鄂尔多斯盆地山西组地下咸水CO<sub>2</sub>溶解能力

胡丽莎; 常春; 于青春

doi:10.3799/dqkx.2012.033

鄂尔多斯盆地山西组地下咸水CO₂溶解能力

doi: 10.3799/dqkx.2012.033

中国地质大学水资源与环境学院, 北京 100083

基金项目:

国家自然科学基金项目 40772208

中央高校基本科研业务基金 2011YYL147

详细信息

作者简介:
胡丽莎(1986-), 女, 硕士研究生, 主要从事CO₂地质储存研究.E-mail: lisahu1986@163.com

中图分类号: X143
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出版历程
- 收稿日期: 2011-06-20
- 刊出日期: 2012-03-15

CO₂ Solubility in Shanxi Formation Water of Ordos Basin

School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China

摘要

摘要: 实施CO₂的地质储存是目前公认的减缓全球变暖的有效途径之一.潜在的储存场所包括衰竭的油气藏、深部不可开采煤层及深部咸水层.其中, 深部咸水层储存潜力最大.在发挥作用的诸多机理中, 溶解埋存具有埋存量大、作用时间较长以及安全性高的特点.在评价深部咸水含水层CO₂溶解储存潜力时, 溶解度是一个关键参数.提出了测定咸水含水层地层水CO₂溶解度的方法, 并将其实际应用于鄂尔多斯盆地山西组地层水.鄂尔多斯盆地是我国重要的能源基地, CO₂排放量大, 排放浓度高.采集了野外实地水样, 进行了化学成分分析, 并人工合成该水样; 测定了40~80 ℃、8~12 MPa条件下CO₂在该水样中的溶解度, 其结果可为评价鄂尔多斯盆地深部咸水含水层埋存能力提供依据.
- 地质储存 /
- 鄂尔多斯盆地 /
- 溶解能力 /
- 地下水 /
- 水文地质学
Abstract: Geological storage is one of the most effective means to reduce the anthropogenic greenhouse gas emissions to mitigate the worsening global warming. Depleted oil-gas reservoirs, coal seams and deep saline aquifers are potential sites for CO₂ geological storage of which saline aquifer has the greatest potential for sequestration. Among the many effective mechanisms, dissolving storage is characterized by large storage capacity, long action time and high safety. When evaluating the storage capacity of a deep saline aquifer, CO₂ solubility becomes a key parameter. In this paper, an experimental method is proposed and used to measure the CO₂ solubility in Shanxi Formation water. Ordos Basin is an important energy base for China which releases a lot of high concentration CO₂. Studies show CO₂ geological storage is possible in Ordos Basin since its Shanxi Formation forms many source-reservoir-cap assemblages, and it is of great importance both in theory and practice to probe into CO₂ solubility in Shanxi Formation water of Ordos Basin. In this paper, chemical composition of Shanxi Formation water collected from the Ordos Basin were analyzed. CO₂ solubilities in the artificial synthetic Shanxi Formation waterwere measured at 40-80℃, 8-12 MPa pressure. The results can be used for the evaluation of the CO₂ storage capacity in deep saline aquifer of Ordos Basin.
- geological storage /
- Ordos basin /
- solubility /
- groundwater /
- hydrogeology

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图 1 1970—2004年期间全球人为温室气体排放量

Fig. 1. Global anthropogenic greenhouse gas emissions during 1970 to 2004

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图 2 实验装置

Fig. 2. Schematic diagram of the apparatus

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图 3 样品采集位置

Fig. 3. Sample collecting position

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图 4 CO₂在实验水样(a)和纯水(b)中的溶解度随压力的变化

Fig. 4. CO₂ solubility in experimental water (a) and pure water (b) at different pressures

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图 5 CO₂在实验水样中的溶解度随温度的变化

Fig. 5. CO₂ solubility in experimental water at different pressures

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图 6 在10MPa(a)、40℃(b)条件下CO₂在纯水与实验水样中溶解度的比较

Fig. 6. Comparison of CO₂ solubility in pure water and experimental water at 10MPa (a) and 40℃(b)

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表 1 鄂尔多斯盆地山西组地下水化学成分

Table 1. Chemical composition of Shanxi Formation groundwater in Ordos basin

项目	ρ_B(mg·L^-1)	C_B(mmol·L^-1)
pH	6.90
K⁺	67.80	1.734
Na⁺	2405.00	104.565
Ca²⁺	888.50	22.168
Mg²⁺	32.79	1.349
NH₄⁺	＜0.01	＜0.001
Al³⁺	＜0.02	—
Cl^-	5151.49	145.317
SO₄^2-	29.10	0.303
HCO₃^-	642.01	10.521

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表 2 人工合成鄂尔多斯盆地山西组地下水实际用量

Table 2. Recipe for synthetic Shanxi Formation groundwater in Ordos basin

试剂	级别	质量(g)
NaCl	分析纯	5.5016
KCl	分析纯	0.1267
CaCl₂	分析纯	2.4598
MgCl₂	分析纯	0.1283
NaHCO₃	分析纯	0.8838

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表 3 人工合成山西组水样CO₂溶解度数据

Table 3. Solubility of CO₂ in synthetic Shanxi Formation water

p(MPa)	t(℃)	CO₂溶解度(g/100g水样)
8	40	4.1325
8	50	3.7660
8	60	3.4672
8	70	2.8024
8	80	2.9234
9	40	4.4582
9	50	3.8240
9	60	3.6137
9	70	3.2732
9	80	3.1099
10	40	4.9088
10	50	3.8848
10	60	3.8328
10	70	3.6542
10	80	3.4597
11	40	5.1454
11	50	4.0946
11	60	3.9191
11	70	3.6859
11	80	3.3427
12	40	5.0948
12	50	4.3054
12	60	4.0520
12	70	3.6379
12	80	3.4382

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