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中-细粒长石石英砂岩低渗储层在围压循环增减条件下渗透率变化规律的试验研究 被引量:2

Experimental study on the variation of permeability of medium-fine feldspar-quartz sandstone low-permeability reservoir under the circulatory increasing or reducing conditions of confining pressure
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摘要 二氧化碳(CO_2)地质储存灌注过程大都具有间断性、多期次注入的特点。多期次注入造成储层应力反复积累和消散,储层水平方向的有效应力也将呈现反复加载和卸载效应。通过实验,分析了两个岩石学特征相似的岩心样品在围压循环加、卸载并考虑注入间断期应力消散条件下岩石的渗透率变化规律。试验结果表明,在多次围压加、卸载刺激下渗透率显著下降,降幅可达到20%~40%;间断期应力消散对渗透率的影响很大,实际的注入工程数值模拟计算中应给予充分重视;渗透率变幅在高围压区小,在低围压区域大;根据实验数据构建了黏土矿物含量在10%左右的中-细粒长石石英砂岩低渗储层在多期次围压加、卸载过程的渗透率量化方程,为CO_2地质储存工程多期次注入同类型储层储存潜力评价和CO_2储层监测数据解释提供了理论依据, Long-term CO2 geological storages are mostly injected in a process with the characteristics of dis-continuity in multiple injection stages. Intermittent injections cause reservoir stress to accumulate and dissi-pate repeatedly, and horizontal effective stress in the reservoir also appears repeated loading and unloadingeffect. Through experiment,the permeability of two rock samples with similar petrological features were ana-lyzed under the circulatory loading and unloading conditions of confining pressure,and in consideration ofstress dissipation during injection gap period. The experimental results show that the permeability are de-clined significantly with the declines ranging in 20% ~ 40%,under the repeated loading and unloading con-dition of confining pressure. The change of permeability is smaller in high confining pressure area, whilebigger in low confining pressure area. The stress dissipation in injection gap period has much effect on therock permeability, and full attention should be given to the numerical simulation of actual injection engi-neering. Based on the experimental data,the permeability quantitative equations in different loading and un-loading stage of confining pressure have been built for the medium-fine-grained feldspar-quartz sand-stone with about 10% clay mineral content. The result is helpful to evaluate the potential of reservoir stor-age and to interpret the monitoring data of CO_2 geological storage project with multi-period injection.
作者 王福刚 孙兆军 刘红艳 许天福 靖晶 WANG Fugang1, SUN Zhaojun1, LIU Hongyan2, XU Tianfu1, JING Jing1 ( 1. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changehun 130021, China; 2. The Test Experiment Center of Jilin University, Changchun 130021, China)
出处 《水利学报》 EI CSCD 北大核心 2016年第9期1125-1132,共8页 Journal of Hydraulic Engineering
基金 国家自然科学基金项目(41172205) 中国地调局工作项目(12120113006300)
关键词 渗透率 储层 砂岩 围压 循环荷载 permeability reservoir sandstone confining pressure cyclic loading and unloading
作者简介 王福刚(1975-),男,教授,主要从事非常规环境地下水渗流与溶质迁移实验与模拟研究。E-mail:549032387@qq.com
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