DECEMBER 2005 - STOCK EXCHANGE RELEASES
ACTIVITY UPDATE - ANGOLAN SEISMIC SURVEY AND 2006 BUDGET: (30-12-2005)



Roc Oil (Cabinda) Company, a wholly owned subsidiary of ROC, is pleased to advise that the processing and initial interpretation of the 162 sq km 3D and 505 km 2D seismic acquired in the Cabinda South Block, onshore Angola, between June and November 2005 continues to yield encouraging results with numerous prospects and leads and several different play concepts being identified.

As a consequence of the seismic data processed and interpreted to date, the ROC-operated Cabinda South Joint Venture has agreed to accelerate the exploration programme through 2006 with the intention of drilling the first of an initial programme of three exploration wells in September, 2006. In this context, the 2006 budget exploration expenditure for the Cabinda South Block is expected to be in the order of US$45million of which ROC will contribute about US$34 million/A$45 million.

 

Commenting on the implications of the seismic data, ROC's Chief Executive Officer Dr John Doran stated that:

"Although interpretation is still at a preliminary stage, the seismic reviewed to date has confirmed onshore Angola in the pole position within ROC's exploration portfolio, as evidenced by the greatly accelerated 2006 work programme."



The Cabinda South Joint Venture comprises:

ROC (Operator) . . . . . . . . 60% Working Interest (75% contributing interest)*
Force Petroleum Limited . . . .20% Working Interest (25% Contributing Interest)
Sonangol . . . . . . . . . . . .. .20% Working Interest

*ROC's interests are held through two wholly owned subsidiary companies: Roc Oil (Cabinda) Company (45% WI) and Lacula Oil Company Limited (15% WI).


Michelle Manook
General Manager – Corporate Affairs
E-mail:
mmanook@rocoil.com.au

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DRILLING ACTIVITY UPDATE
ZOULÉ-1 EXPLORATION WELL, OFFSHORE MAURITANIA:
(28-12-2005)



ROC advises that on 25 December, the "Stena Tay" drilling rig commenced drilling the Zoulé-1 exploration well. As at midnight, 27 December 2005, (local time), the well had drilled 18½ inch hole to 1,619 metres where the 133/8 inch casing was being run and cemented.

Zoulé-1, which is targeting Cretaceous channel sands, is located in 782 metres of water and has a proposed Total Depth of 3,730 metres. The well is approximately 78 km from shore, 130 km north of the Chinguetti Oil Field and 27 km south-east of Pelican-1, a Cretaceous gas discovery drilled in Block 7 in late 2003 in which ROC has a 4.950% interest.


The Joint Venture Interests in Block 1 are:

.... . . . .... . . . .... . . . .... . . . .... . . . ... . . . Equity
Woodside Mauritania Pty Ltd (Operator).... . . . 37.578%
Petronas Carigali Overseas Sdn Bhd . . . .. . . . .35.000%
Hardman Petroleum ( Mauritania ) Pty Ltd . . .. .18.422%
Planet Oil ( Mauritania ) Limited . ... ... ... ... ... .4.000%
Roc Oil (Mauritania) Company................... . 5.0%



Michelle Manook
General Manager – Corporate Affairs
E-mail:
mmanook@rocoil.com.au

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MAURITANIA OFFSHORE DRILLING UPDATE: (23-12-2005)



ROC advises that the following release was made earlier today by Woodside Petroleum Ltd:

“Woodside Petroleum Ltd reports the following activity by its wholly-owned subsidiaries, Woodside Mauritania Pty. Ltd. and WEL Mauritania B.V., offshore Mauritania since the last report issued (by Woodside) on 22 November 2005..



PSC Area C, Block 6: Zoulé-1 Exploration Well

The ‘Stena Tay’ drill rig is expected to resume exploration drilling for Woodside operated joint ventures in Mauritania next week.

The next well to be drilled will be the Zoulé-1 exploration well in PSC Area C, Block 6. The well will target a Cretaceous objective and has a planned total depth of approximately 3730 metres.

