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蒙古林油田阿尔善组砾岩储层，为富含火山岩屑的特殊类型储层，可分为复成分砾岩、凝灰质砾岩及火山角砾岩三大类。具低成分成熟度和低结构成熟度特点，以粗杂基支撑的砾岩含油物性最好，主要储集空间为粒间基质溶蚀孔隙，为中孔细喉低渗型储层。复成分砾岩以粒间溶蚀孔隙为主，渗透性较好；凝灰质砾岩和火山角砾岩分别以组分内孔隙和残余粒间孔隙为主，渗透性均较差。
The Arxan conglomerate reservoir in the Mongolian Oilfield is a special type of reservoirs rich in volcanic debris. It can be divided into three types: complex conglomerate, tuff conglomerate and volcanic breccia. With low component maturity and low structural maturity, conglomerate with coarse heterozygote is the best oil-bearing property. The main reservoir space is the intergranular matrix dissolved pores, which is a medium-porosity, thin-throat and low-permeability reservoir. Intergranular conglomerate is dominated by intergranular dissolved pores with good permeability; tuffaceous conglomerate and volcanic breccia are mainly composed of intra-component pores and residual intergranular pores, respectively, with poor permeability.