Carbon dioxide volume estimated from seismic data after six years of injection in the oil field of Buracica, Bahia
Carbon dioxide has been injected since 1991 in the oil field of Buracica in the Recôncavo Basin in Brazil for EOR purposes. The CO2 gas is injected into the upper oil reservoirs, a 13 m-thick sandstone layer, at a depth of about 550 m. The reservoir is included in a tilted block dipping at an angle...
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Published in | Energy procedia Vol. 4; pp. 3314 - 3321 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
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Elsevier Ltd
2011
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Abstract | Carbon dioxide has been injected since 1991 in the oil field of Buracica in the Recôncavo Basin in Brazil for EOR purposes. The CO2 gas is injected into the upper oil reservoirs, a 13 m-thick sandstone layer, at a depth of about 550 m. The reservoir is included in a tilted block dipping at an angle of 5 to 6° toward the south-east.
A 3D seismic survey was carried out six years after the beginning of CO2 injection. Sensitivity studies concluded that the gas-invaded and the oil-filled parts of the reservoir show only a weak contrast between their mechanical properties so that their interface might not appear in the seismic sections.
Directional dip filtering of the seismic data underlines horizontal events crossing the dipping layer interfaces. Some of them can be interpreted as the gas/oil contact. A careful picking and mapping of these events reveal two accumulations of carbon dioxide on each side of a system of N-S faults, with slightly different gas/oil contact levels. Estimation of the gas volume and of the density leads to a rough estimate of the mass of CO2 in place, indicating that about one third of the CO2 injected was stored in the reservoir. |
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AbstractList | Carbon dioxide has been injected since 1991 in the oil field of Buracica in the Recôncavo Basin in Brazil for EOR purposes. The CO2 gas is injected into the upper oil reservoirs, a 13 m-thick sandstone layer, at a depth of about 550 m. The reservoir is included in a tilted block dipping at an angle of 5 to 6° toward the south-east.
A 3D seismic survey was carried out six years after the beginning of CO2 injection. Sensitivity studies concluded that the gas-invaded and the oil-filled parts of the reservoir show only a weak contrast between their mechanical properties so that their interface might not appear in the seismic sections.
Directional dip filtering of the seismic data underlines horizontal events crossing the dipping layer interfaces. Some of them can be interpreted as the gas/oil contact. A careful picking and mapping of these events reveal two accumulations of carbon dioxide on each side of a system of N-S faults, with slightly different gas/oil contact levels. Estimation of the gas volume and of the density leads to a rough estimate of the mass of CO2 in place, indicating that about one third of the CO2 injected was stored in the reservoir. |
Author | Ancel, Martine Schinelli, Marco Cesar Ricarte, Patrice Rocha, Paulo Sérgio Dino, Rodolfo Becquey, Marc |
Author_xml | – sequence: 1 givenname: Patrice surname: Ricarte fullname: Ricarte, Patrice organization: IFP Energies nouvelles, 1 et 4 avenue de Bois-Préau,92852, Rueil-Malmaison, France – sequence: 2 givenname: Martine surname: Ancel fullname: Ancel, Martine organization: IFP Energies nouvelles, 1 et 4 avenue de Bois-Préau,92852, Rueil-Malmaison, France – sequence: 3 givenname: Marc surname: Becquey fullname: Becquey, Marc organization: IFP Energies nouvelles, 1 et 4 avenue de Bois-Préau,92852, Rueil-Malmaison, France – sequence: 4 givenname: Rodolfo surname: Dino fullname: Dino, Rodolfo organization: CENPES, Av. Jequitibá, 950, Cidade Universitária, na Ilha do Fundão,CEP 21941-598, Rio de Janeiro, Brazil – sequence: 5 givenname: Paulo Sérgio surname: Rocha fullname: Rocha, Paulo Sérgio organization: Petrobras, Av. Antônio Carlos Magalhães, 1113-Itaigara CEP 41825-903 Salvador de Bahia, BA, Brazil – sequence: 6 givenname: Marco Cesar surname: Schinelli fullname: Schinelli, Marco Cesar organization: Petrobras, Av. Antônio Carlos Magalhães, 1113-Itaigara CEP 41825-903 Salvador de Bahia, BA, Brazil |
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References | U.R.A. Lino, 2005. Case history of breaking a paradigm: Improvement of an immiscible gas-injection project in Buracica Field by water injection at the gas/oil contact, SPE Latin American and Caribbean Petroleum Engineering Conference, Rio de Janeiro, Brazil, 94978-MS. Schinelli (br000015) 2002; 20 P.S. Rocha, R. Dino, Ch. Sanchez, P. Le Thiez, 2007. Assessing the CO Xu (br000020) 2006; 71 storage as a by-product of EOR activities in the Buracica Oil Field–Recôncavo Basin, NE Brazil, 6th annual conference on Carbon Capture & Sequestration, Pittsburgh, PA, USA. 10.1016/j.egypro.2011.02.252_br000005 Schinelli (10.1016/j.egypro.2011.02.252_br000015) 2002; 20 10.1016/j.egypro.2011.02.252_br000010 Xu (10.1016/j.egypro.2011.02.252_br000020) 2006; 71 |
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Snippet | Carbon dioxide has been injected since 1991 in the oil field of Buracica in the Recôncavo Basin in Brazil for EOR purposes. The CO2 gas is injected into the... |
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Title | Carbon dioxide volume estimated from seismic data after six years of injection in the oil field of Buracica, Bahia |
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