Following Zoulé-1, the Doré-1 exploration well will be drilled in PSC Area B to target late Paleogene and early Miocene objectives.

Woodside anticipates issuing the next Mauritania Offshore Drilling Update on 3 January 2006 unless it is necessary to issue an earlier release to comply with its continuous disclosure obligations under the ASX Listing Rules.


General

All reported drilling depths are referenced to the rig rotary table and all times are Universal Time (UTC) (Mauritanian time).

The locations of planned exploration wells and the Chinguetti Oil Field are shown on the attached map."



Participating Interests in the Chinguetti Joint Venture and relevant PSC areas are:

 

Company............................... . . . . Chinguetti Joint Venture . . . .. . . PSC-A . . . .. . . PSC-B . . . ..PSC-C, Block 6
Woodside group companies (Operator)....... . . . .47.38448%....... . . . . . .. 53.846%.... . ....53.846%.... . . . ..37.578%
Hardman.group companies........ . . . . . .. . . . . 19.00800%....... . . . . . . . 24.3%.... . . . . ..21.6%.... . . . .....22.422%
Groupe Project Chinguetti........ . . . . . .. . . . . 12.00000%....... . . . . . . . .. -- ... . . . . . . . ..-- .... . . . .. . . . ..--
BG group companies........ . . . . . .. . . . . . . .. . 10.23440%....... . . . . . . .13.084%............11.63% ........ . . . . .--
Premier group companies........................ . . . . 8.12328%....... . . . . . . . .. --.......... . .. ..9.231% ........ . . . . .--
Roc Oil group companies . . .. . . . . . . . . . . . 3.24984% . . .. . . . . . . 4.155% . . .. . . 3.693% . . .. . . . . 5.0%
Fusion group companies
....... . . . . . . .. . . . .. . . ..--....... . . . . ... . . . .. 4.615%.... . . . ......--.... . . . . . .. .....--
Petronas Carigali Overseas Sdn Bhd....... . . . . . . . .--....... . . . . . . . . . . .. --.... . ... . . .. ... --.... . . . .. . ..35.0%


Michelle Manook
General Manager – Corporate Affairs
E-mail:
mmanook@rocoil.com.au

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DRILLING ACTIVITY UPDATE
FAUCON-1 EXPLORATION WELL, OFFSHORE MAURITANIA:
(20-12-2005)



ROC advises that since the Company’s last "Drilling Activity Update" on 13 December, 2005, the "Stena Tay" drilling rig has drilled Faucon-1 a further 496 metres to a Total Depth of 4,170 metres without encountering any significant hydrocarbons. The current operation is preparing to plug and abandon the well as a regionally significant but sub-commercial, discovery.

Therefore, the main outcome of the drilling of Faucon-1 remains as reported last week: it encountered two hydrocarbon-bearing sandstones some 150 metres apart. The upper sandstone is gas-bearing and four metres thick while the lower 40 metres thick sandstone has a 10 metre interval at the top of it which appears to contain light oil or liquids-rich gas-condensate. The composition of the hydrocarbon fluid cannot be finally determined until the downhole pressurised fluid samples recovered from the well have been fully analysed in an onshore laboratory.

Faucon-1 is located in 1,162 metres of water, 140 km south of the Chinguetti Oil Field.


Commenting on the Faucon-1 results, ROC’s CEO John Doran said:

"Any time you find net hydrocarbon pay in the Cretaceous in a previously undrilled area 140 km from Chinguetti, you have to be encouraged. Exploration offshore Mauritania is still in its infancy: more than 14 million acres/50,000 sq km; barely scratched by the drill bit."

