Colombia gets oil, gas find on Putumayo block

By OGJ editors
HOUSTON, June 28
-- Gran Tierra Energy Inc., Calgary, will appraise the Moqueta-1 two-zone oil and gas discovery on the operated Chaza block in Colombia’s Putumayo basin.

Gran Tierra will drill an appraisal well from the same pad and shoot 3D seismic on the block. Early production is to start in the first quarter of 2011.

Natural flow rates at the discovery well were as much as 349 b/d of 29° gravity oil on a 32/64-in. choke with 0.2% water cut from Caballos at 3,950-70 ft. The zone had 26 ft of net oil pay. The well also has a shallower Caballos zone with 27 ft of net gas pay.

The well also flowed 13 MMscfd of gas on a 48/64-in choke from Villeta T sandstone perforated at 3,734-46 ft measured depth. The Villeta zone has 55 ft of net gas pay.

Gran Tierra plans to lay an 8-km pipeline to tie Moqueta-1 into the Costayaco infrastructure, with anticipated initiation of long term oil testing and early production in the first quarter of 2011.

Bottomhole location of Moqueta-2 will be 270 m east of Moqueta-1. The objective is to delineate the volume of the lower Caballos oil pool by targeting the reservoir 60 ft deeper down the flank of the structure. Moqueta-2 will also test the potential for a gas-oil contact in the Villeta U, Villeta T, and upper Caballos zones downstructure.

Pending results from Moqueta-2, Moqueta-3 would be drilled from a new pad 1.5 km southwest of the Moqueta-1 surface location.

Gran Tierra will shoot 230 sq km of 3D seismic over the Moqueta discovery and adjacent prospects and leads. This survey will overlap existing 3D surveys that cover Costayaco field; Juanambu, Toroyaco, Linda, Mary, and Miraflor fields in the adjacent Gran Tierra-operated Santana and Guayuyaco blocks; as well as the upcoming Verdeyaco 3D survey on the Chaza and Guayuyaco blocks.

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