Buyout firm KKR & Co. may purchase about $400 million of Texas shale assets from Hilcorp Energy, according to reports. New York-based KKR may partner with Hilcorp, an exploration and production company based in Houston, to develop the formation known as Eagle Ford in southern Texas, which has unconventional gas deposits. Unconventional gas is fuel trapped in shale formations, coal beds and impermeable sandstone rock. Eagle Ford is about 50 miles wide and 400 miles long, extending from TexasÔÇÖs southern border to the eastern part of the state.