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鄂尔多斯盆地华庆油田延长组长63油藏属于典型的低孔、特低渗储层。应用铸体薄片鉴定、扫描电镜、压汞等实验,从岩石学、孔隙结构和成岩作用三个方面,分析了华庆地区长63段储层低孔、特低渗的原因。结果表明:储层长石及岩屑含量高、成分成熟度低,压实程度中等偏强是储层孔隙度低的根本原因;溶蚀作用和微观非均质性较强,且多期次胶结填隙孔喉,造成孔隙结构复杂、喉道半径细小,渗透率进一步降低。
Chang 63 reservoir of Yanchang Formation in Huaqing Oilfield, Ordos Basin belongs to typical low-porosity and ultra-low permeability reservoirs. The application of casting thin slice identification, scanning electron microscopy and mercury intrusion porosimetry was used to analyze the reason of low porosity and low permeability of Chang 63 reservoir in Huaqing area from three aspects of petrology, pore structure and diagenesis. The results show that the content of feldspar and lithic fragments in the reservoir is low, the composition maturity is low and the compaction degree is moderately strong, which is the fundamental reason for the low porosity of the reservoir. The dissolution and microscopic heterogeneity are strong, Caustic pore throats, resulting in complex pore structure, small throat radius, permeability to further reduce.