胡尖山地区延长组长8、长9段沉积微相研究

Study on Sedimentary Facies in Chang8-9 of Yangchang Formation,Upper Triassic in Hu Jianshan Area,Ordos Basin

胡尖山地区延长组主要以河流、湖泊一河湖三角洲沉积为主,属于安边三角洲体系向南部延伸部分。通过对研究区长8、长9段取芯井段进行岩心观察描述并结合录井、测井以及岩相、实验分析资料进行综合分析,查明了沉积微相类型,确定研究区长8、长9段主要发育湖泊-三角洲沉积体系,以三角洲前缘亚相最为典型。由于本区构造运动微弱,沉积微相控制下的砂体展布特征对研究油气聚集与分布就显得尤为重要,因此,沉积相的正确划分可为寻找有利储集体指明方向。

The Hujianshan Area is dominated by fluvial and lacustrine--fluviolacustrine delta sediments in Yanchang Formation,which locates in the south extensional of delta system of Anbian. The types of sedimentary facies were identificated through core observation and description, data of log, lithology, and experimental analysis in Chang8--9 of study area. Confirm that lacustrine--delta depositional system is largely developed, and delta front subfacies is predominance. Due to the weaker tectonic movement in study area, distribution of sand controlled by sedimentary microfacies is very important to distribution and enrichment of hydrocarbon. Therefore, the favor reservoir can be indicated by correct subdivision of sedi- mentary facies.