TY - JOUR
T1 - Time-lapse pre-stack seismic inversion with thin bed resolution for CO2 sequestration from Cranfield, Mississippi
AU - Zhang, Rui
AU - Sen, Mrinal K.
AU - Srinivasan, Sanjay
N1 - Funding Information:
This material is based upon work supported as part of the Center for Frontiers of Subsurface Energy Security, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0001114. We thank the National Energy Technology Laboratory (NETL) , the Southeast Regional Carbon Sequestration Partnership (SECARB) and Denbury Resources for providing support and data from Cranfield, and thanks to Dr. Susan D. Hovorka (BEG, GCCC). We thank Donald Vasco and Thomas Daley for editing the paper.
PY - 2014/1
Y1 - 2014/1
N2 - Time-lapse surface seismic surveys have been used for CO2 sequestration monitoring at Cranfield, Mississippi. The 3D time-lapse seismic data were recorded both before (2007) and after (2010) CO2 injection. The injection interval is the lower Tuscaloosa sandstone formation, which appears as a thin layer and displays weak signature due to CO2 injection in the post-stack seismic amplitudes. Previous studies have reported inversion of time-lapse acoustic impedances for CO2 plume mapping. However, the acoustic impedances lack elastic information, which are more sensitive to the fluid variation. To address this, we applied a basis pursuit pre-stack inversion on time-lapse Amplitude Versus Angle (AVA) datasets to obtain elastic properties (Vp, Vs, density and Vp-Vs ratio). The inverted elastic properties show improved resolution and provide reasonable fits to the well-log data. The temporal changes of inverted elastic properties provide a basis for mapping the CO2 plume after three years' injection, demonstrating their effectiveness for a CO2 sequestration study.
AB - Time-lapse surface seismic surveys have been used for CO2 sequestration monitoring at Cranfield, Mississippi. The 3D time-lapse seismic data were recorded both before (2007) and after (2010) CO2 injection. The injection interval is the lower Tuscaloosa sandstone formation, which appears as a thin layer and displays weak signature due to CO2 injection in the post-stack seismic amplitudes. Previous studies have reported inversion of time-lapse acoustic impedances for CO2 plume mapping. However, the acoustic impedances lack elastic information, which are more sensitive to the fluid variation. To address this, we applied a basis pursuit pre-stack inversion on time-lapse Amplitude Versus Angle (AVA) datasets to obtain elastic properties (Vp, Vs, density and Vp-Vs ratio). The inverted elastic properties show improved resolution and provide reasonable fits to the well-log data. The temporal changes of inverted elastic properties provide a basis for mapping the CO2 plume after three years' injection, demonstrating their effectiveness for a CO2 sequestration study.
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U2 - 10.1016/j.ijggc.2013.10.032
DO - 10.1016/j.ijggc.2013.10.032
M3 - Article
AN - SCOPUS:84889565550
SN - 1750-5836
VL - 20
SP - 223
EP - 229
JO - International Journal of Greenhouse Gas Control
JF - International Journal of Greenhouse Gas Control
ER -