Publication of a joint U.S.-Poland report assessing the central European country's shale gas potential using U.S. Geological Survey methodology and Polish Geological Institute data has been delayed by at least one or two months, the Polish specialist leading the project told Dow Jones Newswires Tuesday.

The report was expected to have been ready in September.

"Writing the report will likely take another month or two," said Pawel Poprawa, head of the Petroleum Geology Laboratory at the Polish Geological Institute. "We have to complete one more working session with the U.S. Geological Survey."

Supportive government policies have prompted companies such as Exxon Mobil Corp. (XOM), Chevron Corp. (CVX), ConocoPhilips (COP), Talisman Energy Inc. (TLM), Marathon Oil Corp. (MRO), and Nexen Corp. (NYX), as well as Polish government-controlled PKN Orlen SA (PKN.WA) and PGNiG SA (PGN.WA), to buy licenses to explore for the resource in Poland.

"The report will contain estimates of shale gas reserves in Poland, conducted using USGS methodology, as well as a description of the methodology, assumptions and data used," Poprawa said. "The preparation of archival data, [which] isn't always compatible with western standards, is taking longer than we expected."

Poprawa added he didn't know when the report would be presented to the public.

Outside the U.S., Poland is one of the first countries where companies are making a serious effort to develop shale gas, which Polish Prime Minister Donald Tusk has called the country's "great chance," as it could loosen the central European country's dependence on Russia for its gas, create tens of thousands of jobs, and fill state coffers.

Current preliminary estimates put Poland's shale gas reserves at 5.3 trillion cubic meters, equal to more than 300 years of the country's annual gas consumption.

-By Marynia Kruk, Dow Jones Newswires; +48 22 447-2431; marynia.kruk@dowjones.com

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