Saline aquifer distribution and CO2 geological storage potential evaluation of the Zhifang Formation, Northeastern Ordos Basin

LI Peng; QU Hongjun; SUN Xiaohan; YANG Xuechao; JI Xiang; ZHU Rongxing

doi:10.16152/j.cnki.xdxbzr.2025-05-007

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Saline aquifer distribution and CO₂ geological storage potential evaluation of the Zhifang Formation, Northeastern Ordos Basin

更新时间：2025-10-31

- Saline aquifer distribution and CO₂ geological storage potential evaluation of the Zhifang Formation, Northeastern Ordos Basin
- Journal of Northwest University (Natural Science Edition) Vol. 55, Issue 5, Pages: 1024-1036(2025)
- 作者机构：
  
  1.西北大学　地质学系，陕西　西安　710069
  2.西北大学　榆林碳中和学院，陕西　西安　710069
  3.二氧化碳捕集与封存技术国家地方联合工程研究中心，陕西　西安　710069
  4.陕西省碳中和技术重点实验室，陕西　西安　710069
  5.国能榆林化工有限公司，陕西　榆林　719000
- 作者简介：
- 基金信息：
- DOI：10.16152/j.cnki.xdxbzr.2025-05-007
  CLC： TE121
- Received：11 June 2025，
  
  Published：25 October 2025
- 稿件说明：
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LI Peng, QU Hongjun, SUN Xiaohan, et al. Saline aquifer distribution and CO₂ geological storage potential evaluation of the Zhifang Formation, Northeastern Ordos Basin[J]. Journal of northwest university (natural science edition), 2025, 55(5): 1024-1036.
DOI：

LI Peng, QU Hongjun, SUN Xiaohan, et al. Saline aquifer distribution and CO₂ geological storage potential evaluation of the Zhifang Formation, Northeastern Ordos Basin[J]. Journal of northwest university (natural science edition), 2025, 55(5): 1024-1036. DOI： 10.16152/j.cnki.xdxbzr.2025-05-007.

摘要

咸水层地质封存为有效的碳中和储备手段，鄂尔多斯盆地东北部纸坊组埋深适中，钻井成本相对较低，且与石油、天然气开发层位不存在冲突，对其咸水层发育分布规律及咸水层CO

地质封存潜力的研究，对开展研究区内CO

咸水层地质封存工程具有实践意义。纸坊组储层岩石类型主要为中粒岩屑长石砂岩和长石岩屑砂岩，填隙物均以胶结物为主，胶结物以蒙皂石、伊/蒙混层、绿/蒙混层为主。纸坊组平均孔隙度为12.55%，渗透率为4.54 mD，为低孔特低渗储层，孔隙类型主要为溶蚀粒间孔，溶蚀粒内孔次之，纸坊组平均最大孔喉半径为7.04 μm，平均中值半径为0.25 μm。纸坊组纸3段咸水层单层平均厚度6.7 m，累计厚度平均为15.6 m，纸4段咸水层单层平均厚度为5.1 m，累计厚度平均为11.7 m。咸水层厚度高值区受分流河道砂体控制，呈北北东向条带状分布。研究区纸坊组总封存量为13 461×10

t，西部计算单元埋深较大，储层温度和压力增大，储层状态下的CO

密度相较于东部增加，封存潜力更大。

Abstract

geological storage in saline aquifers is an effective carbon neutrality technology. The Zhifang Formation has a moderate burial depth

relatively low drilling costs

and does not conflict with oil and gas development. Research on the development and distribution patterns of its saline aquifers and the potential for CO

geological storage in these aquifers has practical significance for implement CO

saline aquifer geological storage projects in the study area. The main rock types of the Zhifang Formation reservoir are medium-grained lithic feldspar sandstone and feldspathic lithic sandstone

with pore fillings primarily composed of cement

mainly montmorillonite

illite/montmorillonite mixed layers

and chlorite/montmorillonite mixed layers. The Zhifang Formation has an average porosity of 12.55% and permeability of 4.54 mD

classifying it as a low-porosity and ultra-low permeability reservoir. The main pore t

ypes are dissolution intergranular pores

followed by dissolution intragranular pores. The average maximum pore throat radius of the Zhifang Formation is 7.04 μm

with an average median radius of 0.25 μm. The pore distribution concentration in the 5th member of the Qian Formation is higher than that of the Zhifang Formation. The average single-layer thickness of the saline aquifer in the 3rd member of the Zhifang Formation is 6.7 m

with an average cumulative thickness of 15.6 m. The average single-layer thickness of the saline aquifer in the 4th member is 5.1 m

with an average cumulative thickness of 11.7 m. The high-value areas of the Zhifang Formation saline aquifer thickness are controlled by distributary channel sand bodies

showing a north-northeast trending strip distribution. The total storage capacity of the Zhifang Formation in the study area is 13 461×10

tons. Due to the greater burial depth in the western part of the study area

resulting in higher reservoir temperature and pressure

the CO

density is increased compared to the eastern part

leading to greater storage potential.

关键词

Keywords

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