PARIS, May 6, 2010 /PRNewswire/ --

- 2010 Q1 sales of EUR48.9m - Entitlement of 7,942 bopd (9,114 boepd including Venezuela) - Success of OMGW-201 well 2010 first quarter activity Sales: EUR48.9m - Oil production: EUR33.5m - Oil-related services: EUR23.5m - Oil hedging: EUR(8.1)m Production Development - Testing started on the OMGW-101 well on 15 March 2010 - Success of OMGW-201 well after testing began on 24 April 2010 - Testing started on the OMBG-1 well on 14 April 2010 - EDA obtained for the Banio field (92.5%) - Production to start up again in Nigeria (acquisition in progress) Exploration Appraisal - PA of M'Bafou and TieTie NE in the Congo - PA of Draco in Syria - Success of OMOC-N-1 well - Confirmation of Kissenda play on the Omoueyi license Acquisitions - Entry into Nigeria - Expansion of the exploration portfolio in Tanzania

2010 first quarter sales in EURm Q1 2010 Q1 2009 Congo 0.0 0.1 Tilapia 0.0 0.1 Kouilou 0.0 0.0 Gabon 33.5 1.0 Banio 1.1 1.0 Onal 26.8 0.0 Omko 5.6 0.0 Omgw 0.0 0.0 Tanzania 0.1 0.0 Mnazi Bay 0.1 0.0 Oil production 33.5 1.0 NA Oil-related services 23.5 26.3 -11% Other -8.1 0.0 TOTAL 48.9 27.3 79%

The Group's sales for first quarter 2010 amounted to EUR48.9m compared with EUR27.3m for first quarter 2009.

Change in accounting method regarding the treatment of the oil portion that corresponds to the corporate income tax included in profit oil.

As of 1 January 2010, corporate income tax paid in kind to the State is recorded in the Group's accounts, generating an equivalent increase in sales. This is the first time this tax, which is included in profit oil paid in kind to the State, has been recorded as such. As no sales were recorded in first quarter 2009, data for this period did not need to be adjusted.

The increase in sales was due to the production start-up of the Onal and Omko fields in Gabon at the end of first quarter 2009. These fields did not start generating sales until the second quarter of 2009.

The Group recorded sales of EUR0.1m for the Mnazi Bay field in Tanzania, of which the Group acquired a 38.22% stake in 2009.

Early in 2009, the Group implemented a hedging policy on oil prices. The average hedge price in first quarter 2010 was $60.2/b, whereas the average price of Brent was $76.2/b. This led to a negative adjustment of EUR8.1m.

Excluding hedging, the average sale price in 2009 was $73.9/b for production from Onal and Omko and $52.0/b for production from Banio.

Caroil's contribution to sales (oil services) in first quarter 2010 was EUR23.5m versus EUR26.3m for the same period in 2009. Expressed in US dollars, Caroil's contribution to sales was US$32.5m.

Caroil's individual company sales in first quarter 2010 were EUR35.1m. Expressed in US dollars, Caroil's individual company sales were US$49.0m.

Caroil generated 66% of its business with customers other than Maurel Prom.

Market Data 2010 2009 Change 3 months 3 months Exchange rate (EUR/US$) 1.38 1.30 +6% US$/EUR exchange rate 0.72 0.77 -6% Brent (US$/b) 76.2 45.7 +67%

For the first 90 days of 2010, the average price of Brent was up 67% compared with the same period in 2009. However, the decline in the American currency had an unfavourable effect on sales, limiting the positive impact of changes in oil prices.

Maurel Prom entitlement: 7,942 bopd.

Following the sale of Hocol Colombia in 2009, Maurel Prom's production was generated exclusively by its assets in Gabon.

The table below, in barrels per day, indicates production data based on taxes and fields in production.

2009 Gross Maurel Entitlement Production production Prom sold from the Working fields Interest (WI) in boepd Q1 2010 Q1 2010 Q1 2010 Q1 2010 Gabon 10,498 8,977 7,942 6,543 Banio 100% up to 12 March, 92.5% thereafter* 354 354 354 306 Onal 85% 8,534 7,254 6,383 5,158 Omko 85% 1,610 1,369 1,205 1,079 Omgw 100% 156 156 138 - Sub-total 10,498 8,977 7,942 6,543 Venezuela 26.35% 5,257 1,385 1,172 1,172 Total Group 15,755 10,362 9,114 7 ,715

*Assuming Tulip Oil increase of 7.5%

Oil and gas production in Venezuela, net of a 30%-deduction in kind on oil, was 1,172 barrels per day equivalent for first quarter 2010. Oil represented 51% of gross production. This activity is not included in the Group's sales.

Three oil extractions were carried out in January and February for production from the Onal and Omko fields and one in February for production from the Banio field. This accounts for the difference between entitlement of 7,942 bopd and production actually sold of 6,543 bopd.

Following the long-term testing of the Banio-2 well, which showed stabilised production of 400 bopd, the Group requested and obtained on 12 March 2010 an Exclusive Development Authorisation for the Banio field. To date, only the Banio-2 well is in production. The Group is currently drilling the Banio-5 well, the results of which will be known within a few weeks.

Following the discovery of the Gwedidi field to the northeast of Onal, the Group began work in first quarter 2010 to link the OMGW-101 well to the Onal production centre. This well went into production on 15 March 2010. The pipeline connecting the Gwedidi field to Onal was laid in such a way as to run through the M'Bigou field, whose discovery well OMBG-1, drilled in August 2008, was tested flowing with 700 b/d in the upper Gres de Base. Testing on the OMBG-1 well began on 14 April 2010.

The OMGW-201 well, located at the northernmost end of the Gwedidi field, was successfully drilled in April 2010. Testing began on 24 April 2010.

The Onal, Omko, M'Bigou and Gwedidi fields today produce 12,000 bopd at 100%. This level is set to increase as a result of more water injection, the completion of work on wells in production and the drilling of additional wells in the Gwedidi and M'Bigou fields.

It should be noted, however, that the strict application of administrative procedures for customs clearance in Gabon can cause delays in the delivery of the operating and well-drilling equipment needed for these fields.

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This press release may contain forward-looking statements with respect to the financial position, results of operations, business, strategy and plans of Maurel Prom. By their nature, forward-looking statements involve risks and uncertainties because they relate to events and depend on circumstances that will or may occur in the future. These forward-looking statements are based on assumptions which we believe are reasonable but that could ultimately prove inaccurate and are subject to a number of risk factors, including but not limited to price fluctuations in crude oil; exchange rate fluctuations; uncertainties inherent in estimating quantities of oil reserves; actual future production rates and associated costs; operational problems; political stability; changes in laws and governmental regulations; wars and acts of terrorism or sabotage.

Maurel Prom is listed for trading on Euronext Paris - Compartment A - CAC mid 100 Index Isin FR0000051070 / Bloomberg MAU.FP / Reuters MAUP.PA Upcoming meetings: 20/05/2010 Shareholders' Meeting Communication: INFLUENCES +33(0)1-42-72-46-76


CONTACT: Communication: INFLUENCES, +33(0)1-42-72-46-76,