MADALENA CASES THE CAN X-4 WELL AS A POTENTIAL OIL DISCOVERY

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Madalena Ventures Inc. ( MVN ) and its wholly owned subsidiary Madalena Austral SA ("Madalena" or the "Corporation"), announces that the Corporation's CAN X-4 exploratory well on the Coiron Amargo Block has been cased as a potential oil discovery. The well is situated on a separately defined 3D drilling anomaly located between the CAN X-1 and CAN X-2 wells.

The CAN X-4 exploration well was drilled to total depth ("TD") of 11,027 feet and has been cased to TD.  Both oil and gas shows were evident during the drilling of the Vaca Muerta and Sierras Blancas formations.

AUSTIN, Texas  May 10, 2011 (Investorideas.com energy newswire) - SmallCapVoice.com, Inc. announced today that a new audio interview featuring, American Petro-Hunter, Inc. (OTC.BB:AAPH) is now available. The interview can be heard http://smallcapvoice.com/blog/5-6-11-audio-interview-with-american-petro-hunter-otcbb-aaph

Cashing in on Oklahoma's oil and gas boom, American Petro-Hunter Inc. (OTCBB:AAPH.ob - News) has acquired a varied working interest in seven lease blocks over 3,400 acres in Northern Oklahoma. Currently, the Company has drilled, completed and put into production 2 vertical wells with a 3rd well of commercial viability coming online shortly in the Woodford Shale and Mississippi Limestone.

Rosetta Resources Inc. Announces First Quarter Financial and Operating Results

Rosetta Resources Inc. (Nasdaq:ROSE ) ("Rosetta" or the "Company") today announced financial and operating results for the first quarter 2011, including an update on its operations in the Eagle Ford and Southern Alberta Basin shale plays. In addition, the Company completed the divestitures of non-core conventional producing properties, raising additional proceeds to fund its growth activities and strengthen its financial position.

"The first quarter of 2011 delivered strong results led by continued success in our Eagle Ford shale play. We have continued to shift our production base to a more balanced portfolio weighted towards liquids and are reaping the benefits of a lower operating cost structure." said Randy Limbacher, Rosetta's chairman, president and CEO. "We successfully completed our asset divestiture program and the proceeds will provide additional flexibility to execute our growth plans. Rosetta entered 2011 a streamlined and more focused company that is positioned to deliver double-digit growth into the future."

Ivanhoe Energy successfully upgrades heavy oil from its Pungarayacu field in Ecuador to pipeline quality

Tests demonstrate wide operating range of Ivanhoe Energy's HTL^TM (Heavy-to-Light) technology

David Dyck, President and Chief Operating Officer of Ivanhoe Energy Inc. (Toronto:IE) (NasdaqCM:IVAN) and Dr. Michael Silverman, Executive Vice President and Chief Technology Officer today announced that heavy crude oil extracted from Ivanhoe's IP-5B well in the Pungarayacu field in Block 20 in Ecuador has been successfully upgraded to local pipeline specifications using Ivanhoe Energy's proprietary HTL upgrading process. The successful tests demonstrate the flexibility and robustness of the HTL upgrading process to convert diverse heavy crude feedstocks into more valuable and marketable, pipeline-ready synthetic crude oil. In addition, these tests help position Ivanhoe Energy for full-scale heavy oil operations in Ecuador and in other countries having similar heavy oil characteristics.