油气地质与采收率2026，Vol.33Issue(3)：102-112,11.DOI:10.13673/j.pgre.202504006
纹层型页岩储层微观孔隙结构对层间窜流的影响规律
Influence of microscopic pore structures on crossflow in laminated shale reservoirs
摘要
Abstract
Laminated structures are extensively present in China's continental shale reservoirs.As a key characteristic for laminated structures,the crossflow between lamellae plays a crucial role in promoting the mobilization of fluids in low-permeability layers.Different types of lamellae display variations in mineral composition and pore structure,which significantly influence the flow both within and between the lamellae.However,due to limitations in research scale,conventional experimental and simulation methods have difficulty in precisely characterizing the pore structure and crossflow features of lamellae.In this study,pore network modeling was employed to construct lamella models with different microstructural parameters,and the elastic depletion flow process of shale oil was simulated.The impact of pore-throat size and pore connectivity in clay and felsic lamellae on crossflow was investigated.The results demonstrate that compared to dispersed and clustered structures,laminated structures exhibit higher fluid production efficiency.The crossflow from clay lamellae with poorer petrophysical properties to felsic lamellae with better properties significantly enhances the mobilization of oil within the clay lamellae.As the pore-throat diameter of the clay and felsic lamellae increases,or pore connectivity improves,the depletion of pore pressure accelerates,and the crossflow rate becomes higher.The proportion of crossflow production volume to the total production volume of clay lamellae is mainly determined by the interlayer permeability ratio.When the interlayer permeability ratio ranges from 100 to 2 000,the proportion of interlayer flow volume is between 80%and 93%.关键词
页岩油/纹层/层间窜流/孔隙网络模型/弹性衰竭流动Key words
shale oil/lamella/crossflow/pore network model/elastic depletion flow分类
能源科技引用本文复制引用
王珂,孙海,牛小兵,周新平,付金华,董明哲..纹层型页岩储层微观孔隙结构对层间窜流的影响规律[J].油气地质与采收率,2026,33(3):102-112,11.基金项目
国家自然科学基金项目"陆相页岩油流动机理与有效开发方式"(42090024),国家自然科学基金企业创新发展联合基金项目"三大盆地深层-超深层海相油气高效勘探开发基础研究"(U24B6001),国家自然科学基金优秀青年科学基金项目"多尺度油气渗流力学"(52122402),山东省自然科学基金杰出青年科学基金项目"非常规油气藏多尺度渗流理论"(ZR2022JQ23),长庆油田分公司关键核心技术攻关项目"鄂尔多斯盆地延长组长73纹层型页岩油富集理论与开发技术研究"(KJZX2023-02). （42090024）
