Forbes: Why America's Shale Oil Boom Could End Sooner Than You Think

The U.S. has grown its oil production by a miraculous amount in recent years, but that growth rate is not going to keep up unless mountains of additional capital flow in to invest — capital that, like Statoil in the Bakken, has the patience to not generate meaningful returns for years.

This — unfortunately for those who have assembled acreage positions hoping to flip them for a big profit — is unlikely. Indeed, there is good reason to believe that the bubble in shale acreage has popped.
— Christopher Helman, Forbes