| 察尔汗盐湖固体钾盐溶解对溶剂注入速率响应机制研究 |
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| 关键词:Qarhan Salt Lake halogen reservoir sylvite mineral permeability coefficient injection rate |
| 基金项目:中国科学院重点部署项目(编号: ZDRW-ZS-2020-3);国家自然科学基金项目(编号: 41807216);青海省科技厅项目(编号: 2020-ZJ-765) |
| 作者 | 单位 | E-mail | | 常政 | 中国科学院青海盐湖研究所, 中国科学院盐湖资源综合高效利用重点实验室,青海省盐湖地质与环境重点实验室
中国科学院大学 | changercz@163.com | | 袁小龙 | 中国科学院青海盐湖研究所, 中国科学院盐湖资源综合高效利用重点实验室,青海省盐湖地质与环境重点实验室
河海大学水利水电学院 | | | 刘万平 | 青海盐湖工业股份有限公司 | | | 李梦玲 | 中国科学院青海盐湖研究所, 中国科学院盐湖资源综合高效利用重点实验室,青海省盐湖地质与环境重点实验室
中国科学院大学 | | | 苗卫良 | 中国科学院青海盐湖研究所, 中国科学院盐湖资源综合高效利用重点实验室,青海省盐湖地质与环境重点实验室
中国科学院大学 | | | 程怀德 | 中国科学院青海盐湖研究所, 中国科学院盐湖资源综合高效利用重点实验室,青海省盐湖地质与环境重点实验室
中国科学院大学 | | | 卜迪 | 青海盐湖镁业有限公司 | | | 张昊 | 青海盐湖镁业有限公司 | | | 张西营 | 中国科学院青海盐湖研究所, 中国科学院盐湖资源综合高效利用重点实验室,青海省盐湖地质与环境重点实验室
中国科学院大学 | xyzchina@isl.ac.cn |
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| A Study on the Mechanism of Influence of the Dissolution of Solid Potassium Salt in Qarhan Salt Lake to the Rate of Solvent Injection |
| The shallow brine reservoir of Qarhan Salt Lake contains considerable reserves of solid potash resources, and it is currently at the stage of liquefaction mining. The dissolution of solid potassium salt minerals in the brine reservoir and the structural changes of the brine reservoir are controlled by the solvent injection rate, however, the control mechanism is still unclear. In this paper, a typical borehole core in the shallow brine reservoir of Qarhan Salt Lake was investigated. Through the indoor core column seepage simulation experiment, the permeability coefficient of the brine reservoir and the dissolution of solid potash minerals under three flow rates are studied. The results show that: (1) With the increase of the solvent injection rate, the core permeability coefficient shows a gradually increasing trend, and the potassium ion concentration in the exudate shows a continuous decreasing trend, but at the time node when the flow velocity changes, the rock core both the core permeability coefficient and the potassium ion concentration in the corresponding dissolution liquid showed an abnormal increase. The dissolution of minerals causes the porosity of the reservoir to increase, and the change of the solvent flow rate causes the reorganization of loose salt mineral particles. (2) The dissolution of solid potash minerals in the brine core was significantly affected by the solvent injection rate. The increase in injection rate causes the reorganization of mineral particles and the release of high-concentration water from the retained pores, which were the main reasons for the temporary increase of K+ concentration in the exudate. This experimental study has certain theoretical guiding significance for the water-soluble mining of low-grade solid potassium salt in the study area. |
| CHANG Zheng,YUAN Xiao-long,LIU Wan-ping,LI Meng-ling,MIAO Wei-liang,CHENG Huai-de,BU Di,ZHANG Hao,ZHANG Xi-ying.2022.A Study on the Mechanism of Influence of the Dissolution of Solid Potassium Salt in Qarhan Salt Lake to the Rate of Solvent Injection[J].Acta Geoscientica Sinica,43(3):287-294. |
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