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Tsimiroro is located in Madagascar
Location of Tsimiroro
Country Madagascar
Coordinates 18°21′8″S 45°0′17″E / 18.35222°S 45.00472°E / -18.35222; 45.00472Coordinates: 18°21′8″S 45°0′17″E / 18.35222°S 45.00472°E / -18.35222; 45.00472
Operators Madagascar Oil
Estimated oil in place 9.3 million barrels (~1.3×10^6 t)

Tsimiroro is the name of a large oil field in the onshore Morondava Basin of Madagascar found south of the Bemolanga ultra heavy oil field and south of the town of Morafenobe. It is estimated to contain as many as 9.3 billion barrels (1.48×109 m3) of heavy oil. The oil is found in the Isalo and Amboloando formations.

Madagascar Oil, founded by Sam Malin, is current license holder of the Tsimiroro field. It describes the field as being a heavy oil field with a significant volume of oil in place. It gives figures for oil in place (2010 estimates) as:

Oil in Place Volumes billion barrels Low Medium High
Contingent Resources 1.100 1.688 2.459
Prospective Resources 0.991 2.189 6.872
Total 2.091 3.877 9.331

The oil is 14-16ºAPI with low sulphur (<0.4%), low vanadium but some iron. The field, 100 km (60 mi) from the coast is at 100–300 m (300–1000 ft) depth. Prior to Madagascar Oil's involvement, 61 wells had been drilled on Tsimiroro’s c. 70 km² (30 sq mi) core area.

Work undertaken by Madagascar Oil, which is ongoing, includes to date: detailed geologic analysis clarifying the main Tsimiroro Field area, the drilling of 45 wells (with an 80% rate of success), a 430 km (267 mi) Electrical Resistivity Tomography program and the building of an in-field production test facility that subjected three Amboloando wells to cyclic steam injection. Oil columns ranging from 8 to 60 metres (26 to 197 ft) were reported with discoveries at eight out of ten exploration wells. The wells exhibited a classic steam stimulation production rate and decline that greatly exceeded expectations (highest rate achieved was 200 barrels (32 m3) per day leading Madagascar Oil to conclude that the field can be successfully developed using conventional vertical pattern steam flood. Minimal historic cold flow notwithstanding, the test facility led to the first oil production ever in Madagascar in March 2008.

Building on the earlier results, Madagascar Oil is commencing a nine pattern steam flood pilot project in late 2011 which is expected to raise the oil recovery factor to 60 percent.

Tsimiroro is believed to be able to achieve at least 80,000 barrels (13,000 m3) to 100,000 barrels (16,000 m3) of oil output per day over 35–40 years.


  1. ^ Data in this table are as per Netherland Sewell


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