2023年1月云南化工Jan．2023第50卷第1期YunnanChemicalTechnologyVol.50，No.1doi:10.3969/j.issn.1004-275X.2023.01.38鄂尔多斯盆地华庆地区长63致密砂岩储层微观特征研究*何子琼，王诗怡，蒋正昊(成都锦城学院建筑学院，四川成都611731)摘要:针对鄂尔多斯盆地华庆地区长63致密砂岩储层，运用铸体薄片和高压压汞实验对其储层微观特征进行研究。根据毛管压力曲线将储层分三类，并对每种类型储层孔喉结构的分形维数进行研究，根据分形维数将储层中孔喉结构分为较大和较小两类，最后其影响因素进行探讨。结果表明:Ⅰ类储层非均质性最差，储层物性最好，Ⅲ类储层非均质性最强，储层物性最差，Ⅱ类储层介于两者之间。较大孔喉的分形维数通常大于3，说明其孔喉结构复杂，孔隙和喉道半径差距较小，不利于油气运移;较小孔喉分形维数一般介于2～3之间，孔喉半径差距较小，均一性较好。影响储层孔喉结构差异的因素主要有岩石成分和成岩作用。关键词:鄂尔多斯盆地;华庆地区;延长组;储层微观特征中图分类号:P618文献标识码:A文章编号:1004－275X(2023)01－0139－04StudyonMicroscopicCharacteristicsofChang63TightSandstoneＲeservoirinHuaqingArea，OrdosBasin*HeZiqiong，WangShiyi，JiangZhenghao(Architecture＆ProjectEngineering，ChengduJinchengCollege，Chengdu611731，China)Abstract:ThispaperstudiesthemicroscopiccharacteristicsoftheChang63tightsandstonereservoirintheHuaqingareaoftheOrdosBasin．Themicroscopiccharacteristicsofthereservoirswerestudiedbycastingthinsectionsandhigh－pressuremercuryintrusionexperiments．Accordingtothecapillarypressurecurve，thereservoirsaredividedintothreetypes，andthefractaldimensionoftheporethroatstructureofeachtypeofreservoirisstudied．Accordingtothefractaldimension，thepore－throatstructureinthereservoirisdividedintotwocategories:largerandsmal-ler．Finally，theinfluencingfactorsarediscussed．Theresultsshowthat:TypeIreservoirshavetheworstheterogeneityandthebestreservoirphysicalproperties．TypeⅢreservoirshavethestrongestheterogeneityandtheworstreservoirphysicalproperties．TypeIIreservoirsareinbe-tween．Thefractaldimensionoflargerporethroatsisusuallygreaterthan3，indicatingthattheporethroatstructureiscomplex，andthegapbe-tweenporeand...
