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OALib Journal期刊
ISSN: 2333-9721
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微观孔隙结构对页岩应力敏感影响的实验研究
Keywords: 页岩,应力敏感,孔隙结构,毛管模型
Abstract:
？研究页岩储层在开发过程中的应力敏感对产能评价具有重要意义。通过脉冲法测量了渝南下寒武统牛蹄塘组2块页岩岩心的应力敏感曲线，应用毛管理论推导了毛管半径随有效应力变化的关系式，结合扫描电镜图像分析了孔径变化对应力敏感的响应特征。最后采用低温液氮吸附实验研究了页岩的微观孔隙结构特征，同时对毛管半径应力敏感公式进行了验证。研究结果表明：该地区2块页岩岩样均体现出强应力敏感，其渗透率随有效应力的变化符合指数关系式；毛管半径随有效应力的变化同样符合指数关系，孔隙越容易被压缩，毛管半径保留率越低，应力敏感越强；低温液氮吸附实验结果验证了毛管半径应力敏感公式的有效性，表明了在mk64-2岩样中，大孔比例较少，压缩过程中平均毛管半径保留率更低，小孔的比例较高，其压缩后提供给大孔的渗流通道较少，因此该岩样应力敏感性更强。？
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