The Topoyaco-2 well was drilled to explore Prospect C, with prospective resources certified by Petrotech Engineering in its April report of 19.26mmbbl (best estimate).
At Topoyaco-2 in Prospect C, Alange Energy was originally targeting the Villeta and Caballos formations, the main oil reservoirs along the structural-stratigraphic play of the foothills.
However, in the course of drilling, the well logs showed the presence of significant net oil sands from what is now believed to be Lower Rumiyaco formation (informally named Neme).
Although the presence of heavy oil indicates that it is Rumiyaco, the definitive stratigraphic model will have to be validated by a thorough geological evaluation to encompass correlations with the neighboring blocks to the south and northeast.
Alange Energy carried out the testing of 310 barrels per day in an oil saturated section at a depth from 7,532ft to 7,624ft, which had identified a net pay of 48ft.
The significant net oil sand thickness, indicative of a significant deposit, merits an appraisal well for a first assessment of the lateral continuity of the reservoir.
Topoyaco-2 has proved the existence of oil accumulations in Prospect C’s play type, confirming the structural model.
In the meantime, the exploration program for Villeta and Caballos formations will continue with the drilling of a new well in Prospect C.
Additionally, as originally planned, the most important objective of the Topoyaco block is Prospect D, which Alange Energy will start drilling late in the first quarter of 2011 which, in contrast to the other prospects, will target the sub-thrust.
