吴松涛1,2,林士尧3,晁代君3,翟秀芬1,王晓瑞4,黄秀1,2,徐加乐4
Wu Song-tao1,2,Lin Shi-yao3,Chao Dai-jun3,Zhai Xiu-fen1,Wang Xiao-rui4,Huang Xiu1,2,Xu Jia-le4
摘要: 以鄂尔多斯盆地华庆地区长6致密砂岩为研究对象,利用QEMSCAN、光学显微镜、场发射扫描电镜、微米CT、高压压汞、核磁共振等方法对孔隙结构与可动流体进行了研究。结果表明,华庆地区长6储层发育原生粒间孔、颗粒溶蚀孔与粒间溶蚀扩大孔,以钾长石、岩屑、方解石溶蚀为主;CT三维孔喉模型指示孔喉连通性中等—好,连通孔隙体积比例与储层物性呈正相关关系。长6致密砂岩可动流体饱和度介于70%~90%之间,可动油饱和度介于40%~65%之间,与储层物性呈正相关关系。不同渗透率样品可动流体与可动油分布的优势孔喉尺寸具有差异性,当空气渗透率从大于1 ×10-3μm2到(0.1~1)×10-3μm2再到小于0.1×10-3μm2,可动流体饱和度分布的优势孔喉半径从0.1~1μm减小到0.01~0.1μm再到0.001~0.01μm,可动油饱和度分布的优势孔喉半径从1~10μm减小到0.1~1μm再到0.001~0.01μm。研究结果有助于进一步明确致密砂岩储层微观孔隙结构与可动流体的关系,为鄂尔多斯盆地致密油勘探开发提供参考依据。
中图分类号:
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