Experimental Study on Monitoring CO2 Sequestration by Conjoint Analysis of the P-Wave Velocity and Amplitude

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• 作者：Hao Chen ; Shenglai Yang ; Kangning Huan ; Fangfang Li ; Wei Huang ; Aiai Zheng ; Xing Zhang
• 刊名：Environmental Science & Technology
• 出版年：2013
• 出版时间：September 3, 2013
• 年：2013
• 卷：47
• 期：17
• 页码：10071-10077
• 全文大小：416K
• 年卷期：v.47,no.17(September 3, 2013)
• ISSN：1520-5851

文摘

CO₂ sequestration has been considered to be one of the most straightforward carbon management strategies for industrial CO₂ emission. Monitoring of the CO₂ injection process is one of the best ways to make sure the safety storage but is also a major challenge in CO₂ geological sequestration. Previous field and laboratory researches have shown that seismic methods are among the most promising monitoring methods because of the obvious reduction in P-wave velocities caused by CO₂ injection. However, as CO₂ injection continues, the P-wave velocity becomes increasingly insensitive according to the pilot projects when CO₂ saturation is higher than 20鈥?0%. Therefore, the conventional seismic method needs improvement or replacement to solve its limitations. In this study, P-wave velocity and amplitude responses to supercritical CO₂ injection in brine-saturated core samples from Jilin oilfield were tested using core displacement and an ultrasonic detection integrated system. Results showed that neither the P-wave velocity nor amplitude could simply be used to monitor the CO₂ injection process because of the insensitive or nonmonotonous response. Consequently, a new index was established by synthetically considering these two parameters to invert and monitor the CO₂ process, which can be thought of as a newer and more effective assessment criterion for the seismic method.