Exploration: Onshore Angola

Roc Oil Company Limited
07 August 2007


7 August 2007

                         ROC OIL COMPANY LIMITED ('ROC')
                             STOCK EXCHANGE RELEASE

                     ACTIVITY UPDATE: EXPLORATION DRILLING,
                         ONSHORE ANGOLA - MASSAMBALA-1

Roc Oil (Cabinda) Company, a wholly owned subsidiary of ROC, advises that as of
0600 hours on 6 August 2007 (local time), the ROC-owned 'Explorer' rig had
directionally drilled the Massambala-1 exploration well in the Cabinda South
Block, onshore Angola, to final Total Depth of 2,192 metres below rotary table
('mBRT') and completed wireline logging. The current operation at the well is
preparing to drill a shallow side track hole.

Current interpretation of the results of the drilling and wireline logging
programme suggest that:

  • The main zone of interest in Massambala-1 lies between 394 mBRT and 433
    mBRT where good oil shows were observed over a gross interval of 39 metres.
    Of particular interest are anomalous log responses, which could be
    interpreted as indicating moveable hydrocarbon, over a 20 metre gross
    interval within the zone of good oil shows. Other minor log anomalies exist
    above and below this zone, but do not coincide with oil shows. The 20 metre
    interval of most interest exhibits good to excellent potential reservoir
    quality with 18 metres (90%) net sand with an average porosity of about 27%.
    However, wireline sampling did not recover any oil from this zone of
    interest which, when combined with pressure gradient measurements, raises
    the spectre that the zone represents a heavy oil accumulation or, possibly,
    a residual oil column.

  • The well's primary pre-drill target had no indications of hydrocarbons.

The forward programme at Massambala-1 is to plug the well back and sidetrack in
order to core the shallow zone of interest referred to above. This operation is
expected to be completed within two weeks.

After drilling operations at Massambala-1 are complete, the rig will move to
drill Cevada-1 in the eastern part of the Block.

Consistent with the most recent schedule, the Simmons 80 Rig arrived in Cabinda
in late July and is expected to start drilling Soja-1 prior to the end of
August.

Commenting on the results of Massambala-1, ROC's CEO, Dr John Doran, stated
that:

'Because we are at the beginning of a big drilling campaign, it is essential
that we try to nail the exact nature of the shallow oil zone at Massambala-1 as
soon as possible because if it proves to be producible, the upside potential is
well worth chasing.'

Participating Interests in the Cabinda South Block are:

    ROC Group Companies (Operator)     60%
    Force Petroleum Limited            20%
    Sonangol P&P S.A.                  20%

In accordance with ASX and AIM Rules, the information in this Release has been
reviewed and approved by Dr John Doran, Chief Executive Officer, Roc Oil Company
Limited, BSc (Hons) Geology, MSc and PhD. Dr Doran, who is a member of the
Society of Petroleum Engineers, has more than 30 years relevant experience
within the industry and consents to the information in the form and context in
which it appears.

Damian Fisher
General Manager
External Affairs & Investor Relations

                                         For further information please contact:
                                                                Dr John Doran on
                                                            Tel: [phone]
                                                            Fax: [phone]
                                                     Email: [e-mail]
                                       Or visit ROC's website: www.rocoil.com.au

                                                                   Dr Kevin Hird
                                          General Manager - Business Development
                                           Tel: [phone]
                                            Mob: [phone]
                                                      Email: [e-mail]

                                                                    Michael Shaw
                                    Oriel Securities Limited (Nominated Adviser)
                                                        Tel: [phone]




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