对鄂尔多斯盆地延川南地区上古生界地层、构造、演化等进行了分析，重点研究了上古生界致密砂岩储层特征、生储盖组合、圈闭特征、气藏特征，最后总结了气藏富集规律和指明下步有利勘探目标区。本区发育山西组、太原组煤层和暗色泥岩两套有利烃源岩。山西组和下石盒子组河道砂体发育，主要呈北西向展布，形成山西组自生自储和下石盒子组下生上储两套生储盖组合。气藏展布受砂体分布控制，总体向西部、深部含气性变好。山二段Y6井区和Y20井区、盒八段底块砂岩Y3p1井区和Y14井、盒六段主力砂体Y3井区和Y3p3井区是下步有利勘探目标区。%This paper analyzed the features such as the formation, the structure and the evolution of the Upper Paleozoic in South Yanchuan area of Ordos basin, focused on the reservoir characteristics, the source-reservoir-seal assemblage, the trap characteris-tics and the gas reservoir characteristics of the Upper Paleozoic and finally summarized the gas reservoir enrichment rules and indi-cated the further favorable exploration target area. This area developed coal bed and dark mudstone these two hydrocarbon source rocks of Shanxi formation and Taiyuan formation. Developed channel sand bodies in Shanxi formation and lower Shihezi formation, which primarily lay in north-west, form two sets of source-reservoir-seal assemblage that are self-generation and self-accumula-tion in Shanxi formation and bottom generation and top accumulation in lower Shihezi formation. The gas reservoir distribution mainly controlled by the sand body distribution is with better gas content in the west and deep place. The further favorable explora-tion target areas are well block Y6 and well block Y20 of lower Shanxi formation, well block Y3p1 and well block Y14 of the 8th member of lower Shihezi bottom sand formation, well block Y3 and well block Y3p3 of the 6th member of lower Shihezi formation.
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