During the production phase of a reservoir, natural phenomenon, such as movement of fluids, changes in pressure and stress in and around reservoirs occur. In high-pressure reservoirs, pressure depletion during production is associated with compaction within the reservoir causing stretching or extensional stresses in the overburden and underlying formation. This causes variation in velocities and formation thickness, which can be observed as 4D time shifts between successive vintages. Tracking the movements of fluids due to production, for example, gives valuable information about the depletion of a field, and can indicate areas of bypassed oil or gas.
OTC Brasil 2013 – Petrobras Geology & Geophysics Expertise
During the OTC Brasil 2013 there were daily panel session, which covered some interesting themes. On Wednesday, October 30th, the panel session: Perspectives on E&P in the South Atlantic, had as one of its panelists Petrobras’ E&P Director, José Miranda Formigli Filho, known throughout Brazil simply as Formigli. According to Formigli, Petrobras’ knowledge of geology and geophysics (G&G) was vital for the national operator to meet the technological challenges and reach its exploratory success in deepwater pre-salt and post-salt E&P. Formigli estimated that by 2020 the pre-salt production will represent 50% of Petrobras’ output with the potential to reach some 31 billion barrels boe. By 2035, some 39 million barrels per day of new crude oil supply will be needed.