柴达木盆地西部阿拉尔断裂新生代构造变形特征及意义

doi:10.11720/wtyht.2021.0091

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Abstract

Based on 2D and 3D seismic data, this study analyzes the geometric characteristics,horizontal shortening,and active time of the Alar fault in the southwestern Qaidam Basin in detail and explores the kinematic characteristics,formation mechanisms,and significance for hydrocarbon accumulation during the whole Cenozoic.The results are as follows.The Alar fault can be divided into the western segment in NWW trending and the eastern segment in nearly NS trending,which are nearly vertical. As shown in sections,the western segment inclines southward with a relatively small dip angle,while the eastern segment inclines westward with an almost vertical section.The Alar fault has been active since the Early Cenozoic.The activities of the western segment are dominated by thrust,with horizontal shortening and vertical uplift both exceeding 3 km and strike-slip motion for about 1 km.The activities in the eastern segment are dominated by dextral strike-slip motion,with horizontal shortening and vertical uplift of about 1 km and strike-slip motion of up to 3 km.The formation and activities of the Alar fault are jointly affected by the northward compression imposed by the Qimantage orogenic belt to the south and the Altun left-literal strike-slip fault to the west.There is a close spatial-temporal matching relationship between the fault activities and the formation of oil and gas in the southwestern Qaidam Basin.Therefore,the fault activities are of great significance for the formation of oil reservoirs.

Key words： Qaidam Basin southwest Qaidam Basin Alar fault deformation characteristics

Received: 23 February 2021 Published: 15 December 2021

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	Articles by authors
	Yan-Yan WEI
	Lei WU
	Dao-Qing ZHOU
	An-Cheng XIAO
	Kai HUANG

Cite this article:

Yan-Yan WEI,Lei WU,Dao-Qing ZHOU, et al. Cenozoic tectonic deformation characteristics of Alar fault in southwestern Qaidam Basin and their significance[J]. Geophysical and Geochemical Exploration, 2021, 45(5): 1171-1178.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.0091 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I5/1171

Location and geological survey of the study area
a—geological map of the SW Qaidam Basin and adjacent area;b—gigital elevation map (DEM) of the Qaidam basin and surrounding area;c—fault system of Alar area

The Cenozoic integrated stratigraphy of Qaidam Basin

Seismic profiles crossing the Alar fault and their geological interpretation

Location and total Cenozoic shortening of seismic sections
a—location and number of seismic sections perpendicular to the Alar fault strike;b—total Cenozoic shortening of seismic sections along the Alar fault

Fault effect caused by oblique fault
a、b—if the fault strike is inconsistent with formation strike, then when the marker layers or structural lines on both sides of the fault are projected onto a certain surface, they will show horizontal shift, giving the illusion of left-lateral strike-slip or right-lateral strike-slip on the plane;c—if the fault strike is inconsistent with formation strike, then there is no visual error when the break point is projected onto the same plane

Sketch map showing the kinematics of the Alar fault
a—early Cenozoic;b—late Cenozoic

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