基于动静态实验与核磁共振技术的低渗透砂岩储层酸岩溶蚀机制研究

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中图分类号：TE343 文献标志码：A 文章编号：1000-7393（2025）-04-0452-12

Abstract：Itiscrucialforoptimizingacidfluidselectionandenhancingacidificationefecttoinvestigatetheacidrockdissolution

mechanism oflow-permeablityreservoirsand clarifytheimpactofsuch factors asshalecontentandacid fluidconcentrationon

dissolution efficiency. Combining two experimental approaches—static dissolution （mineral rock plate at 20～60∘C ）and dynamic

flow （with acid fluid concentration 1%～5% ， core permeability ，and shale content 8%～44% ）， the dissolution

lawsof hydrohloricacid，udacidndaceticacidereaalyeduderriousifluencingfactors.Iadition，ucleargetic

resonanceonlinemonitoring technology was introduced to evaluatethechanges in poreconfigurationbeforeandafteracid

displacement. The results show that quartz exhibits strong acid resistance（dissolution rate <3% after 24 hours）， while montmorillonite is easily dissolved （dissolution rate of 54.46% after 24 hours）. As the temperature rises， the dissolution rate gradually increases. Increass nockpeablityidfidoentrato，ndaleotentallotribe taedcidsolutooe permeability cores present better acidizing efect than low-permeability cores. After displacement with 5% mud acid， the optimal dissolution effect is achieved， core porosity is increased by 14.39% and permeability improved by 76.30% . Overall， clay minerals （particularly montmorillonite） are key factors influencing acidizing efficiency.The use of 5% mud acid is recommended for acidizing low-permeability sandstone reservoirs with shale content ≥20% . The application of nuclear magnetic resonance-mercury penetration coupling technique improves the accuracy of pore configuration description by over 10%

KeyWords：low-permeabilitysandstonereseoir;acidification;dissolutionlaw;NMR;shalecontent; dynamicandstaticexperet

0 引言

随着勘探开发技术不断进步，低渗和特低渗油藏已成为我国油气资源开发的重点领域[1-2]。（剩余20963字）