Exhibit 99.1

News release via Canada NewsWire, Calgary 403-269-7605

	    Attention Business Editors:
	    Advantage Announces 12 MMCFD Montney Horizontal Well On-Production, Well
	    Tests Exceeding Expectations across the Glacier Land Block and Plans to
	    Drill a Nikanassin Horizontal Well

	    (TSX: AAV, NYSE: AAV)

	    CALGARY, Dec. 7 /CNW/ - Advantage Oil & Gas Ltd. ("Advantage" or the
"Corporation") is pleased to provide an operational update regarding its
Montney horizontal well drilling at Glacier, Alberta and highlights of its
proposed development program for the first quarter of 2010.

	    <<
	    Montney Horizontal Well On-Production at 12 MMCFD

	    -   A new Glacier Montney well was brought on-stream at a sustained
	        production rate of 12 mmcfd at a flowing pressure of 1,300 psig. The
	        well (100% Advantage working interest) was drilled horizontally into
	        the Upper Montney zone and completed with 12 fracs along the
	        horizontal section.

	    -   This horizontal well was recently production tested at over 8.9 mmcfd
	        and the actual production rate has exceeded expectations as the well
	        cleaned-up upon initial production.

	    -   Existing facilities and gathering systems at Glacier are currently at
	        capacity. Facilities and gathering system expansions which include a
	        new 50 mmcfd gas plant (Advantage 100% working interest) are under
	        construction and targeted for completion during the second quarter of
	        2010.

	    Montney Well Tests Exceeding Expectations across our Glacier Land Block

	    -   The last six horizontal wells drilled at Glacier were production
	        tested at an average rate of over 6.5 mmcfd per well at an average
	        flowing pressure of 900 psi. This represents a 63% improvement on the
	        average test rates observed in our initial 8 Upper Montney wells and
	        ranks within the top quartile of well test results within the Montney
	        trend. This improvement is attributed to i) improved geological
	        understanding of the Montney as we delineate our land block and
	        ii) enhanced completion techniques. Cost efficiencies have greatly
	        increased with an average reduction of 43% in drilling costs per
	        meter and a 57% reduction in completion costs per frac.

	    -   Two of our last six Upper Montney horizontal wells (100% Advantage
	        working interest) were drilled on the eastern portion of our land
	        block and flowed at an average rate of 8.1 mmcfd at an average
	        flowing pressure of 812 psi. These wells prove up a significant area
	        of un-drilled acreage within our Glacier property and are located
	        approximately eight miles from some of our recently tested wells.

	    -   Four horizontal wells have been drilled targeting the Lower Montney
	        zone since July 2009. One of these wells (Advantage 100% working
	        interest) is adjacent to some of the highest rate wells along the
	        Lower Montney trend. The other three wells (1.1 net wells) were
	        drilled on joint interest lands. Completion and test results on these
	        four Lower Montney wells are expected in early 2010.

	    Nikanassin Resource Potential to be Tested at Glacier

	    -   Advantage has recently licensed a Nikanassin horizontal well at
	        Glacier which will be drilled in 2010. We are excited about the
	        future resource potential in the Nikanassin which has yet to be
	        evaluated with horizontal well and multi-frac technology at Glacier.

	    -   Advantage has a 93% average working interest ownership in 71 gross
	        (66 net) sections of land in the Nikanassin formation at our Glacier
	        land block.

	    -   The Nikanassin formation is located above the Montney formation and
	        has been identified over the entire Glacier land block through
	        geological mapping with gross formation thicknesses of up to
	        50 meters present within the target interval.

	    -   Productivity in the Nikanassin has been demonstrated by several
	        vertical wells at Glacier which have been on production since 2003.
	        One of our 100% working interest vertical Nikanassin wells
	        demonstrated an initial production rate of 1.4 mmcfd and has produced
	        a total of 0.5 Bcf since 2004. The well continues to produce and
	        compares favorably to some of the better vertical Montney wells on
	        our acreage. Horizontal well and multi-frac technology is anticipated
	        to significantly improve the initial production rate and the
	        recoverable reserves per well.

	    -   Development economics for the Nikanassin will be highly efficient in
	        regard to facilities costs as the extensive facility infrastructure
	        that is currently being developed for the Montney can be utilized to
	        accommodate future production from both formations as required.

	    Glacier Phase II Development Program On-Track to 50 MMCFD

	    -   Operational activities which include drilling, completions and
	        facilities expansions are on-schedule to achieve a production target
	        of 50 mmcfd from our Glacier property by the second quarter of 2010.

	    -   To date, 8 of the 22 horizontal wells that have been drilled since
	        July 2009 have been completed and tested. Combined production tests
	        for these 8 wells amount to over 44 mmcfd.

	    -   Regulatory approvals for Advantage's new 50 mmcfd gas plant (100%
	        working interest) and associated gas gathering pipeline expansions at
	        Glacier have been received and construction has commenced. Our
	        50 mmcfd gas plant will eliminate third party processing fees and is
	        anticipated to reduce operating costs at Glacier by 67% from
	        $8.25/boe to $2.75/boe.

	    Guidance and Hedging

	    -   Given the high level of operational activity, corporate guidance for
	        2010 will be provided early in the New Year.

