关键词: 美国, 老油田, 残油区（ROZ）, 二?氧?化?碳?气?驱?强?化?采?油?（C?O?2?-?E?O?R）, 资源潜力

Abstract: The United States has made significant progress in development of residual oil zone following the successes in development of shale gas and tight oil. Based on the assessment made by Melzer Consulting Firm, development of US residual oil zone is expected to increase recoverable oil reserve by 30-50 percent. It is the next strategic replacement zone for substantial increase of reserve and production. This paper makes briefings about definition and sourcing of residual oil zone as well as the characteristics and potential of reservoirs. It also evaluates the present conditions and development potential of US residual oil zone and discusses exploration and development technology and its future development orientation. Exploration and development of residual oil zone has shown a great potential of resources and a promising prospect for development though it is just in its preliminary stage. The main CO2-EOR technology is advantageous both in increase of oil production and protection of the environment. It not only opens up a new way for old oilfields to increase their oil production but also provides a new target area for CO2 burial and storage.

Key words: the United States, old field, residual oil zone, CO2-EOR, potential of resources