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| 苏北盆地盐城组咸水层CO2 地质封存泄漏风险的全局敏感性分析 | |
| 引用本文： | 郑菲,施小清,吴吉春,赵良,汪传胜.苏北盆地盐城组咸水层CO2 地质封存泄漏风险的全局敏感性分析[J].高校地质学报,2012,18(2):232-238. |
| 作者姓名： | 郑菲 施小清 吴吉春 赵良 汪传胜 |
| 作者单位： | 表生地球化学教育部重点实验室，南京大学 地球科学与工程学院 |
| 基金项目： | 国家自然科学基金，江苏省科技厅产学研联合创新资金 |
| 摘 要： | 基于对苏北盆地盐城组下段沉积旋回地层概化，建立了一个含有断层的二维剖面模型，采用TOUGH2/ECO2N 程序对 注入到深部咸水层中CO2 的运移分布特征及沿断层的泄漏过程进行了数值模拟。结果表明，尽管盐城组下段地层具有3层旋 回结构且砂岩层属高孔高渗储层，但由于泥层厚度较小且渗透率相对较高，多层封盖效果不佳。在存在导通断层时，CO2 泄露风险较大。应用Morris 法以断层中气相CO2 总量作为输出变量，对模型参数进行了全局敏感性分析。研究显示，当仅 改变断层参数时，与毛细压力相关的参数对气相CO2 沿断层泄漏影响程度最高；当考虑系统参数整体变化时则以砂岩含水 层和泥岩的渗透率敏感性最高，其次为与毛细压力相关的参数（进气压力、残余液体饱和度及孔隙分布指数）。两种情形下 孔隙度与盐度的敏感性均很小。 |
| 关 键 词： | 苏北盆地 CO2地质封存 断层泄露 全局敏感性分析 Morris法 |
Global Sensitivity Analysis of Leakage Risk for CO2 Geological Sequestration in the Saline Aquifer of Yancheng Formation in Subei Basin |
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| ZHENG Fei , SHI Xiaoqing , WU Jichun , ZHAO Liang , WANG Chuansheng.Global Sensitivity Analysis of Leakage Risk for CO2 Geological Sequestration in the Saline Aquifer of Yancheng Formation in Subei Basin[J].Geological Journal of China Universities,2012,18(2):232-238. | |
| Authors: | ZHENG Fei SHI Xiaoqing WU Jichun ZHAO Liang WANG Chuansheng |
| Institution: | Key Laboratory of Surficial Geochemistry, Ministry of Education; School of Earth Science and Engineering,; Nanjing University, Nanjing |
| Abstract: | TOUGH2/ECO2N code was used to simulate transportation of CO2 plume in the deep saline aquifer of lower part of the Yancheng Formation in Subei basin. A fault was added to the conceptual model to evaluate the leakage risk after CO2 injection. Simulation results indicate that the effect of multilayer capping for CO2 sequestration is not good because of the clay strata with small thickness and relatively high permeability, although the lower part of the Yancheng Formation has three sequences’ structure (multiple sand-clay layers) and the sand stratum has high permeability and high porosity. Especially when there is a fault conducting all layers the leakage risk for CO2 geological sequestration is significant. Morris method was used to analyze the global sensitivity of the parameters for two scenarios. When only the fault parameters are changed, the parameters related with the capillary pressure have great effect on CO2 leakage along the fault. When all the parameters of fault, sand and clay strata arevaried, the permeability of sand and clay has the highest sensitivity for the leakage risk, while the parameters related with the capillary pressure are secondary. For both scenarios, the sensitivity of porosity and salinity is very small. |
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