杨宝刚;潘仁芳;赵丹;李卓文;高博乐;

• 1:长江大学油气资源与勘查技术教育部重点实验室

摘要(Abstract)：

页岩的岩石力学特性对页岩气开发效果具有重要影响,因此以四川盆地长宁示范区志留系龙马溪组泥页岩层段为研究对象,分析其力学与脆性特性。采用矿物组分分析、地球物理测井分析和实验室力学实测相结合的方法,比较了龙马溪组龙一段和龙二段的脆性矿物含量、泊松比、杨氏模量、岩石脆性、三轴压力等力学特性。结果表明:龙二段比龙一段具有更高的脆性矿物含量,龙一段的泊松比明显高于龙二段,利用纵横波时差比可以反映泊松比的变化,纵横波时差关系图的斜率与泊松比具有相反的变化趋势。龙一段样品的杨氏模量低于龙二段样品,通过杨氏模量和泊松比关系图发现龙一段与龙二段发生分离,龙二段页岩段的脆性指数大于0.5,应力、应变曲线的负坡较陡。综合评价分析表明:龙二段具有较低的泊松比、纵横波时差比和较高的杨氏模量,龙一段比龙二段更易变形。因此龙二段脆性优于龙一段脆性,有利于后期的压裂改造。

关键词(KeyWords)： 长宁示范区;龙马溪组;矿物组分分析;泊松比;杨氏模量;岩石脆性;三轴压力

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41472123)

作者(Author): 杨宝刚;潘仁芳;赵丹;李卓文;高博乐;

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DOI:

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