 

The Joint Venture Interests in Block 1 are:

.... . . . .... . . . .... . . . .... . . . .... . . . ... . . . Equity
Dana Petroleum (E&P) Limited (Operator).... . . . 36.0%
Gaz de France UK B.V. . . . .. . . . . . .. . . . . . ..24.0%*
Tullow Oil . . . . . .. . . . . . . . . . .. . . . . . . . . 20.0%
Hardman Petroleum (Mauritania) Pty Limited . .. 18.0%
Roc Oil (Mauritania) Company................... . 2.0%

* Subject to farmin from Dana


Michelle Manook
General Manager – Corporate Affairs
E-mail:
mmanook@rocoil.com.au

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DRILLING ACTIVITY UPDATE
FAUCON-1 EXPLORATION WELL, OFFSHORE MAURITANIA:
(13-12-2005)



ROC advises that since the Company’s last “Drilling Activity Update” on 6 December, 2005, the “Stena Tay” drilling rig has continued operations on the Faucon-1 exploration well in Block 1, offshore Mauritania.

 

During the week the well drilled an 8½” hole from 3,536 metres to the current depth of 3,674 metres. Due to increasing formation pressure it was decided to run a 7” liner and this has now been cemented in place. The current operation is preparing to drill ahead in 6” hole to the planned total depth of 4,237 metres.

An intermediate logging programme was completed over the Upper Cretaceous interval, above 3,536 metres. This included reservoir pressure measurements and reservoir fluid sampling. Initial interpretation of the data collected indicates the presence of two hydrocarbon bearing sandstones, some 150 metres apart. The lower sandstone has a gross thickness of approximately 40 metres of which the upper 10 metres contains a hydrocarbon which appears to be a light oil or a liquids rich gas-condensate. The upper sandstone is approximately four metres thick and is currently interpreted to be gas bearing. The precise composition of the hydrocarbon fluids recovered from both zones will not be finally determined until the fluid samples have been fully analysed in an onshore laboratory.

The logged interval appears to correspond to an upper reservoir target objective and there is potential for other sands to be encountered in the > 500 metre section which is yet to be drilled.


Faucon-1 is located in 1,162 metres of water, 140 km south of the Chinguetti Oil Field.

 

The Joint Venture Interests in Block 1 are:

.... . . . .... . . . .... . . . .... . . . .... . . . ... . . . Equity
Dana Petroleum (E&P) Limited (Operator).... . . . 36.0%
Gaz de France UK B.V. . . . .. . . . . . .. . . . . . ..24.0%*
Tullow Oil . . . . . .. . . . . . . . . . .. . . . . . . . . 20.0%
Hardman Petroleum (Mauritania) Pty Limited . .. 18.0%
Roc Oil (Mauritania) Company................... . 2.0%

* Subject to farmin from Dana


Michelle Manook
General Manager – Corporate Affairs
E-mail:
mmanook@rocoil.com.au

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DRILLING ACTIVITY UPDATE
FAUCON-1 EXPLORATION WELL, OFFSHORE MAURITANIA:
(06-12-2005)



ROC advises that preliminary interpretation of drilling data and wireline log information obtained while drilling, indicates that the Faucon-1 exploration well, currently being drilled in Block 1, offshore Mauritania, has encountered hydrocarbon-bearing sandstones within the main Cretaceous target zone.

 

Drilling has been temporarily suspended at 3,536 m while additional wireline logs, formation pressures, fluid and core samples are obtained. Thereafter, it is intended that the well be deepened by up to a further 700 m in order to fully explore the Cretaceous section. Once the additional wireline information has been obtained and evaluated a further announcement will be made regarding hydrocarbon type encountered and the likely significance of the accumulation.


Faucon-1 is located in 1,162 m of water, 140 km south of the Chinguetti Oil Field.

 

The Joint Venture Interests in Block 1 are:


Dana Petroleum (E&P) Limited (Operator).... . . . 36.0%
Gaz de France UK B.V. . . . .. . . . . . .. . . . . . ..24.0%*
Tullow Oil . . . . . .. . . . . . . . . . .. . . . . . . . . 20.0%
Hardman Petroleum (Mauritania) Pty Limited . .. 18.0%
Roc Oil (Mauritania) Company................... . 2.0%

* Subject to farmin from Dana


Michelle Manook
General Manager – Corporate Affairs
E-mail:
mmanook@rocoil.com.au

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