Drilling Update - Jacala-1

Roc Oil Company Limited
20 April 2006



20 April 2006


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


                    EXPLORATION DRILLING UPDATE: JACALA - 1


ROC advises that further to its Exploration Drilling Update of 19 April 2006,
preliminary interpretation of log data indicates that hydrocarbons are not
present at the primary objective for Jacala-1, WA-351-P, Carnarvon Basin,
Offshore Western Australia.

Following completion of the evaluation programme the well will be plugged and
abandoned.

The WA-351-P Joint Venture comprises:

BHP Billiton Petroleum (North West Shelf) Pty Ltd     55% & Operator
Tap (Shelfal) Pty Ltd                                 25%
Roc Oil (WA) Pty Ltd                                  20%



Michelle Manook                          For further information please contact:
General Manager - Corporate Affairs                             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]
                                                       Fax:  [phone]
                                                     Email:  [e-mail]
 
                                                                    Nick Lambert
                                            Bell Pottinger Corporate & Financial
                                                       Tel:  [phone]



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