Canadian oil and gas firm Gran Tierra Energy said that following the completion of the drilling and testing of the Jilguero-1 exploration well on the Garibay Block in the Colombian Llanos Basin, has encountered oil in four formations, including the Une, Gacheta, Guadalupe and Mirador.
Gran Tierra Energy, through its wholly-owned subsidiary Solana Petroleum Exploration Colombia, has a 50% working interest under the Garibay exploration and production contract signed with Colombia’s National Hydrocarbon Agency.
CEPSA Colombia (CEPCOLSA), a wholly owned subsidiary of Compania Espanola de Petroleos, has completed initial testing on the Jilguero-1 well.
CEPCOLSA is the operator of the Garibay block and has the other 50% working interest.
The Une Formation’s oil bearing interval was perforated and tested from 9,477ft measured depth (MD) to 9,484 MD and was interpreted as having 19ft of total hydrocarbon pay sub-divided into 12ft of net oil pay in the Upper Une zone and 7ft of net oil pay in the Lower Une zone.
A variety of tests were performed resulting in up to 2,175 barrels of oil per day (bopd) of 39.9°API gravity oil with 11.5% water-cut through a 52/64 inch choke.
The Gacheta Formation was interpreted as having 15ft of total hydrocarbon pay and the interval was tested and perforated from 9,285ft to 9,300ft MD.
The test produced up to 669bopd of 36.9°API gravity oil with 11% water-cut through a 24/64 inch choke.
The Guadalupe Formation was interpreted as having 31ft of total hydrocarbon pay and the lower interval was tested and perforated from 8,991ft to 8,994ft MD with the test producing 35bopd of 11.8°API gravity oil with 4% water-cut.
The Mirador Formation was interpreted as having 46ft of total hydrocarbon pay and the interval was tested and perforated from 8,852ft to 8,898ft MD the test producing up to 1,015bopd of 24.7°API gravity oil with 0.11% water-cut.