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

Accumulation Number: 24EVANS SHOALORIGINAL OPERATOR:BHP Petroleum Pty LtdTYPE:GasSTATUS:Other DiscoveryLOCATION:300 km north-northwest of DarwinSTATE:Northern TerritoryORIGINAL TITLE(S):NT/P40BASIN:BonaparteSUB-BASIN:Sahul Platform/Malita GrabenDISCOVERY WELL:Evans Shoal-1Longitude (E): 129.5320Latitude (S): -10.0815Date total depth reached: 18 AUG 88Water depth:110 mKelly bushing:17.7 mOperator:BHP Petroleum Pty LtdTotal Depth:3,712 mKBNUMBER OF WELLS DRILLED: 2STRUCTURE/TRAP:Broad, faulted anticlinal feature. Eastern flank of thestructure is fault dependent.VERTICAL CLOSURE:260 m (at top of middle Jurassic horizon)RESERVOIR UNITS: 1BOTTOM HOLE TEMPERATURE: 170 o C @ 3,700 mKBPETROLEUM BEARING UNIT No.1: Troughton GroupCONTENTS:GasFORMATION:Plover FormationAGE:Middle Jurassic (Bathonian to Callovian)LITHOLOGY:Sandstone, clear to pale grey or fawn, friable to hard, veryfine to occasionally coarse grained, quartzose, commoncarbonaceous material and pyrite, rare glauconite,abundant quartz overgrowths, interbedded with minordark grey to black claystone and silty claystone.DEPOSITIONAL ENVIRONMENT: Delta plain to marginal marine.FORMATION TOP (mKB):3,453 mKBGROSS HYDROCARBON COLUMN: 169.5 m + (complete reservoir section not penetrated)NET PAY:33.7 mNET TO GROSS RATIO: 20%GAS SATURATION: 88%POROSITY:Up to 12% (8.3% average log porosity)1.7-2.5% from core (3,709-3,712 mKB)PERMEABILITY:0.01-1.0 mD from core (3,709-3,712 mKB)TEST DATA FROM THE DISCOVERY WELL (Evans Shoal-1):RFT 1, 3,554 m,Recovered 12.9 m 3 of gas and a quantityof mud filtrate with a black oil scum.RFT 7, 3,613.8 m,Recovered 0.07 m 3 of gas and a quantityof mud filtrate with a black oil scum.Plover FormationPlover Formation