He was speaking with representatives of the American Chamber of Commerce in Ukraine in Kyiv on Monday, an Ukrinform correspondent reports.
"But the potential for exploration and production in Ukraine - this is quite a statement from me, but Ukraine would be the Texas of Europe," Perry said.
He said that today the United States is the number-one oil and gas producing country in the world, but, according to geologists, gas reserves in Ukraine may be even higher than in the United States.
"I remind people that a decade ago, they told us that we had found all the fuel - the fossil fuels - in the world. They called it peak oil, remember? The guy traveled the country giving a speech about peak oil. And those resources were always there. But innovation and technology allowed us to be able to access them," Perry said, commenting on the U.S. taking a leading position in hydrocarbon production.