Private equity firms Apollo Global Management LLC
Kinder Morgan Inc
The banks advising Kinder Morgan on the sale -- Barclays Plc's
Sources said that strategic bidders as well as other private equity firms would be interested in the packages.
Kinder Morgan agreed to buy rival El Paso in October in a bid to combine the two largest natural gas pipeline operators in North America. But Kinder Morgan was not interested in owning El Paso's oil and gas exploration and production business and promptly put it on the block.
One source said Kinder Morgan would likely make a decision about how it planned to sell the business by the end of the month.
El Paso and Riverstone declined to comment, while an Apollo spokeswoman did not immediately respond to a request for a comment.
(Reporting By Greg Roumeliotis and Michael Erman; Editing by Maureen Bavdek and Gerald E. McCormick)