Potential Evaluation of CO2 Sequestration and Enhanced Oil Recovery of Low Permeability Reservoir in the Junggar Basin, China

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• 作者：Huan Wang ; Xinwei Liao ; Xiangji Dou ; Baobing Shang ; Heng Ye ; Dongfeng Zhao ; Changlin Liao ; Xiaoming Chen
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：May 15, 2014
• 年：2014
• 卷：28
• 期：5
• 页码：3281-3291
• 全文大小：564K
• 年卷期：v.28,no.5(May 15, 2014)
• ISSN：1520-5029

文摘

The Chinese government is seeking CO₂ gas emission reduction measures. CO₂ capture and geological sequestration is one of the main measures. Injecting CO₂ into oil reservoirs can not only achieve the environmental protection purpose of CO₂ geological sequestration but also improve oil recovery and realize economic benefits, which helps to offset the cost of CO₂ sequestration. Therefore, the oil reservoir is one of the best sites for CO₂ sequestration. As for the reservoir of CO₂ flooding after water flooding, there are two methods for evaluating the potential of CO₂ enhanced oil recovery (EOR) and sequestration capacity, which are the mass balance method and analogy method. Through a combination of these two methods, this paper presents a new method, which can be reasonably used to evaluate these potentials. Besides, the screening criteria of CO₂ sequestration and EOR in the Junggar Basin are also proposed. On the basis of the guidelines of CO₂ source matching, reservoir characteristics, and fluid characteristic, four typical low permeability reservoirs (Caiman oil reservoir, Karamay oil reservoir, Beisantai oil reservoir, and Luliang oil reservoir) of the Junggar Basin are selected to study their potential of CO₂ EOR and sequestration. And then the potential of CO₂ EOR and sequestration capacity for the Junggar Basin oil reservoirs of CO₂ flooding after water flooding is studied by applying the method mentioned above. For 275 development blocks of 24 oil fields in the Junggar Basin, 139 development blocks are suitable for CO₂ miscible flooding EOR and sequestration, whereas 136 development blocks are suitable for CO₂ immiscible flooding EOR and sequestration. The total EOR potential could be 18鈥?07.76 脳 10⁴ t and the CO₂ sequestration potential could amount to 47鈥?86.0 脳 10⁴ t. The evaluation results show that the Junggar Basin鈥檚 oil reservoirs are suitable sites for CO₂ EOR and sequestration and have great potentials. It can provide the decision basis for the future implementation of CO₂ emission reduction projects in Western China.