Petroleum Reservoir Evaluation and Development >
2025 , Vol. 15 >Issue 4: 545 - 553
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2025.04.002
Study on the influence of CO2-water-rock reactions under reservoir conditions on geochemical properties of sandstone reservoirs
Received date: 2024-07-09
Online published: 2025-07-19
Most oilfields currently using CO2 flooding in China have transitioned from water flooding to CO2 injection for development. Over prolonged periods, CO2-water-rock reactions can alter reservoir physical properties, becoming a key issue that must be addressed. To address limitations in existing studies—such as short reaction durations and unclear effects of environmental variables—this research used a high-temperature, high-pressure reactor to simulate reservoir conditions. Advanced equipment, including high-performance field-emission scanning electron microscope and X-ray diffraction, was utilized to study the effects and mechanisms of CO2-water-rock reactions on reservoir physical properties and mineral compositions under different environmental variables. The experimental results indicated that feldspar dissolution and clay mineral formation were the primary factors affecting reservoir physical properties after CO2-water-rock reactions. With increasing temperature, the water-rock reaction intensified, accelerating the dissolution of potassium feldspar, calcium feldspar, and sodium feldspar while increasing the proportion of kaolinite, thereby improving reservoir physical properties. When pressure increased, the dissolution of large amounts of CO2 lowered the solution pH and inhibited the transformation of minerals such as potassium feldspar and sodium feldspar into clay minerals like kaolinite, causing deterioration in overall reservoir physical properties. As the reaction time increased, the dissolution of feldspar and carbonate minerals intensified, leading to increased mass concentrations of major ions such as Na+, K+, Ca2+, an improvement in reservoir physical properties, and the precipitation of gypsum. Within the experimental range, the degree of mineral dissolution caused by CO2-water-rock reactions exhibited a positive correlation with temperature and time but a negative correlation with injection pressure. Finally, the experimental results were calculated using the Kozeny-Carman equation, indicating that within the experimental range, reservoir porosity and permeability are positively correlated with temperature and time, and negatively correlated with CO2 injection pressure. By studying the impact of CO2-water-rock reactions on reservoirs under different environmental variables, this study offers insights for the application of CO2 flooding to enhance oil recovery (EOR) in shale oil reservoirs.
ZHANG Chao , ZHU Pengyu , HUANG Tianjing , YAN Changhao , LIU Jie , WANG Bo , ZHANG Bin , ZHANG Yi . Study on the influence of CO2-water-rock reactions under reservoir conditions on geochemical properties of sandstone reservoirs[J]. Petroleum Reservoir Evaluation and Development, 2025 , 15(4) : 545 -553 . DOI: 10.13809/j.cnki.cn32-1825/te.2025.04.002
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