| 王丹丹,王雅春,刘蓥霖,李田野,张雷,金翔雄.鄂尔多斯盆地下寺湾油田长2段储层特征[J].矿产勘查,2022,13(10):1477-1483 |
| 鄂尔多斯盆地下寺湾油田长2段储层特征 |
| Reservoir characteristics of Chang 2 member in Xiasiwan oil field, Ordos Basin |
| 投稿时间：2021-10-24 |
| DOI：10.20008/j.kckc.202210008 |
| 中文关键词: 低孔渗砂岩 微观孔隙结构 鄂尔多斯盆地 长2段储层 |
| 英文关键词: low porosity and permeability sandstone micro pore structure Ordos Basin Chang 2 member reservoir |
| 基金项目:本文受重庆科技学院硕士研究生创新计划项目“不同沉积环境泥页岩层系孔喉结构主控因素研究”(YKJCX2020134)及重庆市自然科学基金面上项目“不同类型页岩层系储层孔喉结构差异性对储层物性影响作用研究”(cstc2020jcyj-msxmX0657)联合资助。 |
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| 中文摘要: |
| 为了明确目前鄂尔多斯盆地下寺湾油田延长组长2段低孔渗砂岩储层特征,通过扫描电镜、岩石铸体薄片观察和阴极发光实验,结合高压压汞实验,辅助以图像粒度和油水相渗曲线分析对长2段储层特征进行研究。研究结果表明:该区主要发育中细粒长石砂岩,少量细粒岩屑长石砂岩。储集空间类型主要以溶蚀的粒间孔、粒内孔为主,少量铸模孔和微裂缝。毛细管压力曲线上排驱压力小的曲线整体偏于粗歪度,分选系数平均为1.78,中值喉道半径平均值0.079 μm,孔隙半径平均值13.06 μm,该区主要发育I类和III类储层,油水两相在孔隙空间中共同渗流时的干扰作用较大。可见该段储层窄喉道在整个孔隙喉道中占主导,不利于油气的渗流。对该储层特征的研究,为该区进一步勘探开发提供参考依据。 |
| 英文摘要: |
| In order to clarify the characteristics of low porosity and ultra-low permeability sandstone reservoir in chang 2 member of Yanchang formation in Xiasiwan oil field, Ordos Basin. The study carried out scanning electron microscope, rock casting thin section observation and cathodoluminescence experiment,combined with high-pressure mercury injection experiments, assisted by image particle size and oil-water phase permeability curve analysis to study the characteristics of Chang 2 reservoir. The results show that:the area is mainly developed in fine-grained feldspar sandstone, and a small amount of fine-grained lithic feldspar sandstone. The reservoir space types are mainly intergranular pores and intragranular pores, with a small amount of moldic pores and microfractures. The curve with small displacement pressure on the capillary pressure curve is generally skewed, with an average sorting coefficient of 1.78, an average median throat radius of 0.079 μm and an average pore radius of 13.06 μm. Class I and III reservoirs are mainly developed in this area, and the interference effect of oil-water two phases in the joint seepage in pore space is great.It can be seen that the narrow throat of the reservoir is dominant in the whole pore throat, which is not conducive to oil and gas storage and seepage.The reservoir characteristics are studied to provide reference for further exploration and development in this area. |
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