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首页> 外文OA文献 >Time-lapse walkaway vertical seismic profile monitoring for CO2 injection at the SACROC enhanced oil recovery field: A case study
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Time-lapse walkaway vertical seismic profile monitoring for CO2 injection at the SACROC enhanced oil recovery field: A case study

机译：在saCROC强化采油油田进行CO2注入的延时走向垂直地震剖面监测：案例研究

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摘要

Geologic carbon storage involves large-scale injections of carbon dioxide into underground geologic formations. Changes in reservoir properties resulting from CO2CO2 injection and migration can be characterized using monitoring methods with time-lapse seismic data. To achieve economical monitoring, vertical seismic profile (VSP) data are often acquired to survey the local injection area. We investigated the capability of walkaway VSP monitoring for CO2CO2 injection into an enhanced oil recovery field at SACROC, West Texas. VSP data sets were acquired in 2008 and 2009, and CO2CO2 injection took place after the first data acquisition. Because the receivers were located above the injection zone, only reflection data contain the information from the reservoir. Qualitative comparison between reverse-time migration images at different times revealed vertical shifts of the reflectors’ center, indicating the presence of velocity changes. We examined two methods to quantify the changes in velocity: standard full-waveform inversion (FWI) and image-domain wavefield tomography (IDWT). FWI directly inverts seismic waveforms for velocity models. IDWT inverts for the time-lapse velocity changes by matching the baseline and time-lapse migration images. We found that, for the constrained geometry of VSP surveys, the IDWT result was significantly more consistent with a localized change in velocity as expected from a few months of CO2CO2 injection. A synthetic example was used to verify the result from the field data. By contrast, FWI failed to provide quantitative information about the volumetric velocity changes because of the survey geometry and data frequency content.
机译：地质碳储存涉及将二氧化碳大量注入地下地质构造中。可以使用具有时移地震数据的监测方法来表征由CO2CO2注入和运移引起的储层性质变化。为了实现经济监控，通常需要获取垂直地震剖面（VSP）数据以调查本地注入区域。我们研究了在西德克萨斯州SACROC的增强型采油区中对CO2CO2注入进行VSP监控的能力。 VSP数据集分别于2008年和2009年获得，并且在首次获得数据后进行了CO2CO2注入。由于接收器位于注入区上方，因此只有反射数据包含来自储层的信息。在不同时间的逆时偏移图像之间的定性比较显示出反射镜中心的垂直偏移，表明存在速度变化。我们研究了两种量化速度变化的方法：标准全波形反演（FWI）和图像域波场层析成像（IDWT）。 FWI直接将地震波形反相以建立速度模型。 IDWT通过匹配基线和延时迁移图像来反转延时速度变化。我们发现，对于VSP调查的几何形状而言，IDWT的结果与注入CO2CO2几个月后预期的局部速度变化更加一致。使用一个综合示例来验证现场数据的结果。相反，由于调查的几何形状和数据频率内容，FWI无法提供有关体积速度变化的定量信息。

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