对胡尖山地区长 4+5 油层组的岩心、测井、铸体薄片、扫描电镜、物性和压汞等资料的分析表明：该区岩石类型主要为岩屑长石砂岩和长石砂岩；孔隙类型主要为粒间孔和长石溶孔；储层孔隙度为 10.86%，渗透率为 0.56 mD，为低孔、特低渗、致密—近致密储层。 该区成岩作用主要包括压实作用、胶结作用和溶蚀作用，其中绿泥石膜对原生粒间孔的保存以及溶蚀作用对储层的孔渗性均具有建设性作用。 以储层特征参数和孔隙结构参数为基础，对胡尖山地区长 4+5 油层组储层进行了分类评价，并将其分为 4 类，其中Ⅱ类和Ⅲ类储层是该区主要的储集层类型。

Based on the analysis of cores, logging, thin sections, scanning electronic microscope, physical properties and mercury injection, this paper discussed the characteristics of sedimentary facies, petrologic features, pore types, physical properties, diagenesis and effects on reservoir. The result shows that the Chang 4+5 oil reservoir set in Hujianshan area is mainly made up of debris-feldspar sandstone and feldspar sandstone, and the main pore types are primary intergranular pore and feldspar dissolved pores. The porosity of the reservoir is 10.86%, and the permeability is 0.56 mD. The reservoir belongs to low porosity, ultra-low permeability reservoir and tight reservoir. The diageneses contain compaction, cementation and dissolution, and the protection from chlorite membrane to primary intergranular pores and dissolution are very constructive to the reservoir. Reservoir of Chang 4+5 oil reservoir set in Hujianshan area can be divided into four types, and typeⅡand type Ⅲ are the main reservoirs.