CO_2驱油及其地震监测技术的国内外研究现状

Research status of CO_2 flooding and its seismic monitoring technologies

CO_2驱油是通过注气井将液态CO_2注入到地下储层,进而驱替油气到生产井的一项特殊采油技术,它不仅能提高采收率,而且还可以封存CO_2,减少碳排放,对环境保护和油田生产具有双重效益。结合课题研究,在文献调研的基础上,阐述了CO_2驱油技术的基本原理,总结了CO_2驱油技术的国内外发展现状,对CO_2驱油关键技术进行了分析,并重点对时移地震、井间地震、微地震、VSP及AVO等CO_2驱油地震监测技术进行了讨论,为CO_2驱油技术的应用提供了依据。

CO2 flooding is a special tertiary oil recovery technology which injects the liquid CO2 to subsurface reservoir by gas-injection wells, and then drives the oil and gas to producing wells. This technology can greatly enhanced oil recovery, and storage the C02 and reduce carbon emission. It is favorable both for environmental protection and oilfield production. Combining research project, based on a mass of literatures, this paper explained the fundamental principle of CO2 flooding, summarized the development of CO2 flooding, pointed out the main contents of rock physics fundamental analysis, and gave the principle and implementation steps of the displacement simulation experiment. This paper focused on discussing the major monitoring technologies, such as 4D seismic, borehole seismology, microseismic, AVO and VSP, which could provide basis for the application of CO2 flooding.