Abstract:

Oil reservoir has become an important way for CO₂ storage, while the injection of CO₂ to reservoir can also improve the oil recovery. According to Yanchang oilfield reservoir characteristics, an evaluation model for CO₂ storage was established using the formation storage, bound storage, dissolved storage and mineralization mechanism. The model was established under the consideration of CO₂ dissolution in the oil, CO₂ dissolution in formation water and free gas storage. The model was used to evaluate the CO₂ storage potential for Yanchang oilfield. The results show that the model can predict reservoir storage capacity, and the reservoir CO₂ storage stock is about 209.879×104 t. The reservoir shows very good storage potential, which can provide important basis for CO₂ displacement of Yanchang oilfield.

Key words: CO₂, Yanchang oilfield, Storage potential, Evaluation model

摘要： 目前,油藏已经成为CO₂ 埋存的重要场所,向油藏注入CO₂ 的同时可以提高原油采收率。根据延长油田靖边CO₂ 试验区储层物性特征,利用构造地层埋存、束缚埋存、溶解埋存及矿化埋存等机理,考虑CO₂ 在原油中溶解、CO₂ 在地层水中溶解及自由气的埋存,建立评价CO₂ 埋存量的模型,通过所建立的模型可以评价延长油田
靖边CO₂ 试验区埋存潜力。模型应用结果表明,靖边CO₂ 试验区CO₂ 埋存量可达209.879×104t,储层CO₂ 埋存量大,具有非常好的埋存潜力,为延长油田进行CO₂ 驱提供了重要的指导。

关键词: CO₂, 延长油田, 埋存潜力, 评价模型