Review on the application of nuclear magnetic resonance technology in carbon dioxide geological sequestration and utilization
Geological storage and utilization of carbon dioxide is one of the key technologies to promote"carbon peaking and carbon neutrality".Studying the migration law of the whole process of CO2 injection-migration-storage and obtaining reservoir porosity,permeability,saturation,three-dimensional pore structure and rock mechanics parameters in the process of CO2 injection is the core work to monitor the state of CO2 geological storage and the risk of CO2 leakage.This paper aims to analyze the application status and development trend of nuclear magnetic resonance technology in studying pore structure,CO2 migration characteristics and rock mechanical parameter changes.Based on a brief introduction of nuclear magnetic resonance equipment and application fields,this paper analyzes the application status and development direction of nuclear magnetic resonance technology in CO2 geological storage and utilization.The analysis shows that nuclear magnetic resonance technology is widely used in the development of unconventional oil and gas resources such as tight oil and shale gas.It can quantitatively characterize reservoir physical property,saturation and three-dimensional pore structure,and can measure reservoir fluid migration parameters.At present,there are few studies on the determination of core dynamic parameters under the condition of in situ CO2 dissolution by using nuclear magnetic resonance technology.No matter CO2 displacement or CO2 replacement of CH4,the distribution characteristics of CO2 are indirectly reversed by measuring the changes of Nuclear Magnetic Resonance(NMR)characteristics or NMR imaging characteristics of hydrogen nuclei.In the pilot experimental projects of CO2-EOR and CCS,Limited time shift logging data restricts the qualitative or quantitative characterization of in situ CO2 dissolve-migration and mineralization NMR.There are relatively few NMR characterization experiments of in situ CCS/CCUS process in saline layer.Existing research results are mostly concentrated in the research fields of CO2 displacement CH4 in coal seams and competitive adsorption of CO2 and CH4.The corresponding characterization model between the NMR response signal of CO2 dissolution and the NMR resonance response signal after CO2 injection has not been established,which restricts the application of NMR logging in CO2 geological sequestration and utilization.Therefore,it is necessary to conduct NMR characterization technology research on the whole process of in-situ CO2 injection core,and to establish NMR characterization model of in-situ CO2 geological sequestration and utilization with CT real-time scanning system,so as to provide important technical support for dynamic monitoring and safety evaluation of CO2 geological sequestration and utilization with time-shift NMR logging.
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