| Citation: | WU Xiaobin，QIANG Xiaolong，ZHANG Xiaoyan，et al. The effect of CO2 displacement on the pore structure of tight sandstones: a case study of the Chang7 member of the Yanchang formation of the Triassic in the Ordos Basin[J]. Bulletin of Geological Science and Technology，2026，45（2）：1-9 doi: 10.19509/j.cnki.dzkq.tb20240452
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CO2 flooding is an important method to improve the recovery efficiency of tight oil reservoirs. However, the diagenesis of tight sandstones is complex, and it is necessary to clarify the mechanisms behind the microstructural changes in tight sandstones with different cement characteristics during the CO2 flooding process.
In this study, CO2 flooding, casting thin sections, scanning electron microscopy, nuclear magnetic resonance,
The results show that the cementation of tight sandstone is complex and diverse. Clay minerals and carbonates are the main filling materials, with significant distribution differences. Cements can affect the mineralogical structure of tight sandstone and
Therefore, CO2 flooding has different effects on the pore structure of tight sandstones with varying types of cement. CO2 flooding leads to a more significant improvement in the physical properties of tight sandstones with high carbonate content compared to those with high clay content. These results provide new insights for the development and evaluation of tight sandstone reservoirs.
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