岩性油气藏 ›› 2017, Vol. 29 ›› Issue (3): 1826.doi: 10.3969/j.issn.1673-8926.2017.03.003
闫建平1,2, 梁强2, 耿斌3, 赖富强4, 温丹妮5, 汪宙峰2
YAN Jianping1,2, LIANG Qiang2, GENG Bin3, LAI Fuqiang4, WEN Danni5, WANG Zhoufeng2
摘要: 低渗透砂岩已成为油气增储上产的重要勘探开发目标,但孔隙结构类型多样、微孔发育使得测井响应特征难以明显反映储层及其有效性。利用压汞、核磁共振、物性、薄片及CT等资料分析东营凹陷南斜坡沙四段(Es4)低渗透滩坝砂岩孔隙结构,并将其划分为三大类五小类,即:Ⅰ类(Ⅰ1和Ⅰ2)、Ⅱ类(Ⅱ1和Ⅱ2)和Ⅲ类。孔隙结构类型受控于矿物、粒径及成岩作用等的综合影响,微孔(孔喉半径<0.024 8 μm)含量及其特征是造成孔隙结构类型差异的重要因素。在此基础上,分析矿物含量、粒径、电性与微孔含量的关系,发现矿物、粒径影响微孔含量及特征,且微孔含量与电性特征关系密切。利用测井曲线对低渗透砂岩微孔含量变化的敏感性,有助于在井筒剖面进行孔隙结构类型划分及识别有效储层。
中图分类号:
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