摘要
针对鄂尔多斯盆地华庆地区长6_(3)致密砂岩储层,运用铸体薄片和高压压汞实验对其储层微观特征进行研究。根据毛管压力曲线将储层分三类,并对每种类型储层孔喉结构的分形维数进行研究,根据分形维数将储层中孔喉结构分为较大和较小两类,最后其影响因素进行探讨。结果表明:Ⅰ类储层非均质性最差,储层物性最好,Ⅲ类储层非均质性最强,储层物性最差,Ⅱ类储层介于两者之间。较大孔喉的分形维数通常大于3,说明其孔喉结构复杂,孔隙和喉道半径差距较小,不利于油气运移;较小孔喉分形维数一般介于2~3之间,孔喉半径差距较小,均一性较好。影响储层孔喉结构差异的因素主要有岩石成分和成岩作用。
This paper studies the microscopic characteristics of the Chang 6_(3)tight sandstone reservoir in the Huaqing area of the Ordos Basin.The microscopic characteristics of the reservoirs were studied by casting thin sections and high-pressure mercury intrusion experiments.According to the capillary pressure curve,the reservoirs are divided into three types,and the fractal dimension of the pore throat structure of each type of reservoir is studied.According to the fractal dimension,the pore-throat structure in the reservoir is divided into two categories:larger and smaller.Finally,the influencing factors are discussed.The results show that:Type Ⅰ reservoirs have the worst heterogeneity and the best reservoir physical properties.Type Ⅲ reservoirs have the strongest heterogeneity and the worst reservoir physical properties.Type Ⅱ reservoirs are in between.The fractal dimension of larger pore throats is usually greater than 3,indicating that the pore throat structure is complex,and the gap between pore and throat radius is small,which is not conducive to oil and gas migration.The fractal dimension of the smaller pore throat is generally between 2 and 3,the difference between the radius of the pore throat is small,and the uniformity is better.The main factors affecting the difference of reservoir pore throat structure are rock composition and diagenesis.
作者
何子琼
王诗怡
蒋正昊
He Ziqiong;Wang Shiyi;Jiang Zhenghao(Architecture&Project Engineering,Chengdu Jincheng College,Chengdu 611731,China)
出处
《云南化工》
CAS
2023年第1期139-142,共4页
Yunnan Chemical Technology
基金
国家科技重大专项专题(2017ZX05005002-004)
国家油气重大专项项目(2016ZX05046-002)。
关键词
鄂尔多斯盆地
华庆地区
延长组
储层微观特征
Ordos basin
Huaqing area
Yanchang formation
reservoir microscopic characteristics
