鄂尔多斯盆地中生代构造演化特征及油气分布

TECTONIC EVOLUTION AND OIL-GAS DISTRIBUTOON IN THE MESOZOIC ORDOS BASIN

从地球动力学背景分析了鄂尔多斯盆地中生代构造演化特征,按构造演化序列将中生代盆地演化分为早-中三叠世盆地格架奠定期、晚三叠世盆地生油岩形成期、早-中侏罗世构造稳定期、晚侏罗世生排烃高峰期、早白垩世盆地整体抬升期及晚白垩世盆地消亡期等6个阶段.并指出中生代盆地构造演化各阶段对油气源的形成、油气聚集,以及对油气圈闭成藏等油气分布规律均有不同程度的影响及控制作用.

With an alysis on the geodynamic background for the tectonic evolutionary of the Mesozoic Ordos Basin, according to the tectonic evolution sequence, the Mesozoic basin is divided into six evolving stages, i.e. 1） the establishment of basin framework in Early-Middle Triassic, 2） formation of oil source rock in Late Triassic, 3） tectonically stable period in Early-Middle Jurassic, 4） hydrocarbon expulsion peak period in Late Jurassic, 5） uplifting of the whole basin in Early Cretaceous, and 6） extinction of the basin in Late Cretaceous. Each stage of the tectonic evolution of the basin exerts different influence and control to the forming of oil-gas source, the accumulation of hydrocarbon, the trap of oil and gas, and the distribution of reservoirs.