【摘要】 以野外地质构造调查为基础,结合克拉玛依-额敏人工地震勘探结果的地质解释,讨论了准噶尔盆地西北缘盆山耦合结构的基本模式:在剖面上是一个大型化、复杂化的逆冲双重构造体系;在平面上提出了北东向构造带分段标志,并以此为依据,将西北缘克拉玛依逆掩断裂带传统的3大段,进一步划分为12个亚段。对各构造段进行的岩性沉积和构造活动对比结果表明,西北缘沉积盖层中不同时代的岩层厚度具有明显的分段性,西北缘造山带前缘逆掩断裂带构造活动的分段性具有双重含义,即空间上的分段性与时间上的分段性,这种分段性的差异不仅体现在3个大的构造段之间,而且组成各大段的各个亚段之间其沉积特征与活动强度亦有所不同。最后,讨论了西北缘盆山耦合模式与油气田的关系,提出了北西向横断层与北东向"第3排"构造在油气远景预测中的重要意义。更多还原

【Abstract】 Based on the field survey and combined with the results interpreted from the artificial seismic exploration along the line between Karamay and Emin, the basic structural model of basin-range coupling along the northwestern margin of Junggar basin is discussed, showing that in section, it is a large double-thrust system with great complexity; in plane, this NE-trending structural zone is separated into 3 segments and 12 sub-segments by the segmentation indications proposed in this paper. The comparison between sedimentation and tectonic feature for different segments suggests that the thickness of sediment layers varies greatly in the sedimentary cap rocks; the tectonic segmentation of front thrust belt behaves both in time and in space, which exhibits not only in 3 segments, but also in 12 sub-segments. Finally, the relation between the oil-gas fields and the basin-range coupling structural model is discussed, pointing out that NW-trending cross fault and the 3rd NE-trending structural belt are of important significance in oil-gas potential prediction in this area.更多还原