Gastar Exploration Announces Successful John Parker #3 Knowles Limestone Well

    HOUSTON, June 11 /CNW/ - Gastar Exploration Ltd. (AMEX:  GST) and (TSX:YGA)
is pleased to announce that it has drilled the John Parker #3 well, located in
Robertson County, Texas, to a total depth of 13,900 feet. The John Parker #3
is a vertical well intended to test and produce the Knowles Limestone
formation that was encountered in the John Parker #2 well. Based on
preliminary analysis of electric logs and natural gas shows encountered during
drilling, the well intersected approximately 34 net feet of apparent pay in
the targeted Knowles Limestone formation. The Knowles Limestone formation
encountered in the John Parker #3 well appears to have very similar properties
to the high porosity and permeability confirmed in the Knowles in the John
Parker #2 well through sidewall core analysis.

    Gastar is in the process of installing production casing to total depth
and plans to complete the well in the Knowles Limestone formation. The initial
completion activities are expected to take approximately 20 days and, if
successful, initial gas sales are expected shortly thereafter. Gastar has a
50% working interest, with Chesapeake Energy Corporation (NYSE:  CHK) and an
unrelated private exploration and production company each owning a 25% working

    J. Russell Porter, Gastar's President and Chief Executive Officer, made
the following comments on these well results, "Along with the continued
success of our Bossier drilling program, the potential to demonstrate
meaningful synergistic production and reserve potential from a shallower
formation adds to our potential asset and corporate valuations. Gastar is
finalizing plans for a horizontal Knowles Limestone well to be drilled in the
vicinity of the Company's previous Lone Oak Ranch and John Parker wells. If
successful, a horizontal Knowles well should provide more efficient drainage
and potentially higher production rates than a vertical well."

    Gastar Exploration Ltd. is an exploration and production company focused
on finding and developing natural gas assets in North America and Australia.
The Company pursues a strategy combining select higher risk, deep natural gas
exploration prospects with low-risk coal bed methane (CBM) development. The
Company owns and controls exploration and development acreage in the deep
Bossier gas play of East Texas. Gastar's CBM activities are conducted within
the Powder River Basin of Wyoming and upon the approximate 3.0 million acres
controlled by Gastar and its joint development partners in Australia's
Gunnedah Basin (PEL 238) located in New South Wales and the Gippsland Basin
located in Victoria.

    Safe Harbor Statement and Disclaimer:

    This press release includes "forward looking statements" within the
meaning of Section 27A of the Securities Act of 1933 and Section 21E of the
Securities Act of 1934. A statement identified by the words "expects",
"projects", "plans", and certain of the other foregoing statements may be
deemed forward-looking statements. Although Gastar believes that the
expectations reflected in such forward-looking statements are reasonable,
these statements involve risks and uncertainties that may cause actual future
activities and results to be materially different from those suggested or
described in this press release. These include risks inherent in the drilling
of natural gas and oil wells, including risks of fire, explosion, blowouts,
pipe failure, casing collapse, unusual or unexpected formation pressures,
environmental hazards, and other operating and production risks inherent in
the natural gas and oil drilling and production activities, which may
temporarily or permanently reduce production or cause initial production or
test results to not be indicative of future well performance or delay the
timing of sales or completion of drilling operations, risks with respect to
natural gas and oil prices, a material decline in which could cause the
Company to delay or suspend planned drilling operations or reduce production
levels, and risks relating to the availability of capital to fund drilling
operations that can be adversely affected by adverse drilling results,
production declines and declines in natural gas and oil prices and other risk
factors described in the Company's Annual Report on Form 10-K, as filed on
March 27, 2007 with the SEC at and on the System for Electronic
Document Analysis and Retrieval (SEDAR) at

    The American Stock Exchange and the Toronto Stock Exchange have not
reviewed and do not accept responsibility for the adequacy or accuracy of this

    Contact Information:

For further information:

For further information: Gastar Exploration Ltd. J. Russell Porter,
713-739-1800 or Michael A. Gerlich, 713-739-1800 Fax: 713-739-0458

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