The Polish Geological Institute said 10% of tight gas from about 70 trillion cubic feet is recoverable. Exploring about 768 billion cubic meters of recoverable shale didn't increase production, Reuters said.
Chevron joins at least four other international energy producers who abandoned Poland because of disappointing results.
Reserve estimates were calculated by the company's independent reservoir engineering firm.
The well provides critical downhole data in an area where there was no previous deep drilling.
The Baraniec-1 and the Angowice-1 are in the Fences and Edge licenses.
The acquisition, for US$295 million, will increase the state-controlled company's output outside Poland by about 8,000 barrels of oil equivalent this year.
The wells are in the Fence and Edge licenses.
The U.S. Energy Information Administration cut Poland's technologically recoverable wet shale gas reserves by 21% from a 2011 forecast.
The company also reported that site preparation is nearly complete and the rig will begin moving on to the Angowice-1 well location next week.
The well is a planned test of a Rotliegend sandstone target at an estimated depth of 2,460 meters.