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下二叠统山西组为鄂尔多斯盆地东部地区天然气勘探的主要目的层,在综合前人研究的基础上,对鄂尔多斯盆地陕北地区山西组区域地质背景、沉积类型、沉积体系及砂体展布特征进行分析,识别出山西组山1山2段发育海陆过渡环境的三角洲沉积体系,研究区主要发育三角洲前缘沉积亚相,包括水下分流河道、分流间湾、间湾沼泽沉积微相,其水下分流河道砂体是研究区天然气储集的骨架砂体。
The Lower Permian Shanxi Formation is the main target for natural gas exploration in the eastern Ordos Basin. Based on the previous studies, the authors analyzed the geological background, sedimentary types, sedimentary system and distribution of sand bodies in the Shanxi Formation in the northern Ordos Basin. The delta depositional system of the transitional environment of sea-land transition is identified in Block 2 of Shan 1, Shanxi. The sedimentary facies of delta front is mainly developed in the study area, including sedimentary microfacies of underwater distributary channel, inter-bay and inter-bay swamp. The underwater distributary channel sand body is the skeleton sand body of natural gas reservoir in the study area.