China
Africa
Explore chapters and articles related to this topic
Offshore Drilling
Published in Sukumar Laik, Offshore Petroleum Drilling and Production, 2018
In the course of geological depositions, a substantial amount of sediments remain under the salt deposits, that is, autochthonous salt layer which contains a huge reserve of oil and gas. These are known as pre-salt layers. It is the geological layers that were laid down before a salt layer accumulated above them and the petroleum that was formed in the pre-salt layer could not move upward because the salt layer acted as an impervious rock. As a result, a large accumulation of oil and gas took place. Though the actual reserve is not known, the local report available from Petrobras and other companies indicates that the oil and natural gas lie below an approximately 2000 m deep layer of salt, itself being an approximately 2000 m deep layer of rock under 2000–3000 m of the Atlantic containing 50 billion barrels of oil which is four times greater than the current reserve in the Brazilian continental shelf. But the drilling through the salt to extract the pre-salt oil and gas is very expensive.
The effect of productivity and country risk on development in the Brazilian Pre-salt Province
Published in Energy Sources, Part B: Economics, Planning, and Policy, 2019
Larissa Nogueira Hallack, Robert K. Kaufmann, Alexandre Szklo
We compile a time series for well completions in the pre-salt layer using observations from Santos and Campos Basin. To separate offshore development wells between the pre-salt and post-salt layer, we consider the geological group/formation and the pre-salt fields. According to ANP (2018d), wells in the geological group/formation Guaratiba and Lagoa Feia, respectively, in Santos Basin and Campos Basin are from the pre-salt layer. We also consider the pre-salt fields that possess development wells: Lula, Sapinhoá, Búzios, Lapa, Sururu, Mero, Sépia, Sul de Lula, Itapu, Atapu, Sul de Berbigão and Berbigão (ANP, 2018c, 2018d; Braga and David 2018; Petrobras 2014).