吐哈盆地重力场与断裂构造特征

Characteristics of gravity field and faulted structure in Tuha Basin

申晨¹ 袁炳强¹ 李玉宏² 张春灌¹ 鲁海鸥¹

西安石油大学油气资源学院，陕西 西安 710065 中国地质调查局西安地质调查中心，陕西 西安 710054

College of Oil and Gas Resources, Xi′an Shiyou University, Xi′an 710065, China Xi′an Geological Survey Center, China Geological Survey, Xi′an 710054, China

为了研究吐哈盆地的构造特征，通过系统收集处理研究区已有的重力资料，讨论分析了研究区重力场的特征及成因，推测出了研究区的断裂构造体系。研究区南部布格重力异常近东西向的重力高值带，主要反映了晚古生界的发育特征，中部及北部重力低值带主要由基底凹陷引起。局部重力高、重力低反映局部凸（隆）起与凹陷构造。研究区发育的主要断裂走向为北东向及东西向，它们控制盆地边界及盆地内部发育的主要地层展布。研究区了墩隆起区黄田凸起可进一步划分为2个构造单元，即北西地区凹陷和黄田凸起。吐哈盆地盖层为中、新生界，其中侏罗系厚度最大约为2 000 m。

In order to study the structural characteristics of Tuha Basin, characteristics and causes of gravity field of the study area have been discussed and analyzed, and the faulted structure system has been inferred through collecting and processing the existing gravity survey data of the area. The gravity high belt near west-east trending reflects the development features of Late Paleozoic in the southern part of study area. The gravity low belt is caused by basal depression in middle part and the northern part. Regional gravity high and gravity low reflect the regional uplift and depression structures. Developed faults are mainly north-east trending and west-east trending, which control the basin boundary and the distribution of developed formation within basin. Huangtian bulge of Liaodun uplift region can be further divided into two structural units, namely North-West depression and Huangtian bulge. Cap rock of Tuha Basin is Mesozoic and Cenozoic, in which maximum thickness is about 2,000 m in Jurassic.

10.6056/dkyqt201204010