
科学技术与工程

中国技术经济学会
鄂尔多斯盆地定边地区长4+5油层黏土矿物对储层的影响因素
焦语婷 , 李涛 , 何松霖 , 修静泽 , 刘国文 , 石桓山 , 胡望水
科学技术与工程 ›› 2026, Vol. 26 ›› Issue (4) :1449-1456
鄂尔多斯盆地定边地区长4+5油层黏土矿物对储层的影响因素
Influence Factors of Clay Minerals on Reservoir in Chang 4+5 Oil Formation in Dingbian Area of Ordos Basin
黏土矿物通常在长石砂岩、岩屑砂岩、石英砂岩中对湖盆成分和结构造成影响,通常情况下黏土矿物会影响储层孔隙大小。通过成岩作用研究对岩石矿物组分进行分类,利用扫描电镜、X射线衍射、恒速压汞等方法综合定量化评价致密砂岩过程中孔隙度、渗透率演化特征。结果表明:长4+5油层三角洲前缘亚相6个沉积微相石类型以细粒岩屑长石砂岩和细粒长石砂岩为主,发育少量细粒长石岩屑砂岩。胶结物有硅质,铁方解石,高岭石,绿泥石,伊利石。其中绿泥石充填孔隙以杂基形式存在,破坏储层作用薄膜赋予孔隙表面起到建设作用,伊利石对储层有破坏作用,高岭石在储层中起到建设作用。研究成果为鄂尔多斯盆地及类似强非均质性储层的甜点预测提供了理论依据。
The composition and structure of lacustrine basins in arkose,lithic sandstone,and quartz sandstone are commonly influenced by clay minerals. Reservoir pore size is generally affected by these minerals. Rock mineral components were classified through diagenesis research. Scanning electron microscopy,X-ray diffraction,and constant-rate mercury injection were employed for analysis. The evolution of porosity and permeability in tight sandstone was quantitatively evaluated. The results show that Chang 4+5 oil layer delta front subfacies contain six sedimentary microfacies. Fine-grained lithic arkose and fine-grained arkose are identified as the main rock types. A minor amount of fine-grained feldspathic lithic sandstone is developed. The cements consist of siliceous material,ferrocalcite,kaolinite,chlorite,and illite pores are filled with chlorite as matrix. Reservoir damage is caused by chlorite in this form. However,a constructive effect is provided by chlorite coatings on pore surfaces. The reservoir is damaged by illite. In contrast,a constructive role is played by kaolinite. The research findings provide a theoretical basis for sweet spot prediction in the Ordos Basin and similar highly heterogeneous reservoirs.
鄂尔多斯盆地 / 长4+5油层 / 浊沸石 / 定边地区 / 储层因素
Ordos Basin / Chang 4+5 oil formation / turbidite / Dingbian area / reservoir factors
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