盐穴储气库泥岩夹层渗透性测试新方法

发布时间：2018-01-09 10:32

本文关键词：盐穴储气库泥岩夹层渗透性测试新方法　出处：《岩土力学》2017年08期 　论文类型：期刊论文

【摘要】：金坛盐穴储气库现场压井试验发现某泥岩夹层密封性欠佳,可能影响储气库运行的密闭性,钻井取芯情况表明,该夹层易破碎,难以开展系统的渗透性测试试验。针对该问题,提出了一种测试易碎泥岩夹层渗透率的新方法,将泥岩夹层岩芯浇筑在环氧树脂中,通过切割打磨等工序制备出符合渗透试验要求的标准试样。为了观测泥岩夹层岩芯与环氧树脂的胶结情况,对人工合成试样进行了镀金电镜扫描试验,发现交界面孔隙较岩石孔隙小、胶结良好,说明夹层岩芯是人工合成试样中的主要渗透通道。利用稳态法对人工合成试样进行渗透率测试,测试结果与其他学者的测试结果吻合,证实了该方法的可靠性。同时开展了理论分析,结果表明,浇筑式方法测得的渗透率与理论结果相符,从理论上进一步证实了其可行性。文中所述的泥岩夹层渗透性测试方法,对测试不规则破碎岩芯的渗透率具有一定参考意义。
[Abstract]:Field test of Jintan Salt cavern gas storage shows that the sealing of a mudstone interlayer is not good, which may affect the sealing of gas storage. The drilling core-taking shows that the interlayer is easily broken. It is difficult to carry out systematic permeability test. In order to solve this problem, a new method of testing permeability of fragile mudstone intercalation is proposed, in which mudstone intercalation core is poured into epoxy resin. In order to observe the cementation of mudstone interlayer core and epoxy resin, the gold-plated electron microscope scanning test was carried out. It is found that the interfacial pore is smaller than the rock pore and the cementation is good, which indicates that the interlayer core is the main permeable channel in the artificial synthetic sample. The permeability of the artificial synthetic sample is measured by the steady-state method. The experimental results are in agreement with those of other scholars, and the reliability of the method is confirmed. At the same time, the theoretical analysis is carried out, and the results show that the permeability measured by the pouring method is in agreement with the theoretical results. It is proved theoretically that the permeability of mudstone intercalation is tested in this paper, which has a certain reference significance for testing the permeability of irregular broken core.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;中国科学院大学;
【基金】：国家自然科学基金资助项目(No.41472285,No.51404241,No.41602328)~~
【分类号】：TE82
【正文快照】： 盐岩具有良好的密封性、低渗透性和损伤自愈合的特性,被公认为是能源储存、高放射核废料永久处置的理想介质[1]。盐矿开采后形成的地下空间,能够为不溶解于盐的物质(石油、天然气或高放射性物质)提供储存和处置场所[2]。近50年来,欧美等地区对盐岩地下能源储存开展大量研究,相

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