Research on Whole Strata Geological Modeling Technology for CO2 Geological Storage in Salt Water Layer
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摘要: 咸水层CO2地质封存技术是实现我国“碳达峰、碳中和”目标的重要支撑技术，但目前基于油气开发目的的三维地质建模技术难于满足CO2地质封存的要求，咸水层CO2地质封存数值模拟以及安全性评价等需要从地面至目的层段全部地层，针对Subei盆地Gaoji地区（S盆地G地区），利用Petrel软件以及多种确定性、随机性建模方法开展从目的层到地表的全地层三维模型建模技术研究，主要成果如下：提出利用构造框架构造建模（Structural framework）方法解决由复杂的断层接触关系引起的各种断层建模问题，并利用阶梯状网格化方法解决全地层建模网格要求问题，使全地层模型网格数小于千万；提出在岩性模型约束下采用不同的地质统计学方法依次模拟得到孔隙度、渗透率等模型的方法；结合全地层地质模型特点，采用储层发育特征对比方法对GJ地区的全地层地质模型的精度进行了检验，总体认为本次GJ地区随机建模结果具较高的可信度.本次研究提出的全地层地质建模方法可以为咸水层CO2地质封存后期数值模拟以及安全检查提供可靠完整的地质模型，对咸水层CO2地质封存的发展具有重要意义.Abstract: The CO2 geological storage technology in salt water layer is an important supporting technology for achieving China's carbon peaking and carbon neutrality goals. However, the current 3D geological modeling technology based on oil and gas development purposes is difficult to meet the requirements of CO2 geological storage. Numerical simulation and safety evaluation of CO2 geological storage in salt water layers require a geological model of all strata from the ground to the target layer. Taking the Gaoji area of the Subei basin as an example, using Petrel software and various deterministic and stochastic modeling methods, it conducted research on the three-dimensional modeling technology of the entire strata from the target strata to the surface. The main achievements are as follows. Propose to use the Structural framework method to solve various fault modeling problems caused by complex fault contact relationships, and use the stepped grid method to solve the grid requirements for whole formation modeling. Propose a method of sequentially simulating porosity, permeability, and other models using different geostatistical methods under the constraint of lithological models, and ensure that the number of grids in the entire geological model is less than ten million. Based on the characteristics of the geological model of the entire formation, the accuracy of the geological model of the entire formation in the Gaoji area was tested using the comparison method of reservoir development characteristics. Overall, it is believed that the results of the random modeling in the Gaoji area have high credibility. The geological modeling method proposed in this study can provide a reliable and complete geological model for the numerical simulation and safety inspection of CO2 geological storage in salt water layers, which is of great significance for the development of CO2 geological storage in salt water layers.
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Key words:
- carbon /
- CO2 geological storage /
- salt water layer /
- geological modeling /
- Gaoji area /
- Subei basin /
- petroleum geology
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图 1 Jh凹陷构造区划及GJ地区构造位置
Fig. 1. Structural zoning of Jinhu depression and structural location map of Gaoji area
图 2 采用角点网格建模方法建立的GJ地区断层模型（箭头指向正北）
Fig. 2. Fault model in Gaoji area established using corner grid modeling method (arrow pointing due north)
图 3 采用构造框架构造建模方法建立的GJ地区断层模型（箭头指向正北）
Fig. 3. Fault model in Gaoji area established using structural framework modeling method (arrow pointing due north)
图 4 GJ地区层面模型（箭头指向正北）
Fig. 4. High level model of the region (arrow pointing due north)
图 5 GJ地区阶梯状网格化的断层模型（箭头指向正北）
Fig. 5. A stepped grid fault model in the Gaoji area (arrow pointing due north)
图 6 GJ地区全地层格架模型（箭头指向正北）
Fig. 6. The whole strata stratigraphic framework model of Gaoji area (arrow pointing due north)
图 8 GJ地区全地层砂泥岩岩性模型（箭头指向正北）
Fig. 8. Lithological model of sandstone and mudstone in the entire formation of Gaoji area (arrow pointing due north)
图 9 GJ地区全地层孔隙度模型（箭头指向正北）
Fig. 9. The porosity model of the entire formation in the Gaoji area (arrow pointing due north)
图 10 GJ地区全地层渗透率模型（箭头指向正北）
Fig. 10. The permeability model of the entire formation in Gaoji area (arrow pointing due north)
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