Colombia Middle Mag find may have two pays

An apparent discovery in Colombia’s Middle Magdalena basin may have oil pay zones in the Upper Cretaceous Umir and Paleocene Lisama formations, said PetroLatina Energy PLC.

By OGJ editors
HOUSTON, Feb. 10
-- An apparent discovery in Colombia’s Middle Magdalena basin may have oil pay zones in the Upper Cretaceous Umir and Paleocene Lisama formations, said PetroLatina Energy PLC.

The Zoe-1 well, on the Midas block 12 km east of Santa Lucia heavy oil field, went to a total depth of 10,924 ft. Logs show the well to be 60 ft true vertical depth subsea structurally higher at the Lisama level to the San Alberto well Texaco drilled on the same structure in 1985.

Log analysis at Zoe-1 indicated 47 ft of net oil pay in Lisama at 8,632-8,701 ft. A section at 8,701-30 ft also has reservoir quality rock and good oil shows, but it is not yet clear whether it is oil-bearing.

The Zoe-1 well also appears to contain producible oil in Umir, where it found two thin sands. The Umir sands were found somewhat overpressured with porosities up to 27% and permeability of 100 md.

Umir tested at a stable 42 b/d of 23° gravity oil at 1,500 psi flowing tubinghead pressure on an 8/64-in. choke. Water cut is 5% and dropping. Umir tests will continue until the end of February, when a service rig will move in to test the Lisama.

PetroLatina is operator of the Midas block with 70% interest. The rig has moved to drill the Santa Lucia-4 development well between two existing wells that produce 19° gravity oil from Eocene La Paz.

Santa Lucia field has several undrilled development locations and potential extension locations and a nearby undrilled prospect. PetroLatina will drill at least one development well and one exploration well on this block in the current drilling campaign.

PetroLatina operates Santa Lucia field with 20% interest. Petrosantander Inc., Hosuton, has 20%, and Colombia’s state Ecopetrol SA has 60%.

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