| 砂岩含水层CO2封存中考虑盐沉淀反馈作用的数值模拟:以鄂尔多斯盆地为例 |
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| 引用本文： | 高志豪,赵锐锐,成建梅.砂岩含水层CO2封存中考虑盐沉淀反馈作用的数值模拟:以鄂尔多斯盆地为例[J].地质科技通报,2022,41(1):269-277. |
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| 作者姓名： | 高志豪 赵锐锐 成建梅 |
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| 作者单位： | 中国地质大学（武汉）环境学院 |
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| 基金项目： | 国家自然科学基金项目41402212国家自然科学基金项目U1911205 |
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| 摘 要： | 盐沉淀是含水层CO2封存中需要关注的问题。当前,大多数数值模拟没有考虑盐沉淀引起的地层孔隙度和渗透率变化对流体流动的反馈作用。以鄂尔多斯盆地刘家沟组地层为例,利用TOUGH2软件建立了一个二维模型。通过修改程序源代码,使得模型能考虑盐沉淀对流体流动的反馈作用。模拟结果表明,刘家沟组地层在CO2注入20 a时,盐沉淀的反馈作用使得注入井附近地层压力提升达到了0.87MPa,储层注入性损失7.17%。地层水盐度对盐沉淀及其反馈作用的影响最大,CO2注入速度的影响次之,地层渗透率的影响最小。在地层水盐度较高时,固体盐饱和度显著增加,从而造成地层渗透率明显下降。当地层水盐度为0.24时,盐沉淀造成注入性损失45.32%,引起的地层压力提升达到了12.14MPa。因此,需要特别关注高盐度地层水引起的盐沉淀及其反馈作用。
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| 关 键 词： | CO2地质封存 盐沉淀 渗透率降低 地层压力 注入性 TOUGH2 |
| 收稿时间： | 2021-04-22 |
Numerical simulation of CO2 sequestration in sandstone aquifers with feedback effect of salt precipitation: A case study of Ordos Basin |
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| Gao Zhihao,Zhao Ruirui,Cheng Jianmei.Numerical simulation of CO2 sequestration in sandstone aquifers with feedback effect of salt precipitation: A case study of Ordos Basin[J].Bulletin of Geological Science and Technology,2022,41(1):269-277. |
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| Authors: | Gao Zhihao Zhao Ruirui Cheng Jianmei |
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| Affiliation: | (School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430078,China) |
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| Abstract: | Salt precipitation is an important issue for CO2 sequestration in deep aquifers.At present, most numerical simulations ignore the feedback effect of the changes in the porosity and permeability caused by the salt precipitation on fluid flow.In this paper, taking Liujiagou Formation in Ordos Basin as an example, a two-dimensional model is established using TOUGH2 code.By modifying the source code of the program, the model can consider the feedback effect of salt precipitation on fluid flow.The simulation results show that after the CO2 injection into the Liujiagou Formation for 20 years, salt precipitation makes the formation pressure near the injection well increase by 0.87MPa and the corresponding injectivity loss of the formation is 7.17%.The salinity has the greatest influence on salt precipitation and its feedback, followed by CO2 injection rate, and permeability has the least influence.When the salinity is high, solid salt saturation increases significantly, resulting in a great decrease in the permeability.In this study, when the salinity was 0.24, the salt precipitation caused an injectivity loss by 45.32% and the pressure buildup up to 12.14 MPa.Therefore, special attention should be paid to the salt precipitation caused by high salinity and its feedback effect during CO2 storage. |
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| Keywords: | CO2geological storage salt precipitation permeability decrease formation pressure injectivity TOUGH2 |
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