In order to study diagenetic characteristics of Maihanhada Formation in the study area with two measured sections of Hangwula and Maihanhada as examples,the authors employed such means as thin section identification, cathode luminescence, X-ray diffraction analysis, inclusions temperature testing and scanning electron microscope in combination with the data of organic geochemistry. The study result shows that the main sandstone in this area is feldspar sandstone-lithic sandstone. The diagenetic characteristics of Maihanhada Formation show that this set of sandstones is at the early stage of the middle diagenetic period. The early diagenetic compaction was the major effective factor leading to the wreckage around the original pores,whereas the dissolution was one of the significant factors for the formation of the secondary pores and improved the reservoir property to a certain extent.%为研究工作区埋汗哈达组储层砂岩的成岩作用特征,以额济纳旗地区东南部杭乌拉和埋汗哈达2条实测剖面为例,根据薄片、阴极发光、X衍射、包裹体测温、扫描电镜等资料,并结合有机地球化学测试资料进行了综合分析.结果表明,该区埋汗哈达组储层砂岩主要成岩作用有压实作用、胶结作用和溶蚀作用,成岩阶段处于中成岩A期;早期的压实作用和胶结作用是使原生孔隙遭受破坏的主要成岩作用,后期的溶蚀作用是形成次生孔隙的重要因素,溶蚀作用在一定程度上改善了储层物性,对油气成藏具有重要意义.
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