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

Accumulation Number: 63TERNORIGINAL OPERATOR:Arco Australia LtdTYPE:GasSTATUS:Other DiscoveryLOCATION:310 km west-southwest of DarwinSTATE:Western AustraliaORIGINAL TITLE(S):WA-18-PBASIN:BonaparteSUB-BASIN:Petrel Sub-basinDISCOVERY WELL:Tern-1 (Tern Member gas pool)Longitude (E): 128.0647Latitude (S): -13.2208Date total depth reached: 04 JUL 71Water Depth:92 mKelly bushing:11.9 mOperator:Arco Australia LtdTotal Depth:4,352 mKBDISCOVERY WELL:Tern-4 (Cape Hay Member gas pool)Longitude (E): 128.1059Latitude (S): -13.2298Date total depth reached: 13 NOV 94Water Depth:91.8 mKelly bushing:22.5 mOperator:Santos LtdTotal Depth:2,700 mKBNUMBER OF WELLS DRILLED: 5STRUCTURE/TRAP:Northwest-southeast oriented anticline resulting from saltwithdrawal from the flanks of the structure.AREAL CLOSURE:54 km 2 (near top of the Late Permian)VERTICAL CLOSURE:76 m (at Late Permian level)RESERVOIR UNITS: 2CONDENSATE GRAVITY:50.5 o APILOWEST KNOWN GAS:2,567.8 mSS (Tern Member Pool, Tern-2)PETROLEUM BEARING UNIT No.1: Tern Member (Tern-1)CONTENTS:GasFORMATION:Hyland Bay FormationAGE:Late PermianLITHOLOGY:Coarsening upwards sequence. Fine to medium grained,bioturbated sandstone at the base, overlain by ‘shelly’coarse grained sandstones.DEPOSITIONAL ENVIRONMENT: Barrier bar.FORMATION TOP (mKB):2,542 m (Tern-4)GROSS HYDROCARBON COLUMN: 31.5 m (2,543.5-2,575 mKB, Tern-4)NET PAY:5.9 m (Tern-4)NET TO GROSS RATIO: 19%HYDROCARBON SATURATION: 51%RESERVOIR PRESSURE:3,668 psia (2,573 mKB, Tern-4)RESERVOIR TEMPERATURE: 95 o C (2,573 mKB, Tern-4)POROSITY:Up to 26%. The best porosity is preserved in the basalsandstone where silicification of the reservoir is lessextensive.