On seismic monitoring of the scope of CO2 storage in the seabed saline aquifers: Taking the Sleipner CCS project as an example
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摘要:
咸水层封存占CO2封存潜力的98%，过去针对CO2海底咸水层波及范围四维地震监测的研究多是通过时延地震资料之间的差异性进行定性分析，缺少测井资料的约束。本文基于Sleipner咸水层CO2封存项目采集的测井和四维地震资料，对CO2海底咸水层封存波及范围地震监测方法进行研究。通过岩石物理建模，应用井控地震属性分析技术研究CO2注入过程中CO2-盐水两相介质变化引起的各向异性响应特征，优选对CO2饱和度变化敏感的地震属性，通过地震正反演相结合的多属性分析实现对时移CO2咸水层封存波及范围监测。研究发现随着CO2饱和度的增加，饱和岩石的体积模量、体积密度、纵波速度和横波速度均有所下降，正演模拟结果中总体振幅升高，且随着CO2注入量的增加，其振幅变化幅度减小，均方根振幅属性对CO2饱和度变化最为敏感。在注入期间，CO2在层内主要沿SSW-NNE运移，并在构造高部位聚集；垂向上，CO2从注入点向上层运移，下层达到最大波及范围的时间早于上层，结合储层性质和构造解释结果，CO2在储层内的波及范围主要受各项异性渗透率和构造高低控制。
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关键词:
- CO2海底咸水层封存 /
- 地震监测 /
- 正演模拟 /
- 属性分析
Abstract:CO2 saline aquifer sequestration accounts for 98% of the total sequestration potential. In the past, most of the studies on 4D seismic monitoring of the CO2 seabed saline aquifer spread range were qualitatively analyzed by the variability of time-delayed seismic data, which lacked the constraints of well-logging data. Therefore, seismic monitoring methods for the spread range of CO2 seabed saline aquifer storage based on the logging and 4D seismic data collected by the Sleipner Saline Aquifer CO2 Sequestration Project in Norway were investigated. Based on the logging and 4D seismic data collected in the project, the anisotropic response characteristics caused by the change of the CO2-saline two-phase medium in the process of CO2 injection were studied by rock physics modelling, the technique of well control seismic attribute analysis was applied, the seismic attributes that are sensitive to the change of the saturation degree of CO2 were selected, and the seismic forward and inverse analysis were combined to better understand the time-shifted CO2 saline aquifer spread range. Results show that the bulk modulus, bulk density, primary wave velocity, and shear wave velocity of the saturated rocks decreased with the increase of CO2 saturation, the overall amplitude increased in the forward simulation results, the amplitude changes decreased with the increase of CO2 injection, and the root-mean-square (RMS) amplitude attribute was the most sensitive to the change of CO2 saturation. During the injection period, CO2 was mainly transported along the SSW-NNE and accumulates in the higher part of the tectonic structure. Vertically, CO2 was transported from the injection point to the upper layer, and the lower layer reached the maximum spread range earlier than the upper layer. Combined with the nature of the reservoir and the structural interpretation results, the spreading range of CO2 in the reservoir was controlled by mainly the anisotropic permeability and the structural high or low levels.
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表 1 15/9-A-16井不同深度岩芯样本主要岩石和碎屑成分百分比
Table 1. Percentage of major rock and debris compositions in core samples from Wells 15/9-16 at different depths
碎屑含量/% 850～860 m 890～900 m 1000 ～1010 m石英 50.7 66.7 76.7 长石 7.3 3.7 2.7 方解石 18 17 7.7 页岩 4.3 1 4.7 
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表 2 储层中矿物成分和流体的弹性模量及密度
Table 2. Elastic modulus and density of mineral components and fluids in reservoirs
体积模量/GPa 剪切模量/GPa 密度/(g/cm3) 石英 37.00 44.00 2.65 长石 37.50 15.00 2.70 方解石 76.80 32.00 2.71 盐水 2.30 0 1.03 CO2 0.075 0 0.70
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