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OALib Journal期刊
ISSN: 2333-9721
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基于可视缝宽测量的储层应力敏感性评价新方法
Keywords: 应力敏感性,致密碳酸盐岩,裂缝宽度,特征值,可视化
Abstract:
？储层应力敏感性在储层保护、产能预测、油气田开发方案制定等方面有着重要的研究意义。利用加载岩石微观图像分析装置，研究了致密碳酸盐岩在不同围压下的裂缝宽度和渗透率分布特征及变化规律，结合常规的储层应力敏感性评价实验，探讨了储层应力敏感性的裂缝宽度特征值。研究表明:①裂缝压缩过程具有自相似性，裂缝宽度在围压(0~20mpa)增加后仍呈正态分布；②窄裂缝比宽裂缝对围压变化更敏感，但宽裂缝绝对变化量大；③宽裂缝宽度控制并反映了致密岩石渗透率的整体变化特征，岩样90%的渗透率由仅占10%的宽裂缝所决定；④裂缝宽度累积分布曲线上纵坐标为90%所对应的缝宽，可以用来评价裂缝性致密储层的应力敏感性，同常规应力敏感性评价结果较为一致。
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