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Message: NR more oil 1b to 3bb Shwrkh Ad1 and 4.9 to 10.8bb Shaikan

Gulf Keystone Petroleum Ltd. (AIM: GKP)

("Gulf Keystone" or "the Company")

Sheikh Adi Preliminary Resource Evaluation

Gulf Keystone announces today results of an independent preliminary evaluation of the Sheikh Adi resources by Dynamic Global Advisors (DGA), independent Houston-based exploration consultants.

The DGA report, based on Sheikh Adi-1 wireline logging data, core samples, 2D and 3D seismic and regional data, has indicated a significant range of between 1 billion barrels and 3 billion barrels of gross oil-in-place volumes calculated on the P90 to P10 basis, with a P50 estimate of 1.9 billion barrels.

Gulf Keystone has completed drilling of Sheikh Adi-1, the first exploration well to be drilled on the Sheikh Adi structure, to a TD (total depth) of 3,780 meters in the Triassic zone. A series of flow tests will now be performed on a number of Jurassic zones in the Sheikh Adi-1 well. Testing in the Triassic zone will not be possible due to issues relating to casing integrity at these depths.

The Sheikh Adi block is located immediately to the west of the Company's Shaikan block, where a major discovery was made in 2009. Gulf Keystone is the Operator of the Sheikh Adi block with an 80 percent working interest and is carrying the Kurdistan Regional Government's 20 percent working interest in the block.

DGA's previous assessments of assets on behalf of Gulf Keystone included independent evaluation of the Shaikan discovery, including a major revision of the gross oil-in-place volumes (4.9 billion barrels to 10.8 billion barrels calculated on the P90 to P10 basis) announced in April 2011.

John Gerstenlauer, Gulf Keystone's Chief Operating Officer commented:

"This independent report demonstrates the potential of the Sheikh Adi block with between 1 and 3 billion barrels of gross oil-in-place. This report reinforces our belief in having encountered yet another potential world class oil source. We plan to further evaluate the Sheikh Adi structure and define and assess this complicated geological structure. The Sheikh Adi oil-in-place numbers are all the more significant due to our 80 percent interest in the block. These numbers are in addition to 7.5 billion barrels of P50 oil-in-place at Shaikan, 2.4 billion barrels of P50 oil-in-place at Akri-Bijeel and 1.9 billion barrels of estimated petroleum-initially-in-place at Ber Bahr. This report further demonstrates the world class nature of Gulf Keystone's assets in the Kurdistan Region of Iraq".

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