Citation: | WANG Zeyu,OU Chenghua,XIAO Furun,et al. Three-stage, three-category, three-dimensional characterization and evaluation of CO2 enhanced oil recovery and geological carbon storage[J]. Bulletin of Geological Science and Technology,2025,44(1):64-73 doi: 10.19509/j.cnki.dzkq.tb20230498 |
This study aims to propose a novel three-stage, three-category, three-dimensional characterization and evaluation method for CO2-enhanced oil recovery (EOR) and geological carbon storage (GCS).
This method assesses the suitability, oil recovery, and storage capacity of these projects while addressing the distinct phase differences in the mechanisms of CO2 EOR and GCS during the later stages of reservoir development. This method involves the classification of CO2 EOR and GCS suitability into three stages: 1) physical storage suitability classification based on the five-factor method; 2) physicochemical storage suitability classification based on the six-factor method; and 3) chemical storage suitability classification based on the six-factor method. Additionally, this method provides a three-dimensional characterization and evaluation of CO2 EOR and GCS. It includes a visualization-based classification and assessment of the CO2 oil recovery amount and storage capacity using the storage coefficient method. The proposed evaluation framework has been applied to a representative low-porosity and ultralow-permeability reservoir in eastern China.
The calculated CO2 oil recovery and storage capacity for the sample area are 648.24 tons and
The findings contribute to the scientific and rational planning and implementation of CO2 EOR and GCS projects, facilitating the sustainable development of oil and gas fields and enhancing resource utilization efficiency.
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