江汉盆地马王庙地区古近系新沟嘴组下段沉积相及其演化

通过对岩石学特征、沉积构造、沉积层序和测井相等的综合分析表明，江汉盆地马王庙地区古近 系新沟嘴组下段发育三角洲-湖泊沉积体系，包括三角洲平原、三角洲前缘、前三角洲、滨浅湖和膏盐湖等亚 相类型。在沉积相类型识别的基础上，根据单因素分析多因素综合作图法，编制了马王庙地区新沟嘴组下段各 油组地层等厚图、砂岩等厚图、砂地比等值线图和典型单井优势相投影图等单因素图件。综合分析各单因素图， 绘制了马王庙地区新沟嘴组下段Ⅰ、Ⅱ和Ⅲ共３个油组的沉积相图，并探讨了其沉积相平面展布特征和演化规 律：古近纪新沟嘴组下段沉积时期，研究区的物源来自北东和北西方向，并分别向南西和南东方向展布，依次 发育三角洲平原-三角洲前缘-前三角洲亚相，其中以三角洲前缘的水下分流河道和席状砂微相最为发育；两 支三角洲砂体周围为滨浅湖沉积。自Ⅲ油组到Ⅱ、Ⅰ油组沉积时期，研究区水体经历了由浅变深再变浅的过程； Ⅲ油组和Ⅱ油组沉积时期，三角洲砂体分布面积广，储集层发育较好。

Sedimentary facies and its evolution of the Lower Member of Paleogene Xingouzui Formation in Mawangmiao area of Jianghan Basin

Based on the petrology,sedimentary structure,sedimentary sequence and logging facies etc.,the delta and lacustrine sedimentary system is recognized in the Lower Member of Paleogene Xingouzui Formation in Mawangmiao area,which includes the delta plain,delta front,prodelta,shore-shallow lake and gypsum lacustrine subfacies.According to the above analyses,the single-factor analysis and multifactor comprehensive mapping method was used to compile the strata isopach maps,sandstone isopach maps,sandstone istrata ...