Origin Energy provides a final report on the Riverslea Southeast 1 oil exploration well operated by the company and its subsidiaries.



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Riverslea Southeast 1

Well type:
Oil Exploration Well

Location:
Surat Basin, Queensland (PL 30)

Riverslea Southeast 1 surface location is approximately 1.4 km southeast of the Riverslea Oil Field.

Latitude: 27o 21’ 19.39” S
Longitude: 148o 45’ 14.42” E

Interests in PL30:
Angari Pty Ltd* 55.0%
Origin Energy CSG Ltd* 20.0%
Santos (BOL) Pty Ltd# 7.5%
Bridge Oil Exp Pty Ltd# 7.5%
Mosaic Oil NL 10.0%

*a wholly owned subsidiary of Origin Energy Limited
#a wholly owned subsidiary of Santos Limited

Interests in the Well:
Angari Pty Ltd* 64.7%
Origin Energy CSG Ltd* 23.5%
Santos (BOL) Pty Ltd# 0%
Bridge Oil Exp Pty Ltd# 0%
Mosaic Oil NL 11.8%

*a wholly owned subsidiary of Origin Energy Limited
#a wholly owned subsidiary of Santos Limited, Non-Participant in this well

Objective:
Primary target:
Boxvale Sandstone
Secondary targets:
Basal Evergreen Formation
Moolayember Formation
Proposed total depth:
1,625 metres measured depth

The well is a structural test of the Boxvale Sandstone, the main oil-producing reservoir on the western flank of the Surat Basin.

Progress and Status:
The well commenced drilling on 10 February 2008 with the Mitchell 152 drilling rig. The 311 millimetre (12-1/4 inch) surface section was drilled to a depth of 195 metres measured depth and 244 millimetres (9-5/8 inch) surface casing has been set at 192 metres measured depth. The 216 millimetre (8-1/2 inch) production wellbore was drilled to a total depth of 1,585 metres measured depth on 16 February.

Riverslea Southeast 1 encountered weak oil shows in poorly developed reservoirs of the upper Boxvale Sandstone. Wireline logs were acquired and the well will be plugged and abandoned.

For further information contact:
Paul Zealand
General Manager Exploration & Production
Origin Energy
Phone: (07) 3858 0681
Email: paul.zealand@originenergy.com.au


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