山东国土资源2026，Vol.42Issue(2)：59-67,9.DOI:10.12128/j.issn.1672-6979.2026.02.006
基于岩心流动试验的德州市馆陶组松散砂岩渗透性分析
Analysis on Permeability of Loose Sandstone in Guantao Formation in Dezhou City Based on Core Flow Tests
摘要
Abstract
In order to reveal the permeability evolution mechanism of loose sandstone during geothermal re-injection,taking the unconsolidated sandstone of Guantao dormation in Dezhou city in Shandong province as the research object(φ25mm×50mm),by using core flow meter,multi-factor control test has been carried out.The influence of temperature(20～100℃),confining pressure(5～20 MPa)and injection rate(1.0～2.5mL/min)on permeability has been analyzed systematically.It is showed that the increase of tem-perature will lead to the overall decrease of rock permeability,which is closely related to the thermal ex-pansion effect of rock particles.The higher the temperature,the greater the gravel discharge.The critical pressure of pore closure in unconsolidated sandstone(buried depth is 1311～1312m)of Guantao formation in Dezhou city is about 15 MPa.At this point,the pore structure undergoes critical closure,and the perme-ability will drop by 48.9%.The change in permeability of loose sandstone under low injection rate is weak and negligible,but the increase of injection rate will significantly increase the amount of fluid carrying gravel and affect the overall permeability of rock mass.It is speculated that high injection rate is the domi-nant factor inducing blockage in the near wellbore area of the reinjection well.It is suggested that the injec-tion strategy of"first low and then stable,step lifting"should be carried out in the recharge design.关键词
地热资源/未固结砂岩/渗透性/岩心流动试验/山东德州Key words
Geothermal resource/unconsolidated sandstone/permeability/core flow test/Dezhou city in Shandong province分类
建筑与水利引用本文复制引用
刘毅,杜金亮,段晓飞,王学鹏,张航星,黄星,战静华..基于岩心流动试验的德州市馆陶组松散砂岩渗透性分析[J].山东国土资源,2026,42(2):59-67,9.基金项目
山东省2024年部省协议地质勘查项目,山东省德州地区氦气资源调查评价(任务书编号为鲁勘字[2024]58号) （任务书编号为鲁勘字[2024]58号）
山东省地质矿产勘查开发局2025年科技创新项目,地热资源群井采灌条件下开发利用关键参数研究(任务书编号为:鲁地字[2025]27号) （任务书编号为:鲁地字[2025]27号）
