Putumayo well gauges natural oil flows

Gran Tierra Energy Inc., Calgary, gauged natural oil flows on tests of the Cretaceous Lower and Middle Caballos formations at its Juanambu-1 exploration well on the Guayuyaco Block in the Putumayo basin of southern Colombia.

May 7th, 2007

By OGJ editors
HOUSTON, May 7 -- Gran Tierra Energy Inc., Calgary, gauged natural oil flows on tests of the Cretaceous Lower and Middle Caballos formations at its Juanambu-1 exploration well on the Guayuyaco Block in the Putumayo basin of southern Colombia.

Four more zones were to be tested, including shallower Cretaceous Villeta T sand, the well's primary objective.

The Caballos tests yielded stabilized flows of 32° gravity oil with constant wellhead flowing pressure. Further details were to be released on completion of the remaining tests. Most wells in the basin require pumping.

Working interests are Gran Tierra 50% and Solana Resources Ltd. 50%. State Ecopetrol has a 30% back-in right, which would reduce the companies' respective interests to 35% each.

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