Time-lapse seismic monitoring for enhanced oil recovery and carbon capture and storage field site at Cranfield field, Mississippi
dc.contributor.advisor | Bangs, Nathan Lawrence Bailey | |
dc.contributor.advisor | Meckel, Timothy Ashworth | |
dc.creator | Ditkof, Julie Nicole | en |
dc.date.accessioned | 2014-02-17T22:49:29Z | en |
dc.date.accessioned | 2017-05-11T22:42:07Z | |
dc.date.available | 2017-05-11T22:42:07Z | |
dc.date.issued | 2013-12 | en |
dc.date.submitted | December 2013 | en |
dc.date.updated | 2014-02-17T22:49:29Z | en |
dc.description | text | en |
dc.description.abstract | The Cranfield field, located in southwest Mississippi, is an enhanced oil recovery and carbon sequestration project that has been under a continuous supercritical CO₂ injection by Denbury Onshore LLC since 2008. Two 3D seismic surveys were collected in 2007, pre-CO₂ injection, and in 2010 after > 2 million tons of CO₂ was injected into the subsurface. The goal of this study is to characterize a time-lapse response between two seismic surveys to understand where injected CO₂ is migrating and to map the injected CO₂ plume edge. In order to characterize a time-lapse response, the seismic surveys were cross equalized using a trace-by-trace time shift. A normalized root-mean-square (NRMS) difference value was then calculated to determine the repeatability of the data. The data were considered to have “good repeatability,” so a difference volume was calculated and showed a coherent seismic amplitude anomaly located through the area of interest. A coherent seismic amplitude anomaly was also present below the area of interest, so a time delay analysis was performed and calculated a significant added velocity change. A Gassmann-Wood fluid substitution workflow was then performed at two well locations to predict a saturation profile and observe post-injection expected changes in compressional velocity values at variable CO₂ saturations. Finally, acoustic impedance inversions were performed on the two seismic surveys and an acoustic impedance difference volume was calculated to compare with the fluid substitution results. The Gassmann-Wood fluid substitution results predicted smaller changes in acoustic impedance than those observed from acoustic impedance inversions. At the Cranfield field, time-lapse seismic analysis was successful in mapping and quantifying the acoustic impedance change for some seismic amplitude anomalies associated with injected CO₂. Additional well log data and refinement of the fluid substitution workflow and the model-based inversion performed is necessary to obtain more accurate impedance changes throughout the field instead of at a single well location. | en |
dc.description.department | Geological Sciences | en |
dc.format.mimetype | application/pdf | en |
dc.identifier.uri | http://hdl.handle.net/2152/23200 | en |
dc.language.iso | en_US | en |
dc.subject | CO₂ sequestration | en |
dc.subject | Time-lapse | en |
dc.subject | 4D | en |
dc.subject | Carbon sequestration | en |
dc.title | Time-lapse seismic monitoring for enhanced oil recovery and carbon capture and storage field site at Cranfield field, Mississippi | en |