高温环境下气藏型储气库泥岩盖层密封性评价  

Evaluation on sealing performance of mudstone caprocks of gas reservoir-type gas storage in high temperature environment

作　　者：骆正山[1] 段远哲 王小完[1] 张新生[1] LUO Zhengshan;DUAN Yuanzhe;WANG Xiaowan;ZHANG Xinsheng(School of Management,Xi'an University of Architecture and Technology,Xi'an Shaanxi 710055,China)

机构地区：[1]西安建筑科技大学管理学院,陕西西安710055

出　　处：《中国安全科学学报》2022年第2期74-82,共9页China Safety Science Journal

基　　金：国家自然科学基金资助(41877527);陕西省社科基金资助(2018S34)。

摘　　要：为探究高温作用对泥岩盖层密封性的影响,从理论上剖析储气库盖层产生热应力的3种形式,在室内试验的基础上,分析泥岩在高温环境下力学损伤程度和盖层物性封闭评价指标随温度变化特征。结果表明:高温环境下泥岩整体结构性能降低,400℃左右是泥岩在周期热应力作用下损伤的阈值温度;高温作用会显著改变泥岩盖层物性封闭特征,400℃左右是泥岩丧失物性封闭能力的阈值温度。对某气藏型储气库盖层的实证研究和分析结果显示,目标盖层温度区间尚未超过阈值温度,认为泥岩盖层具有良好的封闭性能;评价结果能够反映泥岩盖封的真实情况。In order to explore influence of high temperature on sealing performance of mudstone caprocks,three forms of thermal stress generated by gas storage caprocks were theoretically analyzed.Then,based on laboratory tests,mechanical damage degree of mudstone and changes of caprock sealing assessment indicators in high temperature environment were analyzed.The results show that the overall structural performance of mudstone is reduced under high temperature,with 400℃being generally the threshold temperature for its damage under action of periodic thermal stress.High temperature will significantly change the physical sealing characteristics of mudstone caprocks,and when it is around 400℃,which is the threshold,sealing ability will be lost.According to empirical research and analysis results of caprocks in a gas reservoir type gas storage,temperature range of target caprock has not exceeded the threshold.It is believed that the mudstone caprock has good sealing performance,and evaluation result can reflect the true situation of mudstone capping.

关 键 词：气藏型储气库 泥岩 盖层密封性 高温作用 热应力 物性封闭 

分 类 号：X913.4[环境科学与工程—安全科学]