不同溶液渗透溶蚀作用下碳酸盐岩渗透特性研究

doi:10.13722/j.cnki.jrme.2018.0520

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摘要为了研究不同溶液渗透溶蚀作用下碳酸盐岩渗流特性演化规律，选择Na2SO4溶液和蒸馏水作为渗透流体，使用岩石高压耦合渗透实验装置，对碳酸盐岩试样分别进行长达15 d的渗透溶蚀实验研究，得到对应工况下的渗透率和渗出液中矿物离子浓度随时间变化曲线，分析实验中各种影响因素与渗透率、矿物质溶解变化规律之间的有机联系。结果表明：实验初期岩样渗透率的较大改变是由应力条件引起的，应力的影响随实验的进行逐渐减小。当围压和渗压等量增大时，渗透率受围压的影响较大，而由于应力的变化较小，渗透率变化趋势所受的影响较小。在稳定阶段，岩石渗透率变化则是渗透溶液的溶蚀作用和矿物沉淀共同作用的结果。Na2SO4溶液的溶解作用相对较强，CaCO3在岩样上游段产生较强的溶解，当溶解的Ca2+浓度达到最高后，在下游段产生CaCO3沉淀，造成溶解过程中的不均匀性，最终表现为渗透率降低；蒸馏水溶液对碳酸盐岩的溶解能力较弱，在上游段溶解少量Ca2+，下游段的溶解速率变低，并且沿程难以使Ca2+达到过饱和状态，不易产生沉淀，最终渗透率保持稳定。

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	盛金昌1
	吴彦青1
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	白柯含1
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	杜昀宸1
	张肖肖1
	周庆1
	李柯雅1

关键词 ：岩石力学, 碳酸盐岩, 渗流特性, 渗透实验, 溶蚀

Abstract：For the research of the permeability evolution of carbonate rocks under seepage corrosion effect of different solutions，Na2SO4 solution and distilled water were used to conduct rock permeation experiment for 15 d using the hydraulic-mechanical coupling permeability experimental system. The curves of carbonate permeability versus time and the variation of mineral ion concentration in leachate with time corresponding to the design conditions were obtained. The relationship between the law of permeability change，the law of mineral dissolution and various influencing factors was analyzed. The results indicate that the significant changes in the permeability of carbonate rocks in early stage are caused by stress conditions. With the development of experiment，the effect of stress decreases gradually. When the confining pressure and osmotic pressure increase equally，permeability is greatly influenced by confining pressure. The trend of permeability is less affected by minor changes of stress. In the stable stage，the change of rock permeability is the result of the joint action of the corrosion and mineral precipitation of the osmotic solution. The dissolution of Na2SO4 solution is relatively strong，CaCO3 dissolves strongly in the upstream of rock sample. After the concentration of Ca2+ reaches the maximum，the CaCO3 precipitates in the downstream，resulting in the heterogeneity of dissolution process，and finally the permeability decreased. The dissolution of distilled water to carbonate minerals is weak，a small amount of Ca2+ dissolves in the upstream and the dissolution rate of the downstream became lower. The Ca2+ concentration can't reach the supersaturated state along the path，that makes it difficult to precipitate，and the final permeability maintains stability.

Key words： rock mechanics carbonate rocks permeability permeation experiment corrosion

引用本文:

盛金昌1，吴彦青1，2，白柯含1，2，杜昀宸1，张肖肖1，周庆1，李柯雅1. 不同溶液渗透溶蚀作用下碳酸盐岩渗透特性研究[J]. 岩石力学与工程学报, 2019, 38(S2): 3279-3286.
SHENG Jinchang1，WU Yanqing1，2，BAI Kehan1，2，DU Yunchen1，ZHANG Xiaoxiao1，ZHOU Qing1，LI Keya1. Study on the permeability evolution of carbonate rocks under seepage corrosion effect of different solutions. , 2019, 38(S2): 3279-3286.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.0520 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS2/3279

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