilling of the Swan-3 well indicates that the accumulation at Swan is probably a singleaccumulation of stacked sands, although no proven gas/oil or gas/water contacts have been identified.Whole extract analysis on sidewall cores taken in the Swan-3 well indicates residual oil is present in allthe gas bearing sandstones encountered at Swan. It is thought that an initial oil accumulation at Swanhas been displaced by gas, resulting in residual oil in a gas/condensate accumulation. RFT pressure datafrom the Swan-3 well suggest the possibility of an oil leg downdip from Swan-3.