现代地质2026，Vol.40Issue(4)：1180-1196,17.DOI:10.19657/j.geoscience.1000-8527.202508240027
南堡凹陷古近系沙河街组一段湖相块状与纹层状页岩储层微观特征差异性研究
Reservoir micro-characteristics of massive and laminated lacustrine shales:A comparative study from the Paleogene Shahejie Formation,Nanpu Sag
摘要
Abstract
To investigate the micro-characteristics of laminated lacustrine shale,samples were collected from the first member of the Paleogene Shahejie Formation in the Nanpu Sag.An integrated approach was applied,including nitrogen adsorption,X-ray diffraction,TOC measurement,rock-eval pyrolysis,scanning electron microscopy,and image analysis using ImageJ software.The results show that the shale interval comprises both massive and laminated types,with the latter being dominated by clay,mixed,and felsic laminae.Compared to massive shale,laminated shale exhibits more developed micro-fractures,better pore connectivity,and a higher occurrence of organic matter-filled pores.In contrast,pores in massive shale are smaller and less connected,with organic matter intermittently filling only part of the intergranular pores.Geochemical analysis indicates that laminated shale has higher average TOC(1.06%)and S1 values(1.76 mg/g)than massive shale(TOC:0.60%;S1:0.68 mg/g),confirming its superior oil-bearing potential.The reservoir is dominated by medium-sized pores.While laminated shale has a larger specific surface area and average pore diameter than massive shale,its porosity is relatively lower.Furthermore,as lamina density increases,the porosity of laminated shale increases but TOC content decreases;whereas,with greater variation in grain lamina thickness,porosity decreases and TOC content increases.The laminated mixed shale is a favorable lithofacies for shale oil explora-tion due to its complex pore network,good connectivity and high organic matter abundance.关键词
湖相页岩/纹层/孔隙结构/古近系/南堡凹陷/渤海湾盆地Key words
lacustrine shale/laminae/pore structure/Paleogene/Nanpu Sag/Bohai Bay Basin分类
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彭闻迪,刘小平,孙彪,刘国勇,王建伟,高永亮,袁瑜..南堡凹陷古近系沙河街组一段湖相块状与纹层状页岩储层微观特征差异性研究[J].现代地质,2026,40(4):1180-1196,17.基金项目
国家自然科学基金项目(42072150). （42072150）
