Gastar Notes Sidetrack Operations at Donelson #4

Gastar Exploration announced today that the Donelson #4 well was drilled to a total depth of 19,000 feet; however, while addressing hole stability problems, the well experienced a significant gas kick and will have to be plugged back to approximately 18,100 feet and re-drilled to revised total depth of 18,700 feet. This second sidetrack operation is expected to take four to six weeks and require approximately $1.0 million in gross additional costs. The revised estimate of gross costs for the well is now $14 million to drill and complete. Gastar has a 67% before payout working interest and approximate 50% before payout net revenue interest in the Donelson #4.

J. Russell Porter, Gastar's President and CEO, commented, "We are encouraged since the Donelson #4 encountered several strong drilling breaks and gas shows in the targeted lower Bossier formations. We have obtained certain log information that confirms the presence of the B5 sand and the top of the B6 sand, which are the sands producing in the offset Belin #1 and Donelson #3 wells. While the additional costs and delays to re-drill a portion of the well will affect our first quarter 2010 production levels and capital expenditures, these deep Bossier wells provide the opportunity for excellent rates of return and prolific production levels."

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