Top U.S. natural gas producer EQT Corp said on Friday the Federal Trade Commission has asked for more information on its planned .2 billion buyout of THQ Appalachia I LLC and associated pipeline infrastructure. The deal, first announced in September, is one of the biggest in the oil and gas space to face scrutiny from a regulator that once rarely opposed deals in the sector. EQT also said it has begun discussions with THQ's pipeline operator XcL Midstream and the company to amend the terms of the deal in case it does not close by Dec. 30 as originally planned.