	    -   Advantage's strong hedging program which includes 58% of our natural
	        gas production for 2010 at an average price of $7.46 Cdn AECO per mcf
	        significantly enhances our ability to leverage capital spending
	        during this low supply cost environment and to capitalize on the
	        Alberta Royalty Incentive Programs.
	    >>

	    Advisory

	    The information in this press release contains certain forward-looking
statements, including within the meaning of the United States Private
Securities Litigation Reform Act of 1995. These statements relate to future
events or our future intentions or performance. All statements other than
statements of historical fact may be forward-looking statements.
Forward-looking statements are often, but not always, identified by the use of
words such as "seek", "anticipate", "plan", "continue", "estimate",
"demonstrate", "expect", "may", "will", "project", "predict", "potential",
"targeting", "intend", "could", "might", "should", "believe", "would" and
similar expressions and include statements in the press release relating to,
among other things, resource estimates, timing of drilling, completion and
testing of certain wells, expected results of the use of horizontal well and
multi-frac technology, expected economics of development with respect to the
Nikanassin formation, expected production and operating costs with respect to
our Glacier Phase II Development Program and guidance and hedging. These
statements involve substantial known and unknown risks and uncertainties,
certain of which are beyond Advantage's control, including: the impact of
general economic conditions; industry conditions; changes in laws and
regulations including the adoption of new environmental laws and regulations
and changes in how they are interpreted and enforced; fluctuations in
commodity prices and foreign exchange and interest rates; stock market
volatility and market valuations; volatility in market prices for oil and
natural gas; liabilities inherent in oil and natural gas operations;
uncertainties associated with estimating oil and natural gas reserves and
resources; competition for, among other things, capital, acquisitions, of
reserves, undeveloped lands and skilled personnel; incorrect assessments of
the value of acquisitions; changes in income tax laws or changes in tax laws
and incentive programs relating to the oil and gas industry and income trusts;
geological, technical, drilling and processing problems and other difficulties
in producing petroleum reserves; and obtaining required approvals of
regulatory authorities. Advantage's actual decisions, activities, results,
performance or achievement could differ materially from those expressed in, or
implied by, such forward-looking statements and, accordingly, no assurances
can be given that any of the events anticipated by the forward-looking
statements will transpire or occur or, if any of them do, what benefits that
Advantage will derive from them. Except as required by law, Advantage
undertakes no obligation to publicly update or revise any forward-looking
statements. For additional risk factors in respect of Advantage and its
business, please refer to Advantage Energy Income Fund's (as predecessor to
Advantage) Annual Information Form dated March 18, 2009 which is available on
SEDAR at www.sedar.com.
	    References in this press release to test production rates, initial
productivity, initial flow rates and average flowing pressure are useful in
confirming the presence of hydrocarbons, however such rates are not
determinative of the rates at which such wells will commence production and
decline thereafter. While encouraging, readers are cautioned not to place
reliance on such rates in calculating the aggregate production for the
Advantage.

	    Barrels of oil equivalent (boe) may be misleading, particularly if used
in isolation. A boe conversion ratio has been calculated using a conversion
rate of six thousand cubic feet of natural gas to one barrel. Such conversion
rate is based on an energy equivalency conversion method application at the
burner tip and does not represent an economic value equivalency at the
wellhead.
	    This press release contains references to estimates of natural gas
classified as total petroleum initially in place which are not, and should not
be confused with, estimates of oil and gas reserves. "Total petroleum
initially in place" is defined in the Canadian Oil and Gas Evaluation Handbook
(the "COGE Handbook") as the quantity of petroleum that is estimated to exist
originally in naturally occurring accumulations. Total petroleum initially in
place includes that quantity of petroleum that is estimated, as of a given
date, to be contained in known accumulations, prior to production, plus those
estimated quantities in accumulations yet to be discovered. Both the
discovered and undiscovered portion of the total petroleum initially in place
can be divided into recoverable and unrecoverable portions, with the estimated
future recoverable portion from known accumulations classified under the COGE
Handbook as reserves and contingent resources and the recoverable portion from
undiscovered accumulations classified under the COGE Handbook as prospective
resources. The estimates of total petroleum initially in place contained in
this press release have been internally estimated by Advantage and have not
been evaluated or audited by an independent engineering firm. Due to the stage
of evaluation of the estimates of total petroleum initially in place, it
cannot be determined whether the volumes represent contingent resources,
prospective resources, reserves or unrecoverable resources. There is no
certainty that any portion of the total petroleum initially in place will be
discovered. If discovered, there is no certainty that the total petroleum
initially in place will be developed and whether it will be commercially
viable to produce any portion of the total petroleum initially in place.

	    %CIK: 0001468079

	    /For further information: Investor Relations, Toll free: 1-866-393-0393,
ADVANTAGE OIL & GAS LTD., 700, 400 - 3rd Avenue SW, Calgary, Alberta, T2P 4H2,
Phone: (403) 718-8000, Fax: (403) 718-8300, Web Site: www.advantageog.com,
E-mail: ir(at)advantageog.com/
	    (AAV.DB.C. AAV.DB.E. AAV.DB.D. AAV.DB.G. AAV. AAV)

CO:  Advantage Oil & Gas Ltd.

CNW 21:20e 07-DEC-09