Application of Time Reversed Imaging in Downhole Microseismic Monitoring for Fast SAGD Start–Up Enhancement of Heavy Oil Reservoir in Fengcheng Oil Field
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摘要:
蒸汽辅助重力泄油（SAGD）快速预热技术利用短时间的注入高压蒸汽在生产井和注入井之间形成一个高孔隙度和高渗透率的扩容蒸汽腔，其几何形态与扩展规律可由微地震技术进行监测和描述。笔者选取风城重油油田的一组SAGD快速预热注入与生产井组进行井下微地震监测，采用三维弹性波逆时干涉震源定位算法获取弱微地震事件的空间分布，定量计算高温蒸汽注入期间形成蒸汽腔体的长度、宽度、高度、方位和扩容体积，对蒸汽腔体几何形态和震级能量分布的动态变化进行分析，探讨蒸汽腔前缘在深度上针对非均质性夹层的延伸趋势与形态。研究结果表明，注入井与生产井之间已经联通，且扩容区域已部分延伸至油层底界面。此外，注入井上方储层产生了较多的微地震事件，表明本次施工已击破注入井上方的非均质物性夹层，完成了注入井上方储层改造的任务。
Abstract:Fast SAGD start−up enhancement technique injects the high−pressure steam in short time to build a high−temperature steam chamber with high porosity and permeability. In this study, downhole microseismic monitoring was performed in a fast SAGD start−up enhancement well group of heavy oil reservoir in Fengcheng oil field to delineate the geometric and dynamic propagation characteristics of formed steam chamber. Time reversed imaging method was applied to obtain the weak event locations with high accuracy. The quantitative estimation of length, width, height, azimuth and volume of the steam chamber was also estimated based on the event locations. The variation of steam chamber geometric and energy distribution with dates were also analyzed. The propagation characteristics of steam chamber front in depth direction respect to heterogeneous interlayer was also studied. The microseismic monitoring results demonstrates that the injection well and production well has been connected and the expansion area has partially extended to the bottom of the oil layer interface. In addition, amount of microseismic events were found above the injection well which suggests the steam has break the heterogeneous interlayer. Therefore, the reservoir has been successfully stimulated. Finally, the fitting relationship between steam chamber geometry characteristics and injection dates has been obtained based on the microseismic monitoring results, which provides significantly theoretical and practical foundation for the design and optimization of fast SAGD start−up enhancement in the studied area.
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表 1 SAGD蒸汽腔几何参数随时间变化表
Table 1. Geometric parameters of SAGD steam chamber with various date
日期 蒸汽腔网络长（m） 蒸汽腔网络宽（m） 蒸汽腔网络高（m） 蒸汽腔
网络方位累积事
件个数蒸汽腔体积（m3） 9月25日 215.14 51.64 1.04 NE113.78° 4 0.11×105 9月26日 296.26 100.91 2.31 NE98.10° 11 0.69×105 9月27日 570.32 107.04 5.24 NE95.99° 23 3.20×105 9月28日 570.19 127.85 10.56 NE95.21° 33 7.70×105 
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