裂隙水岩反应特征与雷诺数对溶解速率的影响

doi:10.12068/j.issn.1005-3026.2020.08.018

东北大学学报:自然科学版 ›› 2020, Vol. 41 ›› Issue (8): 1174-1179.DOI: 10.12068/j.issn.1005-3026.2020.08.018

裂隙水岩反应特征与雷诺数对溶解速率的影响

王者超，卫如雷，毕竞超，毋振华

(东北大学深部金属矿山安全开采教育部重点实验室，辽宁沈阳110819)

收稿日期:2019-06-26 修回日期:2019-06-26 出版日期:2020-08-15 发布日期:2020-08-28
通讯作者: 王者超
作者简介:王者超(1980-)，男，山东高唐人，东北大学教授.
基金资助:
国家自然科学基金资助项目(51779045，51579741)；辽宁省“兴辽英才计划”项目(XLYC1807029)；中央高校基本科研业务费专项资金资助项目(N182410001，N180104022)；国家级大学生创新创业训练计划项目(201810145059).

Characteristics of Water-Rock Reaction and Effect of Reynolds Number on Dissolution Rate for Fractures

WANG Zhe-chao， WEI Ru-lei， BI Jing-chao， WU Zhen-hua

Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines， Northeastern University， Shenyang 110819， China.

Received:2019-06-26 Revised:2019-06-26 Online:2020-08-15 Published:2020-08-28
Contact: WANG Zhe-chao
About author:-
Supported by:
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摘要/Abstract

摘要： 以中国首个地下大型水封油库——黄岛油库为依托，在不同雷诺数条件下进行花岗岩单裂隙水岩相互作用试验，分析花岗岩单裂隙水岩反应特征和雷诺数对花岗岩表面可溶矿物溶解速率的影响.研究结果表明，在酸性条件下花岗岩发生化学反应的主要矿物为榍石；水岩之间发生的最主要化学反应为CaTiSiO₅+4H⁺→TiO²⁺+H₄SiO₄+Ca²⁺，H₂O+CO₂HCO^-₃+H⁺和TiO²⁺+2H₂O→H₂TiO₃↓+2H⁺；0~10d内水岩化学反应最强烈，随后逐渐降低，直至达到平衡；流体流动能显著提升榍石的溶解速率，相比Re=2500工况，Re=500工况下流体流动对榍石溶解速率的影响更大，这是由于较高的流速降低了溶质运移速率，使得宏观化学反应速率降低.

关键词: 花岗岩, 单裂隙, 水岩化学反应, 雷诺数, 溶解速率

Abstract: Based on the first large-scale underground water-sealed oil storage facility in China， viz Huangdao underground oil storage facility， the experiments of water-rock interaction in single fractures of granite at different flow rates were performed. The characteristics of water-rock reaction were observed and the effects of Reynolds number on the dissolution rate of soluble minerals on the surface of granite were analyzed. The results show that the main mineral of the chemical reactions of granite in acidic conditions is sphene. The dominant chemical reaction between water and rock are CaTiSiO₅+4H⁺→TiO²⁺+H₄SiO₄+Ca²⁺， H₂O+CO₂HCO^-₃+H⁺ and TiO⁺₂+2H₂O→H₂TiO₃↓+2H⁺. The chemical reaction rate is the highest in the first 10 days， then gradually decreases until equilibrium states are reached. Fluid flow can significantly increase the dissolution rate of sphene， however， the reaction rate in the experiment with Reynolds number of 500 is higher than that with Reynolds number of 2500， due to higher flow rate reducing the transport rate of solute， making the macro chemical reaction rate lower.

Key words: granite, single fracture, water-rock chemical reactions, Reynolds number, dissolution rate

中图分类号:

P641

王者超，卫如雷，毕竞超，毋振华. 裂隙水岩反应特征与雷诺数对溶解速率的影响[J]. 东北大学学报:自然科学版, 2020, 41(8): 1174-1179.

WANG Zhe-chao， WEI Ru-lei， BI Jing-chao， WU Zhen-hua. Characteristics of Water-Rock Reaction and Effect of Reynolds Number on Dissolution Rate for Fractures[J]. Journal of Northeastern University Natural Science, 2020, 41(8): 1174-1179.

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裂隙水岩反应特征与雷诺数对溶解速率的影响

Characteristics of Water-Rock Reaction and Effect of Reynolds Number on Dissolution Rate for Fractures

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