在岩心描述的基础上，通过对薄片观察、阴极发光、扫描电镜、X射线衍射等分析化验资料的研究，对巴彦浩特盆地石炭系储层的岩性特征、成岩作用和成岩演化历史进行了探讨,认为该盆地石炭系存在砂岩和碳酸盐岩2类储集层，砂岩储集层在经历了机械压实和早期胶结（丧失大部分原生孔隙）→溶解（形成次生孔隙或扩大残余原始粒间孔）→晚期再胶结（丧失部分次生孔隙和残余原始粒间孔）→含铁矿物的褐铁矿化（进一步丧失孔隙和残余原始粒间孔）→残余原始粒间孔、晶间孔、溶蚀孔、微孔隙和微裂隙（现存孔隙）成岩和孔隙演化后处于早成岩B期和晚成岩A、B期，其以次生溶蚀孔隙为主，孔隙类型复杂，物性普遍较差，但差中有好;碳酸盐泥经历了2种成岩演化：一是机械压实、胶结作用形成泥、粉晶生物碎屑灰岩，再经溶解、胶结、重结晶作用，使之局部白云岩化；二是机械压实、胶结作用形成含陆源碎屑、内碎屑、生物碎屑、泥—粉晶颗粒灰岩，再经溶解、胶结、重结晶作用，使之局部白云岩化,之后处于浅—中埋藏阶段和深埋藏阶段，其孔隙普遍较少，物性差，个别层段发育溶洞。

The reservoir characteristics, diagenesis and diagenetic evolvement history of Carboniferous in Bayehot Basin were discussed on the basis of core description and the study of thin section analysis, cathodeluminescence, SEM and X-diffraction. There were two types of reservoir in the basin and they were sandstone and carbonate reservoirs. After experiencing mechanical compaction + early cement (most primary pores were lost)→dissolution (secondary pores or enlarged residual primary intergranular pores were formed)→late recementing (partial secondary pores and residual primary intergranular pores were lost) →ferritization of iron\|bearing mineral (pores and residual primary intergranular pores were further lost) →diagenesis of residual primary intergranular pores, intercrystal pores, dissolution pores, micropore and microcrack (present pore) and pore evolvement, the sandstone reservoir was under the phase of early diagenesis B and late diagenesis A and B. The pore type was complex and dominated by secondary dissolution pores. The reservoir property was generally bad, but some good reservoirs still existed. The carbonate mud was under the phase of shallow\|middle burial and deep burial, and had generally a little amount of pores, bad property, and limestone caves developed in individual intervals after it suffered two types of diagenetic evolution: (1) The mechanical compaction and cementation formed micrite\|crystal bioclastic limestone, and local dolomitized by dissolution, cement and recrystallization; (2) The mechanical compaction and cementation formed grainstone contained terrigenous clast, intraclast, bioclast and micrite-crystal, and local dolomitized.