鄂尔多斯盆地二叠纪气候特征及其对东北部砂体的影响

通过对鄂尔多斯盆地东北部二叠纪陆相沉积特征和地球化学特征的研究,结合前人的古植物群落研究成果,认为研究区二叠纪存在从山西期湿热气候向石千峰期干热气候转变的过程。造成气候变化的原因与鄂尔多斯盆地当时所处的古纬度、区域构造运动和区域上大规模火山活动有关。气候变化过程控制和影响了该期的沉积特征,造成了山西组-石千峰组在岩石颜色、岩性组合、砂岩的结构和成分成熟度以及砂体展布特征方面的差异。

Climatic evolution and effects on the sandstone development in northeastern Ordos Basin during the Permian

There once occurred the transition in the Ordos Basin from the humid climates during the Shanxian to the arid climates Basin during the Shiqianfengian of the Permian. These variations in climates may be caused by the palaeogeographic position, tectonic movement and volcanic activity in the basin during the Permian. The humid climates during the Shanxian apparently facilitated the occurrence of the sandstones in larger scales and thickness, and thus contributed to the accumulation of the gas reservoirs during this period.