State-owned Indian Oil Corporation (IOC), Adani-Total Gas Ltd and Shell were among the 29 companies that bid and bought natural gas to be produced from the deepest field in the KG-D6 block of Reliance Industries Ltd and bp, sources said. IOC walked away with almost half of the 6 million standard cubic meters per day of gas sold in an e-auction on Wednesday while state-owned gas utility GAIL bought 0.7 mmscmd, Adani-Total Gas Ltd 0.4 mmscmd, Shell 0.5 mmscmd, GSPC 0.25 mmscmd and IGS another 0.5 mmscmd, two sources with knowledge of the matter said.