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鄂尔多斯盆地存在前缘坳陷和大型斜坡组成的深盆地结构。上古生界发育海陆交互相和陆相砂泥岩生储组合，大型三角洲体系形成了广泛发育的致密砂岩储集层。煤系地层形成了深盆气藏的主要气源岩，范围广、丰度高的煤系有机质除东北部处于低成熟外，盆地中普遍进入成熟─高成熟演化阶段。深盆气的生成─运移─聚集从三叠纪持续到晚白垩世，其后进入保存期。上古生界形成了一个几乎覆盖全区的特大型深盆气藏，地层压力以异常低压为主，气水分布明显呈现南气北水下气上水的特征，气层分布不受构造控制，预测地质储量为１． ４７ × １０１２～ １０． ５ × １０１２ｍ３。
The Ordos Basin is characterized by deep basin structure with frontal depression and large slope. The Upper Paleozoic develops the marine-continental interaction facies and terrestrial sandstone shale reservoirs, and the large delta system has formed a well-developed tight sandstone reservoir. The coal-bearing strata form the main gas source rocks of the deep-basin gas reservoirs. The coal-rich organic matter of a wide range and high abundance is generally mature and mature at the mature stage except for the northeastern part of the coal-bearing strata. Deep basin gas generation-migration-accumulation continued from the Triassic to the Late Cretaceous, and then entered the shelf life. The Upper Paleozoic formed a very large deep-basin gas reservoir covering almost all of the region. The formation pressure was dominated by abnormal low pressure. The gas-water distribution obviously showed the characteristics of subaqueous gas from the south to the north, and the gas distribution was not controlled by tectonics. Forecast geological reserves of 1. 47 × 1012 ~ 10. 5 × 1012m3.