大庆石油地质与开发2024，Vol.43Issue(4)：105-115,11.DOI:10.19597/J.ISSN.1000-3754.202402043
松辽盆地古龙页岩纳米孔喉体系中页岩油组分及成熟度分异效应
Differentiation effect of components and maturity of shale oil in nano-pore throat system of shales in Gulong Sag,Songliao Basin
摘要
Abstract
Micro-migration effect in continental shale oil reservoirs may lead to property differentiation of shale oil in micro-pore spaces.However,small pore radius and complex pore-throat structure of shale reservoirs are difficult to be finely characterized by conventional methods,causing unclear understanding of the microscopic enrichment mechanism of shale oil.Differentiation effect of oil components and maturity in nano-pore throat system of shale res-ervoir is revealed by experiments of stepwise extraction and low-temperature nitrogen adsorption,as well as geo-chemical analysis including total hydrocarbon gas chromatography,group component quantification,saturated hy-drocarbon gas chromatography-mass spectrometry(GC-MS)and diamondoids gas chromatography-mass spectrome-try-mass spectrometry(GC-MS-MS)of shale core samples of Qingshankou Formation in Gulong Sag of Songliao Ba-sin.The results show mesopores predominantly in the shales of Gulong Sag.With stepwised decrease of particle size of shale samples,more pores with poor initial connectivity are released,along with relative increase of heavy com-ponents and stronger polarity of hydrocarbon in microscopic nano-pore throats,and relatively higher maturity of shale oil.This is correlated with expulsion and micro-migration effect of shale oil in pore spaces with different con-nectivity.The research provides effective technical method to finely characterize microscopic occurrence character-istics of shale oil and to illustrate microscopic differential enrichment mechanism of hydrocarbon in shale oil reser-voirs,and provides reliable theoretical basis for shale oil mobility evaluation and"sweet spots"optimization.关键词
古龙页岩/分步-接力抽提/纳米孔喉体系/烃类差异富集机理/组分分异效应/成熟度分异效应Key words
Gulong shale/stepwised extraction/nano-pore throat system/differential enrichment mechanism of hydrocarbon/differentiation effect of shale oil components/differentiation effect of shale oil maturity分类
能源科技引用本文复制引用
张婧雅,窦立荣,朱如凯,刘一杉,曾花森..松辽盆地古龙页岩纳米孔喉体系中页岩油组分及成熟度分异效应[J].大庆石油地质与开发,2024,43(4):105-115,11.基金项目
国家自然科学基金重大项目"中国中西部典型盆地陆相页岩油形成演化与富集机理"(42090020)子课题"陆相页岩油富集主控因素与有利区带评价方法"(42090025) （42090020）
国家自然科学基金青年基金项目"热演化对陆相页岩油孔隙结构和烃类差异聚集的控制作用"(4230020609) （4230020609）
黑龙江省"揭榜挂帅"科技攻关项目"古龙页岩储层成岩动态演化过程与孔缝耦合关系研究"(2021ZXJ01A09). （2021ZXJ01A09）
