Salt-related structural characteristics and deformation mechanism of the Zhongqiu-Dongqiu section of the Qiulitag structural belt, Tarim Basin
Received date: 2020-12-27
Revised date: 2021-03-02
Online published: 2021-07-22
Supported by
The National Key Research and Development Program of China(2019YFC0605505)
Thick layers of gypsum rocks are widely developed in the Neogene and Paleogene of the Zhongqiu-Dongqiu section of the Qiulitag structural belt, Tarim Basin. However, due to the differences in the distribution of the salts, there are different structural styles and deformation mechanisms in the lower salt layer and upper salt layer of the Zhongqiu and Dongqiu, respectively. Based on the interpretation of 2D and 3D seismic data and the theoretical basis of the former continental basin system, a detailed analysis of the structural style of the Zhongqiu-Dongqiu section was carried out. Through detailed seismic interpretation, well-drilling, distribution of gypsum layer analysis, it is considered that the Zhongqiu section is located in the intersection and superposition area of the gypsum salt rock of Qomglemu Group and the gypsum salt rock of the Jidike Formation, with slippage and thrust imbricated structure developed under salt and recoil structure developed above salt. In the Dongqiu, the gypsum salt rock of the Jidike Formation is developed, and the large wide and slow anticline is developed under salt, and the slippage and thrust structure are developed in the upper salt layer, forming monocline or fault anticline. By means of discrete element numerical simulation and single factor variable method, through four groups of comparative simulation experiments, the mechanism of salt tectonic deformations in Zhongqiu and Dongqiu were discussed. Discrete element numerical simulation results show that the distribution of salt rock, syntectonic deposition and basement preexisting fault are the controlling factors of salt tectonic deformation in the Zhongqiu-Dongqiu Period. The distribution and superposition of salt layer significantly affect the tectonic deformation under salt layer. Multiple rows of thrust faults are formed in the developed area of salt layer. Syntectonic deposition weakens the tectonic deformation intensity under salt and has certain influence on the tectonic morphology. Preexisting faults mainly affect the tectonic style under salt and the vertical uplift amplitude of the extrusion end.
Yun-jiang DUAN , Hao-yu LUO , Hui-wen XIE , Zhen-ping XU , Xue-qi ZHANG , Jing-zhou ZHANG , Lei SHI , Rui YUAN . Salt-related structural characteristics and deformation mechanism of the Zhongqiu-Dongqiu section of the Qiulitag structural belt, Tarim Basin[J]. Natural Gas Geoscience, 2021 , 32(7) : 993 -1008 . DOI: 10.11764/j.issn.1672-1926.2021.03.009
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