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中文摘要：
在分析大庆油田芳48特低渗透试验区块油藏烃类组成、原油及注入气体物性的基础上，通过室内注气驱油实验，研究了不同注入气体（二氧化碳、天然气和氮气）及注气压力对驱油效果的影响：实验结果表明，二氧化碳驱采收率最高，其次为天然气，氮气驱效果最差、随着注气压力的升高，注入能力增强，原油物性得到很好的改善，从而增加了地层原油采出程度。
英文摘要：
Based on the hydrocarbon compositions and physical property of oil and injected gas in special low -permeability test pilot of Fang 48 in Daqing oilfield, the influences of different injected gas （ carbon dioxide, natural gas, nitrogen gas） and injection pressure on displacement characteristics are studied according to gas injection experiments results. The results indicate that the recovery factor of carbon dioxide is the highest, natural gas is the second and nitrogen gas is the last. With the increase of injection pressure, the injection capacity is enhanced, the physical property of crude oil is improved and then the degree of reserve recovery is increased.
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