Monitoring on CO2 migration in a tight oil reservoir during CCS-EOR in Jilin Oilfield China
Monitoring on CO2 migration in a tight oil reservoir during CCS-EOR in Jilin Oilfield China
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DOI：
10.1016/j.energy.2016.01.028
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发表时间：
2016-03-01
期刊：
影响因子：
9
通讯作者：
Zhang, Hua
中科院分区：
文献类型：
--
作者：
Ren, Bo;Ren, Shaoran;Zhang, Hua
吉林油田正在中国开展大规模的CO2 FOR（提高采收率）和封存示范项目。H59油区北部渗透率为3.5 mD，孔隙度为12.7%，将附近天然气储层分离出的CO2 （CO2 15 ~ 30 mol%）注入。经过大约6年的运行，已向天然裂缝发育良好的薄油层注入了近26万吨CO2（烃类孔隙体积0.32 HCPV）。为了跟踪油藏中CO2的运动，实施了微地震监测程序，绘制了CO2流动的各向异性并估计了其波及效率。还进行了气体示踪剂测试，以检查井间连通性。实时分析了采出CO2的时间变化，监测了生产井的动态响应。结果表明，微震技术可成功探测薄油层中CO2的运移，反演得到的CO2扫描剖面与生产井的产气量及储层岩石物性吻合较好。(C) 2016 Elsevier Ltd.版权所有。
Jilin Oilfield is conducting a large-scale demonstration project on CO2 FOR (enhanced oil recovery) and storage in China. CO2 separated from a nearby natural gas reservoir (15-30 mol% CO2) is injected into the northern part of H59 oil block with permeability and porosity of 3.5 mD and 12.7%, respectively. After about six years of operation, nearly 0.26 million tons of CO2 (0.32 HCPV (hydrocarbon pore volume)) has been injected into the thin oil layers with well-developed natural fractures. In order to track the movement of CO2 in the oil reservoir, a microseismic monitoring program has been implemented to map the CO2 flow anisotropy and estimate its sweeping efficiency. Gas tracer testing has also been conducted to examine the inter-well connectivity. The temporal change of produced CO2 has been analyzed in a real-time mode to monitor the dynamic response in production wells. It is demonstrated that the migration of CO2 in the thin oil layers can be successfully detected by the microseismic technique, and the sweeping profiles of CO2 obtained from the inverted microseismic are in good agreement with the produced CO2 rate from production wells as well as the reservoir's petrophysical properties. (C) 2016 Elsevier Ltd. All rights reserved.