2011-05-18

Uzbekistan Business Development

TASHKENT, UZBEKISTAN, May 18, 2011 (MARKETWIRE via COMTEX) --

Tethys Petroleum Limited ("Tethys" or the "Company" (TSX: TPL)) today provided information on progress at the 15th Uzbekistan International Oil and Gas Conference ("OGU") in Tashkent and in parallel with this signed a contract with the Institute of Geology and Prospecting for Oil and Gas Deposits (the "Institute") of NHC Uzbekneftegaz ("UNG"), the State oil and gas company, to review materials on exploration areas in the Ustyurt region and the Bukhara-Khiva region.

Dr. David Robson, Chief Executive Officer of Tethys, today gave a presentation on the "Doris oil discovery (in Kazakhstan) and the potential of the Ustyurt basin". The Ustyurt basin covers large areas both in Kazakhstan and Uzbekistan. To date there has not been a commercial oil discovery in the Uzbek portion of the basin though the geology is similar to the area where Tethys has made a commercial oil discovery (Doris) in the Kazakh portion, some 35 km from the border of the two countries. Tethys believes that, by applying the same geological model and techniques used in the discovery of Doris to the Uzbekistan portion of the basin, there is very good potential for finding oil there too.

In conjunction with OGU, Tethys announced it has signed a contract with the Institute to study the potential of two separate prospective areas in Uzbekistan with a view to Tethys applying for suitable projects in these areas. The study will involve the assessment of existing data and the oil and gas bearing prospectivity of the areas on the basis to prepare proposals for the Government of Uzbekistan for further exploration activities. Tethys views both areas as having very good oil and gas potential.

This press release contains "forward-looking information" which may include, but is not limited to, statements with respect to our operations. Such forward-looking statements reflect our current views with respect to future events and are subject to certain risks, uncertainties and assumptions. See our Annual Information Form for the year ended December 31, 2010 for a description of risks and uncertainties relevant to our business, including our exploration and development activities.

Contacts: Tethys Petroleum Limited Sabin Rossi Vice President Investor Relations +1 416 572 2065 +1 416 572 2201 (FAX) info@tethyspetroleum.com Tethys Petroleum Limited TD Canada Trust Tower 161 Bay Street, 27th Floor Toronto M5J 2S1, Canada Mobile site: http://m.tethyspetroleum.com www.tethyspetroleum.com In Asia-Pacific Quam IR Anita Wan, Associate Director + (852) 2217-2999 + (852) 2217-2999 (FAX) anita.wan@quamgroup.com
SOURCE: Tethys Petroleum Limited

mailto:info@tethyspetroleum.com http://m.tethyspetroleum.com http://www.tethyspetroleum.com mailto:anita.wan@quamgroup.com