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

Accumulation Number: 11BUFFALOORIGINAL OPERATOR:BHP Petroleum (Northwest Shelf) Pty LtdTYPE:OilSTATUS:ProducerLOCATION:550 km west-northwest of DarwinSTATE:Western AustraliaORIGINAL TITLE(S):WA-260-PBASIN:BonaparteSUB-BASIN:Laminaria High, Sahul PlatformDISCOVERY WELL:Buffalo-1Longitude (E): 126.0974Latitude (S): -10.6728Date total depth reached: 27 SEP 96Water Depth:27.3 mKelly bushing:28.3 mOperator:BHP Petroleum (Northwest Shelf) Pty LtdTotal Depth:3,473 mKBNUMBER OF WELLS DRILLED: 2STRUCTURE/TRAP:Faulted horst block with some internal four-way-dipclosure.RESERVOIR UNITS: 1OIL GRAVITY:53 o APIGAS TO OIL RATIO:126 scf/stbPETROLEUM BEARING UNIT No.1: Elang FormationCONTENTS:OilFORMATION:Elang FormationAGE:Middle Jurassic (Callovian)LITHOLOGY:Stacked sandstones, interbedded with minor argillaceoussiltstones, silty claystones and claystone. Sandstone: verylight grey to yellowish grey to light olive grey, very fine tofine, medium to carse grained, well sorted, commonlyunconsolidated, friable with minor pyritic matrix and weaksiliceous cement.DEPOSITIONAL ENVIRONMENT:: Stacked distributary channels deposited in an estuarineenvironment superposed upon a sequence of stacked mouthand transverse bars.GROSS HYDROCARBON COLUMN: 45.1 m (3,301 – 3,346.1 mRT)NET PAY:32 mNET TO GROSS RATIO: 72%HYDROCARBON SATURATION: 77%OIL/WATER CONTACT:3,323.4 mTVDSS (free water level from MDT data)POROSITY:12% (average log porosity)PERMEABILITY:378 mD (average from core)TEST DATA FROM THE DISCOVERY WELL (Buffalo-1):DST (CASED) 1, 3,307-3,335 m,Flowed 53 o API oil at 11,800 bbls/dayand gas at 328,500 m 3 /day through a20.6 mm choke.Elang Formation