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Da Silva, Hercules Tadeu1, Robert. A. Bonora Vieira1, Fernando T. Fontes1
(1) Petroleo Brasileiro S/A - Petrobras, Vitoria -ES, Brazil

ABSTRACT: Producing Heavy Oil in Deep-Waters> The Success Case of the Jubarte Oil Field, Campos Basin, Southeastern Brazil

The ESS-100 wildcat (ESS-100 well), drilled in 2000, discovered the deep-water Jubarte oil field (Jubarte). The ESS-100 well is located in the northern Campos Basin and encountered Maastrichtian sandstones saturated with 17 API gravity oil. A drill-stem test was performed in cased hole obtaining a daily rate at 580 barrels/day. Reserve estimates, based on 2D seismic, were around 150 MM boe. The positive results obtained, encouraged Petrobras to acquire a spec 3D seismic over the discovery area. A concentrated work on the ESS-100 well produced a twofold benefit: 1) reserves estimates were higher than expected and 2) other exploratory leads were identified. Some of these leads became new discoveries in the area now called Whale Park. One of these discoveries was named Cachalote. Altogether, Jubarte and Cachalote fields have a total oil reserve of 950 MM boe. Important lessons obtained at Jubarte include: 1) the value of availability of 3D seismic to better understand depositional/trapping mechanisms, 2) reservoir modeling made possible by production data retrieved from the cased DST performed at the ESS-100 well and 3) well coordinated work done by a multidisciplinary task force enabled Petrobras to transform a deep-water, viscous oil accumulation into an economically viable oil field. Jubarte represents a true example of Petrobras’ pioneering spirit and its commitment to be on the leading edge of production technology in deep-water. Exploration and production data garnered at Jubarte will be of utmost importance in other low-gravity, viscous oil discoveries found in southeastern Brazil.


AAPG Search and Discovery Article #90026©2004 AAPG Annual Meeting, Dallas, Texas, April 18-21, 2004.