特种油气藏2024，Vol.31Issue(6)：39-48,10.DOI:10.3969/j.issn.1006-6535.2024.06.005
南堡凹陷林雀次洼沙一段页岩不同尺度孔喉分形特征及其主控因素
Fractal Characteristics of Shale Pore Throats at Various Scales and Their Dominant Controlling Factors in the First Member of the Shahejie Formation in the Linque Sub-sag of the Nanpu Depression
摘要
Abstract
This study aims to address the insufficient analysis and evaluation of the pore-throat structure in the shale reservoir of the first member of the Paleogene Shahejie Formation in Nanpu Depression.To achieve this,we utilized scanning electron microscopy(SEM),constant-rate mercury injection experiments,and fractal theory to evaluate the fractal dimension of pore-throats at different scales.The findings indicate that the pore throats in shale can be clas-sified into two distinct types:large-scale and small-scale.Furthermore,the fractal dimensions of the pore throats va-ry significantly across different scales.The small-scale pore throats exhibit strong compaction and cementation,pri-marily consisting of intercrystalline pores,intragranular pores,and tubular throats.The degree of heterogeneity is low,and the deformation of pore throat space is minimal,resulting in a smaller fractal dimension.The predominant types of large-scale pore throats in shale reservoirs are intergranular pores,pore-shrinking throats,and curved throats.These pore throats exhibit significant reservoir space and deformation phenomena.The pore structure in shale reservoirs is highly heterogeneous,with a large fractal dimension.The presence of various types and sizes of pore throats in shale reservoirs results in distinct heterogeneity characteristics in the pore structure.The fractal di-mension is an effective measure of the complexity of the reservoir pore structure.The research findings offer a crucial scientific foundation for the exploration and development of shale oil reservoirs,which is beneficial in enhancing the efficiency of shale oil development and holds significant importance for the later development of oil fields.关键词
南堡凹陷/林雀次洼/沙河街组/孔喉结构/分形维数/恒速压汞/页岩Key words
Nanpu Depression/Linque Sub-sag/Shahejie Formation/pore throat structure/fractal dimension/con-stant rate mercury penetration/shale分类
能源科技引用本文复制引用
高永亮,李国永,刘小平,马乾,孟令箭,王建伟,魏亚琼,庄东志..南堡凹陷林雀次洼沙一段页岩不同尺度孔喉分形特征及其主控因素[J].特种油气藏,2024,31(6):39-48,10.基金项目
中国石油科技项目"渤海湾及外围盆地风险勘探领域和目标研究、工程技术攻关及现场试验"(2023YQX10103)、"冀东油田探区'十四五'油气资源评价"(2023YQX20107) （2023YQX10103）
