综合利用测井曲线、岩心及沉积岩的颜色、类型和沉积构造的特点对定边4930井区延9储层进行沉积微相研究,认为定4930井区延9期的沉积相为三角洲相。根据沉积岩组合、煤层的发育确定研究区延9为三角洲平原亚相。进一步可以划分为分流河道、天然堤、决口扇以及沼泽4种微相类型。通过沉积相带对油气的控制作用分析,指出有利的油气聚集带,可为油气开发提供参考。 The sedimentary microfacies of Yan 9 reservoir in Dingbian 4930 well area are comprehensively studied by using the well logging curves, the color and type of cores and sedimentary rocks, and the characteristics of sedimentary structures. It is concluded that the sedimentary facies of Yan 9 reservoir in Ding 4930 well are delta facies. According to the sedimentary assemblage, the development of the coal seam confirms that Yan 9 is the delta plain in the study area. Further divided into distributary channels, natural dike, ripple fan and marsh four kinds of microfacies. Through the analysis of the controlling action of sedimentary facies on hydrocarbon, it is pointed out that favorable hydrocarbon accumulation zone can provide a reference for oil and gas exploration.