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CO2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CO2地质封存潜力的研究，对开展研究区内CO2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7.04μm,平均中值半径为0.25μm。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13 461×104 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CO2密度相较于东部增加，封存潜力更大。
Abstract：CO2 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 CO2 geological storage in these aquifers has practical significance for implement CO2 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 types 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 13 461×104 tons. Due to the greater burial depth in the western part of the study area, resulting in higher reservoir temperature and pressure, the CO2 density is increased compared to the eastern part, leading to greater storage potential.
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基本信息:
DOI：10.16152/j.cnki.xdxbzr.2025-05-007
中图分类号:X701
引用信息:
[1]李鹏,屈红军,孙晓晗,等.鄂尔多斯盆地东北部纸坊组咸水层分布及CO_2地质封存潜力评价[J].西北大学学报(自然科学版),2025,55(05):1024-1036.DOI:10.16152/j.cnki.xdxbzr.2025-05-007.
基金信息:
西北大学碳中和学院科技项目(YL-2022-38-1); 国家能源集团2021年度十大重点科技攻关项目(GJNY-21-51)