Center of gravity in oil world shifts to Americas

LOMA LA LATA, Argentina — In a desertlike stretch of scrub grass and red buttes, oil companies are punching holes in the ground in search of what might be one of the biggest recent discoveries in the Americas: enough gas and oil to make a country known for beef and the tango an important energy player.

The environment is challenging, with resources trapped deep in shale rock. But technological breakthroughs coupled with a feverish quest for the next major find are unlocking the door to oil and natural gas riches here and in several other countries in the Americas not traditionally known as energy producers.