四川盆地简阳区块须家河组具有较高的勘探潜力,须五段不仅是一个重要的烃源岩层,还具有显著的成藏潜力。为了明确须五段储层特征,评估其资源潜力,本文基于岩心、铸体薄片、电镜扫描等资料,对研究区须家河组须五段储层特征进行了系统分析,通过测井资料对须五段岩性、裂缝进行识别并建立储层分类标准,开展储层有效性评价。研究表明,1) 须五段发育典型的煤–页–砂岩互层,为特低孔特低渗致密砂岩储层;2) 通过测井资料可以有效识别须五段的不同岩性及裂缝并建立以煤–页–砂岩互层为主的储层分类标准;3) 储层基质孔隙发育差导致产能低下,裂缝发育程度较高的储层具有更高的产能,煤–页–砂岩互层具有较高的产能,有利于天然气的聚集。研究结果能为研究区后续勘探开发提供重要依据。Xujiahe Formation has high exploration potential in Jianyang area, Sichuan Basin. Xu 5th Member is not only an important source rock, but also has significant reservoir formation potential. In order to clarify the reservoir characteristics of Xu 5th Member and evaluate its resource potential, this paper systematically analyzes the reservoir characteristics of Xu 5th Member of Xujiahe Formation in the study area based on core, cast thin section and electron microscope scanning data, identifies lithology and fractures of Xu 5th Member through logging data, establishes reservoir classification criteria, and carries out reservoir effectiveness evaluation. The results show that: 1) The typical coal-shale-sandstone interlayer developed in Xu 5th Member is a tight sandstone reservoir with extremely low porosity and permeability;2) Different lithology and fractures of Xu 5th Member can be effectively identified by logging data, and a classification standard of reservoirs based on coal-shale-sandstone interlayers can be established;3) The poor development of reservoir matrix pores leads to low productivity. Reservoirs with higher fracture development have higher productivity, and coal-shale-sandstone interbeds have higher productivity, which is conducive to the accumulation of gas. The research results can provide important basis for subsequent exploration and development in the study area.
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