4D Joint Stratigraphic Inversion of Prestack Seismic Data: Application to the CO2 Storage Reservoir (Utsira Sand Formation) at Sleipner Site

Monitoring of CO 2 Sequestration and Hydrocarbon Production Monitoring pour le stockage du CO 2 et la production des hydrocarbures Prediction under Uncertainty on a Mature Field Prévision de production sous incertitude pour un champ mature 207 > Advanced Integrated Workflows for Incorporating Both Production and 4D Seismic-Related Data into Reservoir Models Boucle de calage avancée pour construire des modèles de réservoir contraints par les données de production et les attributs sismiques 221 > Joint Inversion of Fracture Model Properties for CO 2 Storage Monitoring or Oil Recovery History Matching Inversion conjointe des propriétés d'un modèle de fractures pour le monitoring d'un stockage de CO 2 ou le calage d'un historique de production 237 > History Matching of Production and 4D Seismic Data: Application to the Girassol Field, Offshore Angola Calage simultané des données de production et de sismique 4D : application au champ de Girassol, Offshore Angola 263 > Monitoring of SAGD Process: Seismic Interpretation of Ray+Born Synthetic 4D Data Monitoring de procédé SAGD : interprétation sismique de données 4D synthétiques ray+Born 289 > Simultaneous Inversion of Production Data and Seismic Attributes: Application to a Synthetic SAGD Produced Field Case Inversion simultanée des données de production et des attributs sismiques : application à un champ synthétique produit par injection de vapeur Laboratory-Fluid Substitution and Pressure Effects Vérification expérimentale du modèle pétroélastique au laboratoire-Substitutions de fluides et effets de pression 319 > Impact of Fractures on CO 2 Storage Monitoring: Keys for an Integrated Approach Impact de la présence de fractures pour le monitoring des stockages de CO 2 : éléments pour une approche intégrée 329 > 4D Joint Stratigraphic Inversion of Prestack Seismic Data: Application to the CO 2 Storage Reservoir (Utsira Sand Formation) at Sleipner Site Inversion stratigraphique jointe 4D de données sismiques avant sommation : application au réservoir de stockage de CO 2 (Formation Utsira) du site de Sleipner

K. Labat (1) , N. Delépine (1) , V. Clochard (1) , P. Ricarte (1)

1 IFPEN - IFP Energies nouvelles

Seismic monitoring is commonly used in the oil industry to follow the evolution of reservoir properties during production. We present a methodology of time-lapse (or 4D) stratigraphic inversion, which is able to provide an estimation of P- and S-wave impedance variations in the reservoir by inverting prestack time-lapse seismic data. The 4D inversion is implemented in the time domain and requires a time scaling law for each repeated seismic dataset in order to adjust the arrival times of homologous events observed in the so-called reference and monitor datasets. This operation is often referred to as the warping problem. The 4D inversion is a 3-step methodology. The first step consists in inverting each seismic vintage independently, thus providing as many P- and S-wave impedance distributions as datasets considered. The second step uses the available P-wave impedance information to solve the warping problem which is crucial to the third and final step: the joint inversion of all available seismic vintages.This 4D inversion sequence was applied to seismic datasets recorded on the Norwegian CO2 storage reservoir of Sleipner field located in the North Sea. The latter is becoming a reference industrial site for the long-term storage of carbon dioxide (CO2) in a saline aquifer, the Utsira sand formation. We focused our 4D inversion study on the 1994 and 2006 vintages acquired two years before and ten years after the beginning of CO2 injection, respectively. The warping correction resulted in a time-scaling law with a maximum pushdown effect of about 45 ms at the base of the Utsira aquifer. The joint 4D inversion results show more consistency than the single 3D inversion results: the 4D inversion notably provides P-wave impedances for the CO2 -saturated sandstones which are close to the values derived from rock physics studies.

and available online here Cet article fait partie du dossier thématique ci-dessous publié dans la revue OGST, Vol. 67, n°2, pp. 187-372 et téléchargeable ici

Domaines: Physique [physics]

K. Labat, N. Delépine, V. Clochard, P. Ricarte. 4D Joint Stratigraphic Inversion of Prestack Seismic Data: Application to the CO2 Storage Reservoir (Utsira Sand Formation) at Sleipner Site. Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles, 2012, 67 (2), pp.329-340. ⟨10.2516/ogst/2012006⟩. ⟨hal-01936477⟩