岩矿测试2026，Vol.45Issue(1)：61-72,12.DOI:10.15898/j.ykcs.202411050229
基于X射线衍射技术研究页岩中非晶质组分与力学性质的关系
Relationship between Amorphous Components and Mechanical Properties in Shale Using X-ray Diffraction:A Case Study from the Permian Wujiaping Formation Shale Reservoir,Sichuan Basin
摘要
Abstract
The relationship between the composition of various amorphous components in shale reservoirs and their mechanical properties is crucial for enhancing the understanding of shale brittleness and clarifying the factors that influence the fracturing reconstruction of shale reservoirs.The presence of diverse types and varying quantities of amorphous components in shale reservoirs introduces uncertainty in the determination of rock mechanics weight coefficients when employing X-ray diffraction analysis.This uncertainty subsequently impacts the quantitative assessment of shale brittleness.This study focuses on representative shale samples from Well DY1H(eastern Sichuan Basin).X-ray diffraction technology serves as the primary analytical method,supplemented by experimental techniques such as thin section,scanning electron microscopy,and carbon-sulfur analysis.These methods were employed to quantitatively investigate the relationship between the content of different amorphous components and their mechanical properties through an enhanced calculation method for rock mechanics weight coefficients.The results reveal that the shale from the Permian Wujiaping Formation at Well DY1H possesses a significant proportion of amorphous components,with an average total mass fraction of 47.60%,and a notable predominance of inorganic components,averaging 37.04%.Furthermore,the inorganic and organic components within the amorphous fractions demonstrate both positive and negative correlations with rock brittleness,suggesting that the amorphous inorganic components confer brittle characteristics while the organic components exhibit plastic characteristics.Variations in the content of amorphous organic components within shale reservoirs can influence the precision of brittleness index calculations derived from mineral composition methods.Specifically,when organic carbon content is low,the mineral composition method can be effectively utilized to assess shale brittleness,except for tuff formations.Additionally,the content of amorphous inorganic components in shale shows a positive correlation with the presence of illite-montmorillonite mixed layers within clay minerals,indicating that these interlayer clay minerals are products of the transformation of amorphous inorganic components during diagenesis.In scenarios where a high abundance of amorphous inorganic components is present in shale,it is crucial to consider the role of interlayer clay minerals,which can improve the plasticity of the shale.关键词
X射线衍射/非晶质组分/岩石力学权重系数/压裂改造Key words
X-ray diffraction/amorphous component/rock mechanics weight coefficient/fracturing reconstruction分类
天文与地球科学引用本文复制引用
谭杰,冯明友,王丽,陈洪斌,严玉霞,邹春艳,施雨华..基于X射线衍射技术研究页岩中非晶质组分与力学性质的关系[J].岩矿测试,2026,45(1):61-72,12.基金项目
国家科技重大专项项目"四川盆地二叠系—中三叠统天然气富集规律与目标评价"(2016ZX05007-004) （2016ZX05007-004）
国家自然科学基金青年基金项目(41202109) （41202109）
中国石油西南油气田公司科技项目"四川盆地川西地区二叠系火成岩矿物组分判识方法及岩电关系研究"(20200301-02) （20200301-02）
