title: Measurement and Visualization of Tight Rock Exposed to CO2Using NMR Relaxometry and MRI.
abstract: Understanding mechanisms of oil mobilization of tight matrix during CO2injection is crucial for CO2enhanced oil recovery (EOR) and sequestration engineering design. In this study exposure behavior between CO2and tight rock of the Ordos Basin has been studied experimentally by using nuclear magnetic resonance transverse relaxation time (NMR T2) spectrum and magnetic resonance imaging (MRI) under the reservoir pressure and temperature. Quantitative analysis of recovery at the pore scale and visualization of oil mobilization are achieved. Effects of CO2injection, exposure times and pressure on recovery performance have been investigated. The experimental results indicate that oil in all pores can be gradually mobilized to the surface of rock by CO2injection. Oil mobilization in tight rock is time-consuming while oil on the surface of tight rock can be mobilized easily. CO2injection can effectively mobilize oil in all pores of tight rock, especially big size pores. This understanding of process of matrix exposed to CO2could support the CO2EOR in tight reservoirs.
authors.affiliation: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, 100083, China.|Petroleum Exploration &Production Research Institute (PEPRIS), Sinopec, Beijing, 100083, China.
authors.forename: Haitao
authors.initials: H
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, 100083, China.|Petroleum Exploration &Production Research Institute (PEPRIS), Sinopec, Beijing, 100083, China.
authors.forename: Zengmin
authors.initials: Z
authors.lastname: Lun
authors.affiliation: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, 100083, China.|Petroleum Exploration &Production Research Institute (PEPRIS), Sinopec, Beijing, 100083, China.
authors.forename: Chengyuan
authors.initials: C
authors.lastname: Lv
authors.affiliation: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, 100083, China.|Petroleum Exploration &Production Research Institute (PEPRIS), Sinopec, Beijing, 100083, China.
authors.forename: Dongjiang
authors.initials: D
authors.lastname: Lang
authors.affiliation: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, 100083, China.|Petroleum Exploration &Production Research Institute (PEPRIS), Sinopec, Beijing, 100083, China.
authors.forename: Bingyu
authors.initials: B
authors.lastname: Ji
authors.affiliation: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, 100083, China.|Petroleum Exploration &Production Research Institute (PEPRIS), Sinopec, Beijing, 100083, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Luo
authors.affiliation: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, 100083, China.|Petroleum Exploration &Production Research Institute (PEPRIS), Sinopec, Beijing, 100083, China.
authors.forename: Weiyi
authors.initials: W
authors.lastname: Pan
authors.affiliation: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, 100083, China.|Petroleum Exploration &Production Research Institute (PEPRIS), Sinopec, Beijing, 100083, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, 100083, China.|Petroleum Exploration &Production Research Institute (PEPRIS), Sinopec, Beijing, 100083, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Gong