Acacia Este Oil Discovery

RNS Number:4324A
Black Rock Oil & Gas PLC
18 July 2007


For immediate release                                               18 July 2007


                            Black Rock Oil & Gas Plc

                           Acacia Este Oil Discovery


On 3 July 2007 Black Rock Oil & Gas Plc ("Black Rock" or the "Company", stock
code: BLR), the AIM-traded oil and gas exploration and production company,
announced that the Acacia Este exploration well in the Las Quinchas Association
Contract in Colombia had been spudded by its joint venture operator, Kappa
Resources Colombia Limited ("Kappa") on Saturday, 30 June 2007 and that drilling
operations were underway.

Acacia Este was drilled to a total depth of 3,970 feet. Fair to good oil shows
were encountered whist drilling the target Lower Mugrosa Formation.

The Board of Black Rock is delighted to announce that preliminary interpretation
of the logs run at total depth indicates oil saturation in good quality porous
sandstones.

These initial results are very encouraging and preparation for testing of the
well has now commenced in order to assess the well's potential productivity.
Results of the testing should be known in approximately 10-20 days time.

Dr John Cubitt, Managing Director of Black Rock Oil & Gas Plc, commented:

"The results of the drilling to date are very encouraging and if the testing
results are positive, Acacia Este could be a highly significant discovery for
Black Rock."


Qualified Person

Dr John Cubitt (a Director of the Company) has been involved in the oil and gas
production industry for more than 26 years. Dr John Cubitt is a registered
Chartered Geologist (CGeol) and has a BSc and PhD in geology. He has compiled,
read and approved the technical disclosure as it relates to Black Rock in this
regulatory announcement.



For further information, please contact:

Black Rock Oil & Gas Plc                                  Tel: [phone]
Dr John Cubitt, Managing Director                         www.blackrockoil.com
Peter Kitson, Finance Director

Beaumont Cornish Limited                                  Tel: [phone]
Michael Cornish

Aquila Financial Limited                                  Tel: [phone]
Peter Reilly



Notes to Editors:


Black Rock Oil & Gas Plc, headquartered in the UK, is an AIM listed (AIM:BLR)
exploration and production company with licences in the Southern Gas Basin of
the UK North Sea and the Middle Magdalena Basin, onshore Colombia.

Colombia:
Black Rock has Joint Ventures with Kappa Resources Colombia Limited (Kappa) in
the Las Quinchas Association Contract and the Alhucema E&P Contract, both
situated in the prolific hydrocarbon basin of the Middle Magdalena Valley.

Operated by Kappa, and following completion of its farm-in obligations, Black
Rock's 50% interest in the Las Quinchas Association Contract is subject only to
approval of the transfer of the interest by the state oil company, Ecopetrol.

The Las Quinchas Block contains the Arce, Bukhara and Baul heavy oilfields and a
number of exploration prospects including the Acacia Este oil discovery. The
Arce oilfield contains heavy oil and is currently undergoing a steam injection
test to determine commerciality and development options.

The Alhucema Block, immediately to the North of the Las Quinchas Block contains
a number of prospects and leads and one well is planned on the Juanes prospect
later in 2007. A 2D seismic programme was undertaken in 2006.


United Kingdom:
Black Rock has a 15% interest in two adjacent license blocks (49/8c and 49/9d)
situated in the Southern Gas Basin of the North Sea.

Block 49/8c contains the Monterey Gas discovery and the Stinson prospect.

www.blackrockoil.com


ENDS




                      This information is provided by RNS
            The company news service from the London Stock Exchange

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