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1. 西安石油大学地球科学与工程学院
2. 中国石油天然气股份有限公司长庆油田分公司勘探开发研究院
Published:2026
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陈琪泉, 李超, 成友友, et al. 致密砂岩储层孔隙结构对流体可动程度的影响及综合表征[J]. Bulletin of Geological Science and Technology, 2026, 45(2): 91-105.
陈琪泉, 李超, 成友友, et al. 致密砂岩储层孔隙结构对流体可动程度的影响及综合表征[J]. Bulletin of Geological Science and Technology, 2026, 45(2): 91-105. DOI: 10.19509/j.cnki.dzkq.tb20240683.
储层流体可动程度受储层物性及孔隙结构的综合影响显著,单一参数无法准确表征。为了明确孔隙结构综合表征在流体可动程度评价中的有效性,针对鄂尔多斯盆地合水地区三叠系延长组长8
2
致密砂岩储层,旨在探究孔隙结构参数与流体可动程度的关系。采用核磁共振(NMR)、高压压汞(HPMI)联测的实验方法,计算有效可动流体孔隙度(φ
cutoff
)及有效可动流体孔喉半径(r
cutoff
),并结合分形理论分析孔隙结构。进而使用主成分分析法(PCA)提取因子,并引入k-means聚类分析法,建立了致密砂岩流体可动程度综合评价方法。结果表明:研究区目的层孔喉类型以中小孔—中细喉为主,可动流体主要赋存在孔喉半径0.01~1.0μm的孔隙中;分形维数介于2.440 0~2.741 2之间,平均值2.55;有效可动流体孔喉半径介于0.016~0.095μm之间,平均值为0.049μm;有效可动流体孔隙度介于0.716%~2.980%之间,平均值为1.598%。综合流体可动程度参数、物性参数、孔隙结构参数,提取4个主成分,分别评估储层渗流能力与储集能力、微观非均质性、产出能力、大孔喉占比。基于前3个主成分输出聚类结果,将实验样品划分为Ⅰ类、Ⅱ类、Ⅲ类。流体可动程度的综合评价结果可为同类型致密砂岩油藏储层评价及高效开发提供一定依据。
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