 CALGARY, Alberta, Oct. 13, 2021 GLOBE NEWSWIRE -- Gran Tierra Energy Inc. Gran Tierra or the Company NYSE American:GTETSX:GTELSE:GTE today announced an operations and financial update. All dollar amounts are in United States dollars and all production volumes are on a working interest before royalties WI basis and are expressed in barrels bbl of oil per day BOPD, unless otherwise stated. 