岩性油气藏 ›› 2021, Vol. 33 ›› Issue (5): 120131.doi: 10.12108/yxyqc.20210511
杜猛1,2,3, 向勇1, 贾宁洪2,3, 吕伟峰2,3, 张景4, 张代燕4
DU Meng1,2,3, XIANG Yong1, JIA Ninghong2,3, LYU Weifeng2,3, ZHANG Jing4, ZHANG Daiyan4
摘要: 玛湖凹陷百口泉组是重要的砂砾岩油气聚集区。为了研究玛湖凹陷百口泉组致密砂砾岩储层的孔隙结构特征,开展了压汞、核磁共振、铸体薄片等分析,结合微米CT扫描技术、扫描电镜矿物定量评价(QEMSCAN)及MAPS显微图像拼接技术,从尺度与精度、二维与三维综合开展其微观孔隙结构特征研究。结果表明:①玛湖凹陷百口泉组致密砂砾岩储层孔喉尺度分布广泛,呈现较明显双峰特征,大尺度孔喉为亚微米-微米级,而小尺度孔喉为纳米-亚微米级,以0.5~4.0 μm喉道贡献率最高,微米级孔喉对渗流的贡献较大。②微米尺度下,孔隙结构具有强非均质性,复模态等特点,孔隙类型以溶蚀孔、粒间孔及微裂缝为主,孔隙展布状态主要有条带状和孤立状2种,孔隙连通性比孔隙尺度对渗流的贡献更大。③纳米尺度下,扫描电镜确定其主要矿物为石英和长石,粒间压实作用充分,颗粒形状结合紧密,不同孔渗的样品基质内纳米级微孔形态各异,多以分布于矿物颗粒(晶体)内部蜂窝状长石溶蚀孔或填隙物表面微孔为主,可见方解石颗粒解理缝,对微米级球状微孔及纳米级溶孔起到较好的沟通作用。该研究成果可为致密砂砾岩储层孔隙结构表征及"甜点"预测提供借鉴。
中图分类号:
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