UPDATE 1-Major AEP investor settles Chesapeake trade secrets lawsuit

April 14 (Reuters) - Energy & Minerals Group (EMG), which has invested billions in oil and gas ventures with former Chesapeake Energy Corp Chief Executive Officer Aubrey McClendon, has moved to extricate itself from a lawsuit filed by Chesapeake alleging McClendon stole its trade secrets and used them to build up his new businesses.