中国石油大学学报（自然科学版）2025，Vol.49Issue(2)：68-81,14.DOI:10.3969/j.issn.1673-5005.2025.02.006
东营凹陷牛庄洼陷古近系不同纹层组合富碳酸盐页岩的微观储渗能力
Microscopic storage and seepage capacities in laminated carbonaceous shale of Paleogene in Niuzhuang Sub-Sag,Dongying Sag
摘要
Abstract
The Paleogene laminated calcareous shale in the Dongying Depression contains abundant shale oil resources.How-ever,its complex lithology,characterized by intricate textures and diverse mineral compositions,results in strong heterogene-ities in storage and seepage capacities,making it challenging to identify the"sweet spots"for shale oil extraction.In this study,we analyze lamina features and their combinations through integrated microscopic observations and geochemical meas-urements of laminated carbonaceous shales from the Esx3-Ess4 formations in the Dongying depression,Bohai Bay Basin.Fur-thermore,we employ combined pore structure characterization techniques to investigate the microstructures of pores and frac-tures in shales with different lamina combinations.The results reveal three types of lamina combinations,of which Type I is a binary combination of parallelly thick carbonate lamina and thin clay mineral lamina,Type II is a binary combination of parallelly carbonate lamina and felsic clay lamina with uniform thickness,and Type Ⅲ is a combination of discontinuous car-bonate lamina and felsic clay lamina with uniform thickness.In Type I laminated shale,intergranular pores,dissolution pores,and microcracks are well-developed,with macropores and microcracks(400-600 nm)serving as the primary seepage channels.In type II laminations,the proportions of intragranular pores increases,and as the intensity of the carbonate lamina decreases,the radii of the main seepage channels shrink to 25-63 nm.In Type III laminated shale,intragranular pores dom-inate the pore space,with mesopores accounting for more than 90%of the storage capacity.Pores and throats of 25-63 nm are the primary seepage channels.The structure and arrangement of the laminae are key factors influencing the storage and seepage capacities of laminated carbonaceous shales,as they control the genesis and microstructure of pores.Additionally,variations in organic matter and inorganic mineral content enhance these distinctions by affecting the preservation and mor-phology of micro-and mesopores.关键词
纹层状富碳酸盐页岩/纹层结构/微观储渗能力/微观非均质性/控制因素Key words
laminated carbonaceous shale/lamination structure/microscopic storage and seepage capacities/microscopic heterogeneity/controlling factors分类
石油、天然气工程引用本文复制引用
孔政,程紫燕,乔俊程,张玉亮,曾溅辉,王云鹤,李静逸,刘姝宁,刘新龙..东营凹陷牛庄洼陷古近系不同纹层组合富碳酸盐页岩的微观储渗能力[J].中国石油大学学报（自然科学版）,2025,49(2):68-81,14.基金项目
国家自然科学基金青年基金项目(42302144) （42302144）
中央高校基本科研业务经费项目(2462023BJRC012) （2462023BJRC012）
