【摘要】 基于岩心、测井、地震及分析化验资料,在区域研究基础上,以X区块为例,对鄂尔多斯盆地东缘北段晚古生代开展了沉积相研究。在研究区共识别出潮坪、沼泽、三角洲、曲流河、辫状河等沉积相类型。通过井震标定及地震相特征分析,河道(分流河道)砂体在剖面上表现为弱振幅、低频不连续、杂乱反射;河漫滩及分流河道间湾表现为强振幅、高频连续反射特征,反射界面较为清楚;垂直河道走向剖面上其外形为顶平底凹或顶凸底凹的透镜体状,内部杂乱或无反射,或为上超式充填反射。从研究区平面沉积相展布图来看,本区发育的河流-三角洲沉积大致呈南北向展布,河道宽约2km~3km,河道叠置区为研究区有利储层最为发育区。更多还原

【Abstract】 Based on core,well log,seismic and testing data,and region geological analysis,we study sedimentary facies of north section of eastern Ordos basin in late paleozoic taking the X block as an example.Several sedimentary facies types are identifies in the study block,including tidal-flat,marsh,delta,meandering and braided river.By well- seismic facies analyzing,channel(distributary channel)sand bodies show weak amplitude,low frequency discontinuity,chaotic seismic reflection configuration,silty mud from flood-plain and distributary bay shows strong amplitude,high frequency continuity characteristics,reflecting interface is clear.The channel shows lenticular shape in seismic profile,chaotic seismic reflection configuration,oronlapfill.By sedimentary facies distribution of the area,fluvial-delta extend along south and north direction,channel width is about 2km ~3km,stacked channels area is the optimum reservoir development area.更多还原