塔北隆起-库车坳陷西段差异构造变形特征及其控制因素

发布时间：2018-06-18 00:49

本文选题：生长地层 + 构造变形特征　；参考：《地质通报》2017年04期

【摘要】：塔北隆起-库车坳陷是塔里木盆地重要的油气富集区,探讨区域构造特征及主要控制因素对油气勘探具有重要意义。利用地球物理资料,应用生长地层及应力学分析方法对研究区地震剖面进行解释与复原,并对区域内主要新生界生长构造发育的时序进行界定。研究结果表明,区内东西段构造挤压时间及变形特征存在明显差异。新生界挤压构造发育时间自东向西由早到晚,沿古近系滑脱面,新生界构造变形自北部向盆内传播的距离差别显著:西段传播距离较远,东段较近;西部滑脱构造发育,冲断构造较少,中、东部相反,新生界构造变形局限于库车坳陷内。通过综合对比分析,造山带挤压背景下区域内古应力场在古近纪后发生明显的逆时针压扭,古近系膏泥岩层为构造变形向盆内传播提供了重要条件,大型冲断构造的发育及坳隆转换带基底的挠曲有效地释放分解了来自北部的挤压作用,这是区内构造特征东西差异的主要原因。
[Abstract]:Tarim uplift-Kuqa depression is an important oil and gas accumulation area in Tarim Basin. It is of great significance to explore regional structural characteristics and main controlling factors for oil and gas exploration. Based on the geophysical data, the seismic profiles in the study area are interpreted and restored by the method of growth stratigraphy and anisotropic analysis, and the time series of the growth and development of the main Cenozoic structures in the study area are defined. The results show that there are obvious differences in tectonic extrusion time and deformation characteristics between the east and west segments. The Cenozoic compressional structure developed from east to west from early to late. Along the slip surface of Paleogene, the distance of Cenozoic tectonic deformation propagating from the north to the basin was significant: the west segment spread far, the east segment was near, and the western slip structure developed. There are few thrust structures, but on the contrary in the middle and east, the tectonic deformation of the Cenozoic is confined to Kuqa depression. Through comprehensive comparison and analysis, the paleo-stress field in the area occurred obviously counterclockwise compression and torsion after Paleogene, and the Paleogene gypsum mudstone layer provided important conditions for tectonic deformation to propagate into the basin. The development of large thrust structures and the release of deflections from the basement of the transfer belt of the depression effectively decompose the compressions from the north, which is the main reason for the differences of the structural characteristics between the east and the west in the region.
【作者单位】：中国石油勘探开发研究院;中国地质大学(北京)能源学院;
【基金】：国家科技重大专项《全球油气资源评价与选区选带研究》(编号:2016ZX05029)
【分类号】：P618.130.2

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