我国东南近海地区工农业发达,是主要的温室气体排放区域,减排压力日益严峻,但是陆上埋存潜力有限;同时我国南海勘探开发了大量的富含CO2 气藏,在天然气外输和终端处理过程中存在较大的减排压力.为此,针对近海大型近枯竭气田实施 CO2 封存的可行性进行研究:①分析了枯竭气田 CO2 封存的机理与优缺点;②通过国内外典型枯竭气藏 CO2 驱油与封存的实例的剖析,总结了其在实施策略、关键技术、实施效果方面的经验;③基于南海富含CO2 气藏减排需求与陆上排放源情况,评估了在海上近枯竭的 Y气田实施 CO2 封存的潜力.研究结果表明:近海接近枯竭的Y气田封存条件及源汇匹配条件较好,比较适宜开展陆上CO2 海洋封存先导实践探索,其理论埋存量可达3×108 t,能够满足邻近或联网高含CO2 油气藏的排放量的埋存需求.
Potential assessment and outlook on CO2 storage in classic depleted gas reservoirs of the South China Sea
Offshore southeastern China with well-developed agriculture and industry is the leading area for emitting greenhouse gas,and also faces pressure of emission reduction which has been a serious problem.But the potential for onshore storage is very scarce.Meanwhile,there are numerous gas reservoirs rich in carbon dioxide(CO2)in the South China Sea,which brings about the tremen-dous pressure to this reduction during natural-gas transportation and terminal processing.Therefore,a feasibility study was conducted on the implementation of CO2 storage in the border on large depleted gasfields in the offshore.Moreover,the mechanisms,advantages and disadvantages were discussed for such CO2 storage.Many experiences in implementation strategies and effects together with key technologies were summed up by analyzing CO2 flooding and storage practices in typical depleted gas reservoirs at home and abroad.On top of that,the storage prospects in the offshore nearly depleted Y gasfield were evaluated according to demands on the emission reduction to CO2-rich reservoirs in the South China Sea and the conditions of onshore emission source.Results show that this field boasts better conditions in storage and source-sink matching,making it suitable for the pilot test on offshore storage of onshore CO2.And the theoretical storage capacity of 3×108 t may meet storage needs of discharge amount in adjacent or online reservoirs with rich CO2.
South China SeaNearly depleted gas reservoirStorageSource-sink matchingCO2
万方数据
