考虑层状非均质性对CO<sub>2</sub>在海域咸水层中迁移过程及封存量的影响

乔翔宇; 王全荣

doi:10.19509/j.cnki.dzkq.tb20240365

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考虑层状非均质性对CO₂在海域咸水层中迁移过程及封存量的影响

更新时间：2026-11-05

- 考虑层状非均质性对CO₂在海域咸水层中迁移过程及封存量的影响
- Bulletin of Geological Science and Technology Vol. 44, Issue 4, Pages: 107-115(2025)
- 作者机构：
  
  中国地质大学(武汉)环境学院
- 作者简介：
- 基金信息：
- DOI：10.19509/j.cnki.dzkq.tb20240365
  CLC： P75;X701
- Online First：27 June 2025，
  
  Published：27 June 2025
- 稿件说明：
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乔翔宇, 王全荣. 考虑层状非均质性对CO₂在海域咸水层中迁移过程及封存量的影响[J]. Bulletin of Geological Science and Technology, 2025, 44(4): 107-115. DOI: 10.19509/j.cnki.dzkq.tb20240365.
DOI：

乔翔宇, 王全荣. 考虑层状非均质性对CO₂在海域咸水层中迁移过程及封存量的影响[J]. Bulletin of Geological Science and Technology, 2025, 44(4): 107-115. DOI: 10.19509/j.cnki.dzkq.tb20240365. DOI：

摘要

数值模拟是研究咸水层中CO

迁移机理及地质封存量的主要手段。然而，前人研究往往假设储层是规则且均质的长方体，并且关于CO

在海域咸水层中迁移过程的数值模拟研究鲜见报道。依托南海某储集体，考虑地层的非均质性与岩性圈闭的实际位置，利用地震反射特征和钻孔资料建立了非均质地质模型，采用TOUGHREACT软件模拟了不同注入位置对CO

在地层中迁移和封存的影响。结果表明：CO

向上迁移过程受到泥岩的阻挡，横向迁移更加显著。对于不同的注入方案，储层压力分布存在显著差异。在储层顶部注入时储层压力可达到40.1 MPa；在储层底部注入时，储层压力最高可达到39.7 MPa；当完整井注入时，储层的压力最高可达到40.3 MPa。因此完整井注入和顶部注入方案长期实行导致的压力积聚可能破坏储盖层结构，CO

泄露的风险更大，在储层底部和中部注入的方案更加安全。当持续注入100 a时，CO

以超临界相为主，占总封存量的77%以上。在相同的井口注入压力下，均质模型会高估储集体的封存量，非均质模型中在储层顶部注入和中部注入比底部注入分别多55.1%和49.3%。敏感性分析结果表明孔隙度和渗透率对结果的影响比毛管压力显著。研究查明了考虑储层的层状非均质性时注入井位置对CO

迁移机理和封存量的影响，可以为CO

封存的布井设计提供理论依据。

Abstract

Numerical modeling is a primary tool for studying the migration mechanisms and sequestration of CO2 in saline aquifers. However

previous studies often assume that reservoirs are regular rectangular shapes and homogeneous

with few reports on numerical simulations of CO2 migration in marine saline aquifers. Objective & MethodsThis study focuses on a reservoir in the South China Sea

taking into account the heterogeneity of the formation and the actual location of the lithological traps. The study establishes a heterogeneous geological model based on seismic reflection characteristics and drilling data

using TOUGHREACT to simulate the effects of different injection locations on CO2 migration and sequestration in the formation. ResultsThe results indicate that the upward migration of CO2 is hindered by mudstone

while lateral migration is more pronounced. For different injection scenarios

significant variations in reservoir pressure distribution were observed. The reservoir pressure reaches 40.1 MPa when injecting at the top

39.7 MPa at the bottom

and 40.3 MPa when injecting in a complete well. Therefore

the pressure buildup from long-term implementation of complete well injection and top injection schemes may damage the reservoir cap rock

increasing the risk of CO2 leakage. The bottom and middle injection schemes are safer. When injected continuously for 100 years

CO2 is predominantly in the supercritical phase

accounting for more than 77% of the total sequestration

with the dissolved phase making up less than 23%. At the same wellhead injection pressure

the homogeneous model overestimates the storage volume of the reservoir. The heterogeneous model injects 55.1% and 49.3% more CO2 at the top and middle

respectively

compared to the bottom. Sensitivity analysis results show that porosity and permeability have a more significant impact on the results than capillary pressure. ConclusionThis study aims to investigate the impact of injection well locations on CO2 migration mechanisms and storage capacity when considering the layered heterogeneity of the reservoir

with the aim of providing theoretical guidance for the design of well placement for CO2 storage.

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考虑层状非均质性对CO2在海域咸水层中迁移过程及封存量的影响

DOI：10.19509/j.cnki.dzkq.tb20240365

摘要

Abstract

关键词

Keywords

references

考虑层状非均质性对CO₂在海域咸水层中迁移过程及封存量的影响