塔里木盆地巴楚—麦盖提地区古构造研究

Palaeotectonic analysis in Bachu?鄄Markit Area, Tarim Basin

吴礼明 丁文龙 赵松 曾维特 游声刚

中国地质大学（北京）能源学院，北京 100083

School of Energy Resources, China University of Geosciences, Beijing 100083, China

随着塔里木盆地巴楚—麦盖提地区（巴—麦地区）油气勘探的深入，古构造演化研究对指导该地区油气勘探起着越来越重要的作用。以现今构造为基础，采用逐层回剥和平衡剖面原理恢复地层剥蚀厚度和古埋深，同时考虑压实校正影响来分析巴楚—麦盖提地区古构造演化。结果表明，巴楚—麦盖提地区自震旦纪以来，经历了加里东构造旋回、海西构造旋回、燕山构造旋回和喜马拉雅构造旋回等多期构造运动，构造格局发生多次调整。具体表现为：加里东期早期—中期，巴—麦地区为“北东低，西南高”构造格局；加里东晚期，调整为“北高，南低”的构造格局；海西期，巴楚地区为“北高，南低”，麦盖提地区则为“南高，北低”的构造格局；喜山期，麦盖提地区翘倾，正式转变为斜坡，同时巴楚地区隆升更为强烈，形成了“巴楚隆起，麦盖提斜坡”的现今构造格局。

The research of palaeotectonic evolution plays a significant role in the oil and gas exploration in Bachu-Markit Area, Tarim Basin. On the basis of current tectonic, the paleoburial depth of the strata and the erosion thickness of strata are restored and used to analyze the palaeotectonic evolution in Bachu?-Markit Area according to the principle of backstripping analysis and balanced cross section. The result shows that Bachu-Markit Area has experienced the Caledonian tectonic cycle, the Hercynian tectonic cycle, the Yanshan tectonic cycle and the Himalayan tectonic cycle since the Sinian, but the tectonic framework has been changed many times. In the early Caledonian and mid-Caledonian, the tectonic framework of Bachu-Markit Area appeared high in the northeast and low in the southwest. In the late Caledonian, the structural framework changed to be high in the north and low in the south. In the Hercynian, the tectonic framework of Bachu Area was high in the north and low in the south, but the Markit Area displayed high in the south and low in the north. In the Himalayan, the Markit Area began to tilt and turned into the slope. In addition, the Bachu Area uplifted more intensely, forming the current tectonic framework of Bachu uplift and Markit slope.

10.6056/dkyqt201201002