石油科学通报2024，Vol.9Issue(4)：648-658,11.DOI:10.3969/j.issn.2096-1693.2024.04.049
基于三维数字岩心的油页岩裂解孔隙重构及表征研究
Characterization of oil shale pore and fractures during pyrolysis using digital rock reconstruction
摘要
Abstract
As the primary conduit for oil and gas seepage,the pore and fracture structure of oil shale undergoes intricate changes during pyrolysis.However,the lack of understanding regarding its variations hinders effective reservoir classification and devel-opment.Therefore,it is important to investigate the influence of oil shale pyrolysis on pore structure at different temperatures and organic matter content.This paper proposes a new method based on 3D digital core reconstruction to quantify fractures and pore structures.The methodology employs parameters such as fracture width,fracture orientation,fractal dimension,and porosity to assess changes in pore and fracture structures throughout the pyrolysis process.The findings are as follows:(1)The proposed digital rock processing method and midplane extraction algorithm for fractured rock can accurately calculate fracture width and fracture orientation distribution.(2)As pyrolysis temperature increased,the porosity of oil shale samples rose from 18.3%to 20.9%,with a corresponding increase in fracture width,indicating improvements in the physical properties of the samples.However,the rate of change in pore and fracture structures decreased after pyrolysis(3)For fractured oil shale samples,porosity increased from 12.1%to 29.3%with higher organic matter content at consistent temperatures.However,Fractal analysis shows that pyrolysis fracture complexity is governed by both the content and,importantly,the initial spatial distribution of organic matter.This provides a new perspective for the precise characterization of pore structure after fracturing oil shale.关键词
数字岩心/三维重构/油页岩/高温热解/孔隙结构表征Key words
digital rock/3D reconstruction/oil shale/high temperature pyrolysis/pore structure characterization分类
天文与地球科学引用本文复制引用
王斌,孙廉贺,杨睿月,杨兵,王海柱,张云鹏,王全,刘铭盛..基于三维数字岩心的油页岩裂解孔隙重构及表征研究[J].石油科学通报,2024,9(4):648-658,11.基金项目
国家青年科学基金项目"粗糙迂曲缝内超临界CO2微细支撑剂携带机理研究"(52204021)和国家自然科学基金专项项目"页岩油储层超临界CO2聚能压裂与封存基础研究"(52341401)联合资助 （52204021）
