Vantage Energy, LLC Receives $470 Million Equity Commitment

Denver – Vantage Energy, LLC, a private oil and gas company headquartered in Denver, today announced equity commitments of $470 million from an investment group consisting of Quantum Energy Partners, Carlyle/Riverstone and Lime Rock Partners. Vantage will focus on the acquisition, development and exploration of unconventional natural gas resources, primarily tight gas sands, gas shales and coalbed methane, onshore in North America. Vantage will acquire and develop properties with significant undeveloped potential and apply technical and business expertise to maximize the value of those resources.

Vantage was formed in October 2006 by Roger Biemans and Tom Tyree. The founders and employees of Vantage are making significant equity commitments to the Company alongside the investor group. Roger J. Biemans will serve as Chairman and Chief Executive Officer of Vantage. Previously, Mr. Biemans served as President of EnCana Oil & Gas USA, Inc. where he managed EnCana’s U.S. property portfolio and focused on unconventional resource plays throughout the U.S. Thomas B. Tyree, Jr., will serve as President and Chief Financial Officer of Vantage. Mr. Tyree formerly served as Chief Financial Officer of Bill Barrett Corporation, an independent exploration and production company focused on unconventional resources in the Rocky Mountains.

About Vantage Energy, LLC

Vantage Energy, LLC is a Denver-based oil and natural gas exploration and development company. Vantage is focused on the acquisition, development and exploration of unconventional resources, primarily tight gas sands, gas shales and coalbed methane, onshore in North America. Vantage seeks to acquire and develop properties with significant undeveloped potential and apply technical and business expertise to maximize the value of those resources.

About Quantum Energy Partners

Founded in 1998, Quantum is an investment firm specializing in the energy industry with over $3.2 billion in capital under management, of which $2.0 billion is in its family of private equity funds, and $1.2 billion is in its direct property acquisition fund, Quantum Resources. Quantum primarily targets investments in the oil & gas sector, while also considering opportunities in the midstream, oil field service, coal, power, and alternative energy sectors. To learn more about partnering with Quantum Energy Partners, please contact either S. Wil VanLoh, Jr. or Alan L. Smith at (713) 225-4800 or visit Quantum’s website at www.quantumep.com/ . For investor relations, please contact Michael P. Dalton.

About Lime Rock Partners

Established in 1998, Lime Rock manages $2.1 billion of private capital for investment in the energy industry through Lime Rock Partners, investors of growth capital in energy companies worldwide, and Lime Rock Resources, acquirers and operators of oil and gas properties in the United States. With $1.6 billion under management, Lime Rock Partners is a creative, value-adding, and long-term investor of growth capital in companies in the global exploration and production, energy service, and oil service technology sectors. For more information, please visit www.lrpartners.com/ .