华东地质2026，Vol.47Issue(3)：432-451,20.DOI:10.16788/j.hddz.32-1865/P.2024.11.010
二连盆地吉尔嘎朗图凹陷白垩系页岩油储层特征及其对含油性的控制
Characteristics of Cretaceous shale oil reservoirs and their control on oil content in the Jiergalangtu Sag,Erlian Basin
摘要
Abstract
The Jiergalangtu Sag in the Erlian Basin is rich in shale oil and gas resources with significant ex-ploration potential.However,the oil content,pore structure characteristics,and controlling mechanisms of its Cre-taceous shale oil reservoirs remain unclear.By employing a combination of total organic carbon(TOC),conven-tional Rock-eval pyrolysis,multistage Rock-eval pyrolysis,X-ray diffraction,scanning electron microscopy,low-temperature nitrogen adsorption,high-pressure mercury injection,and one-dimensional/two-dimensional nuclear magnetic resonance(NMR),this study systematically reveals the oil content and full-scale pore-throat distribution characteristics of shale oil reservoirs,while exploring the coupling relationships between oil content,mineral com-position,and pore structure.The results reveal that the shale in the lower first member of Tengger Formation(K1bt1)demonstrates higher organic matter abundance and superior storage properties compared to the fourth member of Aershan Formation(K1ba4).It features more developed large pores and throats,which enhance shale oil storage and flow.Conversely,the shale in the K1ba4 has lower organic matter abundance,with micropores and throats dominating,resulting in poorer storage and flow.The development of pores and throats is primarily influ-enced by TOC and clay mineral content.High TOC and low clay mineral content favor the formation of macrop-ores and throats in the lower K1bt1,enhancing its storage and flow properties.However,higher TOC may inhibit the development of macropores and throats in the K1ba4.Shale oil content is jointly determined by TOC,maturity,and pore structure,with TOC being the most critical factor,particularly for the K1ba4.The research results pro-vide an important basis for evaluating"sweet spots"in shale oil reservoirs within the Jiergalangtu Sag.关键词
页岩油/储层特征/孔喉结构/含油性/核磁共振/二连盆地Key words
shale oil/reservoir characteristics/pore and throat structure/oil-bearing characteristics/nuclear magnetic resonance(NMR)/Erlian Basin分类
天文与地球科学引用本文复制引用
项鑫,王军杰,谢佩宇,卢双舫,郑荣华,李彬,邢雅文,王攀,赵懿..二连盆地吉尔嘎朗图凹陷白垩系页岩油储层特征及其对含油性的控制[J].华东地质,2026,47(3):432-451,20.基金项目
自然资源部"十四五"规划"中石油矿业权区及周边空白区油气资源评价(编号:QGYQZYPJ2022-1)"项目资助. （编号:QGYQZYPJ2022-1）
