通过铸体薄片、扫描电镜和压汞分析，以及依据油藏所处的构造形态、储层成因类型、油藏成藏要素等对油藏进行解剖分析，探讨鄂尔多斯盆地吴起地区长2油层组侵蚀残余地层油藏的控制因素。吴起地区长2油层组储层砂体孔隙类型主要为剩余原生粒间孔和次生溶孔，孔隙结构分选中等；发育上倾尖灭型、透镜体型、小幅背斜构造型和复合成因型4种油藏类型。鄂尔多斯盆地延长组侵蚀残余地层油藏成藏受古地貌、岩性和构造等多重因素的控制，油藏主要分布于古河道两侧的斜坡带上。地层完整的长2油层组内，小幅背斜构造与分流河道砂体叠置，形成规模较大的构造-岩性复合成因油藏，是吴起地区长2油层组主要的油藏类型。
This paper analyses the casting thin sections,scanning electron microscope and mercury injection.The result shows that the rock types of the Chang 2 (Member 2 of Triassic Yanchang Formation)oil reservoir group in the Wuqi area of Ordos Basin are mainly the fine-grain feldspathic lithic sandstone and lithic arkose,the types of reservoir space are mainly the residual original intergranular pores and the secondary solution pores,and the sorting reservoir pore structure is medium.Based on the detailed analysis of the reservoir structure in paleogeomorphology,the genetic types of the reservoir,and the reservoir accumulation elements,etc.,4 types of oil reservoirs,that is,the updip pinch-out type,the lens shape,the small anticline structure type and the compound genesis type,develop in the Chang 2 oil layer group of the Wuqi area.It can be concluded that the Yanchang Formation erosion residual geomorphology reservoir in Ordos Basin is controlled by multiple factors,such as,geomorphology,lithology and structure.The reservoir is mainly distributed over the
river on both sides of the slope.In the Chang 2 oil layer group with complete formation,the anticline structure is slightly superimposed on the distributary channel sandstone.There develop a larger composite genetic oil pool of structure and lithology.It is the main oil pool type in the Chang 2 oil layer group of the Wuqi area.
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