Based on the summary of previous research results,logging data and core data are used for laboratory description and thin section analysis and the distribution pattern of sedimentary sand body and sedimentary microfacies in He8 zone in Shanxi formation and lower Shihezi formation in west Linfen area are deeply and systematically investigated,using sedimentology and petroleum geology as theoretical guidance.It is determined that braided river delta -lacustrine facies is the dominant facies developed in He8 zone in Shanxi formation and lower Shihezi formation in the research area and it's divided into three subfacies and 8 microfacies,among which delta front subfacies is the dominant sedimentary body.Permeability and gas testing result in Shan2 zone are significantly higher than that in Shan1 zone and he8 zone.Reservoir properties of underwater distributary channel subfacies are better than that of channel mouth bar subfacies.The underwater distributary channel subfacies in Shan2 zone in the research area is the most favorable facies for further oil and gas development.This research provides guidance for optimization of favorable exploration area for tight sandstone gas reservoirs in Linfen.%以沉积学和石油地质学为理论指导,在总结前人研究成果基础之上,结合测井资料和钻井取心资料,进行室内描述和薄片分析,深入系统地研究了临汾西部地区山西组和下石盒子组盒8段的沉积砂体与沉积微相展布特征研究认为:研究区山西组和下石盒子组盒8段主要发育辫状河三角洲—湖泊沉积相,并细分为3个亚相8个微相,三角洲前缘亚相是沉积主体;山2段的渗透率和试气效果明显高于山1段和盒8段;水下分流河道微相的储集物性好于河口砂坝微相.研究区山2段水下分流河道微相是下步油气开发的最有利相带.该研究为临汾致密砂岩气藏有利探区的优选提供了一定的指导作用.
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