Origin Confirms New Bass Basin Discovery

Origin Energy, on behalf of the T/18P Joint Venture, advised that as at 6 a.m. EDT on Monday, the current operation at Rockhopper 1 was running wireline logs.

Wireline pressure data recorded in the well to date confirm the presence of multiple hydrocarbon columns in a sequence of interbedded sands and shales in the Lower Eastern View Coal Measures. Selective wireline sampling has recovered oil from some sands and liquids rich gas from others. Thickness of individual sand beds varies from 1 meter to around to 5 meters. Reservoir quality appears to be variable.

As no definitive water bearing sands are present in the target section, the Joint Venture is contemplating drilling a sidetrack to a downflank location on the Rockhopper structure to establish hydrocarbon column heights.

It remains too early to comment on the commercial significance of this new field discovery, but the JV is encouraged by results to date, particularly by the recovery of crude oil from some sands.

Rockhopper 1 is an exploration well located in exploration permit T/18P, operated by Origin some 38km west of the Yolla gas field and approximately 10km north-north-east of Trefoil 1.

Rockhopper 1 is a deviated well. The final surface location is:

Latitude: 39° 47' 34.1828" S
Longitude: 145° 26' 21.4660" E

T/18P Participating Interests


Origin Energy Resources Ltd*	39.0% (Operator)
AWE Ltd	47.5%
CalEnergy Gas (Australia) Ltd	8.5%
Innamincka Petroleum Ltd	5.0%
* a wholly owned subsidiary of Origin Energy Limited 

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