中文摘要：

鄂尔多斯盆地上古生界具有“满盆生气、到处含气、岩性控气”的特点。通过东、西部气藏的对比研究认为：煤系地层广覆式生烃、浅水三角洲大面积聚砂和湖侵作用铸造区域性盖层三大因素为形成大面积岩性一地层气藏奠定了基础。东部以原生孔为主的山2段、太2段相对低孔高渗型储层主要受潮汐和河流共同作用形成的高能聚砂环境控制；西部以溶蚀孔＋原生孔组合为特征的盒8段、山1段相对高孔低渗型储层主要受富石英物源区和建设性成岩作用的控制。提出富石英物源区、毗邻岸线的高能相带和由网状输导体系控制的建设性成岩相区的确定对鄂尔多斯盆地上古生界天然气勘探具有重要意义。

英文摘要：

The Upper Paleozoic of Ordos Basin is characterized by ＂gas-generating in the whole basin, gas-bearing widely and gas controlled by lithology＂. The comparative study between the east and the west gas reservoirs shows that the three factors, including the hydrocarbon generated widely by coal measure strata, sand accumulated broadly by shallow water delta and regional overlying rock founded by lake transgression, are the base to form the blanket lithostratigraphic gas reservoirs. In the east reservoirs, Member 2 of Shanxi Formation and Member 2 of Taiyuan Formation characterized by primary pores and relatively low porosity and high permeability are dominated by energetic environment formed by tide and stream current. In the west reservoirs, Member 8 of Shihezi Formation and Member 1 of Shanxi Formation characterized by dissolution pores and primary pores and relatively high porosity and low permeability are dominated by rich in quartz provenance and constructive diagenesis. Then, the rich in quartz provenance, energetic facies belt and constructive diagenesis are the key elements for the Upper Paleozoic gas exploration.