准噶尔盆地莫索湾凸起西缘走滑断裂分层变形特征及形成机理

doi:10.19657/j.geoscience.1000-8527.2022.035

现代地质 ›› 2023, Vol. 37 ›› Issue (02): 296-306.DOI: 10.19657/j.geoscience.1000-8527.2022.035

准噶尔盆地莫索湾凸起西缘走滑断裂分层变形特征及形成机理

田安琦¹^,²(), 陈石¹^,²(), 余一欣¹^,², 修金磊³, 金峰¹^,²

1.中国石油大学(北京)地球科学学院,北京 102249
2.中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249
3.中国石化胜利油田分公司勘探开发研究院,山东东营 257000

收稿日期:2022-04-02 修回日期:2022-06-20 出版日期:2023-04-10 发布日期:2023-05-23
通讯作者: 陈石
作者简介:陈石,男,副教授,1986年出生,构造地质学专业,从事构造地质学科研与教学工作。Email:chenshi4714@163.com。
田安琦,女,硕士研究生,1995年出生,构造地质学专业,从事构造地质学科研工作。Email:1214879022@qq.com。

Layered Deformation Characteristics, Formation Mechanism of Strike-slip Faults on the Western Margin of Mosuowan Uplift,Junggar Basin

TIAN Anqi¹^,²(), CHEN Shi¹^,²(), YU Yixin¹^,², XIU Jinlei³, JIN Feng¹^,²

1. School of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China
2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
3. Research Institute of Exploration and Development, Shengli Oilfield Company, SINOPEC, Dongying,Shandong 257000, China

Received:2022-04-02 Revised:2022-06-20 Online:2023-04-10 Published:2023-05-23
Contact: CHEN Shi

摘要/Abstract

摘要：

准噶尔盆地莫索湾凸起周缘地区发育大量走滑断裂,变形特征复杂,由于地震资料质量限制,断裂活动时间划分不一,形成机理不明。以莫索湾凸起西缘征沙村地区走滑断裂为研究对象,对征沙村地区走滑断裂的几何学形态及运动学特征展开研究。结果表明:征沙村走滑断裂分层差异变形,主要分为3层。深构造层二叠系发育近SN向和近WE向两组走滑断裂,WE向断裂近SN左行错断,剖面以负花状构造样式为主。中构造层三叠系—侏罗系八道湾组仅发育近WE向断裂,平面上形成马尾状、平形状以及叠接状构造样式,剖面表现正花状构造样式。浅构造层侏罗系三工河组断裂走向为近WE向,平面上呈线性展布,剖面以挠曲变形为主。3构造层断裂叠合发育,形成直立线状、Y形以及花状构造样式,其中近SN向断裂发生右行走滑,近WE向断裂发生左行走滑。将征沙村断裂演化期次分为3期:晚二叠世准噶尔地块逆时针旋转,形成近SN向走滑断裂,表现为负花状构造;早侏罗世天山NE—SW向挤压应力形成近WE向走滑断裂,表现为正花状构造;晚侏罗世极少数近WE向断裂继承发育。

关键词: 准噶尔盆地, 走滑断裂, 活动期次, 分层变形, 形成机理

Abstract:

Many strike-slip faults are developed around the Mosuowan uplift in Junggar basin, with complex deformation characteristics. Due to the limit seismic data quality, the time division of fault activity is different, with the formation mechanism unknown. Taking the Zhengshacun area on the western margin of Mosuowan uplift as an example, we studied the geometric morphology and kinematic characteristics of strike-slip faults at Zhengshacun. The results show that the strike-slip faults at Zhengshacun have layered differential deformation, which is mainly divided into three layers. The deep structural layer is Permian, which develops two strike-slip fault groups in near N-S and near E-W directions. The E-W-trending faults cut the nearly N-S sinistral faults, and the section is mainly in negative flower structure style. The middle structural layer of Triassic-Jurassic Badaowan Formation only developed near E-W trending faults, forming horsetail, flat and overlapping structural styles on the plane, and the section developed positive flower structure. The fault strike of Jurassic Sangonghe Formation in the shallow structural layer is near E-W directed, which is linearly distributed on the plane, and the section is dominated by flexural deformation. The faults in the three structural layers are superimposed and developed to form vertical linear, Y-shaped and flower-shaped structural styles, in which the near N-S directed faults are dextral strike-slip and the near E-W directed ones are sinistral strike-slip. Evolution of the Zhengshacun fault are divided into three stages. In the Late Permian, the Junggar block rotates counterclockwise to form a near N-S strike-slip fault, showing a negative flower structure. In the early Jurassic, the NE-SW compressive stress of Tianshan formed a near E-W strike-slip fault, showing a positive flower structure. In the Late Jurassic, a few near E-W faults are inherited and developed.

Key words: Junggar basin, strike-slip fault, activity period, delamination deformation, formation mechanism

中图分类号:

P542

田安琦, 陈石, 余一欣, 修金磊, 金峰. 准噶尔盆地莫索湾凸起西缘走滑断裂分层变形特征及形成机理[J]. 现代地质, 2023, 37(02): 296-306.

TIAN Anqi, CHEN Shi, YU Yixin, XIU Jinlei, JIN Feng. Layered Deformation Characteristics, Formation Mechanism of Strike-slip Faults on the Western Margin of Mosuowan Uplift,Junggar Basin[J]. Geoscience, 2023, 37(02): 296-306.

图/表 10

图1 准噶尔盆地征沙村位置示意图(a)、征沙村周缘构造分布图(b)以及征沙村地层系统图(c)(据钱少飞[22]修改)

Fig.1 Location map (a), structural distribution map (b) and stratigraphic column (c) of Zhengshacun in Junggar Basin (modified from Qian[22])

图2 典型地震解释剖面(剖面位置见图1(b))

Fig.2 Typical seismic interpretation profile (for section location seeing Fig.1(b))

图3 准噶尔盆地征沙村地区上二叠统顶面(a)、侏罗系八道湾组底面(b)及三工河组底面(c)断裂系统

Fig.3 Fault system diagram for the top Upper Permian (a), bottom Jurassic Badaowan Formation (b) and bottom Sangonghe Formation (c) at Zhengshacun, Junggar Basin

图4 准噶尔盆地征沙村地区上二叠统顶面(a)、侏罗系八道湾组底面(b)及三工河组底面(c)走滑断裂平面特征

Fig.4 Plane characteristics of strike-slip faults on the top Upper Permian (a), bottom Jurassic Badaowan Formation (b) and bottom Sangonghe Formation (c) at Zhengshacun, Junggar Basin

图5 F1断裂体系解释剖面特征

Fig.5 Characteristics of interpreted F1 fault system profile

图6 F6断裂体系解释剖面特征

Fig.6 Characteristics of interpreted F6 fault system profile

图7 研究区三维地震数据体等时切片 (a)3726 ms振幅切片;(b)3755 ms振幅切片;(c)5410 ms振幅切片

Fig.7 Isochronous slice of 3D seismic data volume in the study area

图8 走滑断层构造模式(修改自Woodcock等[26])

Fig.8 Strike-slip fault structural models (modified from Woodcock et al.[26])

图9 准噶尔盆地征沙村走滑断裂变形解释

Fig.9 Deformation interpretation of Zhengshacun strike-slip fault in the Junggar Basin

图10 准噶尔盆地征沙村走滑断裂演化模式

Fig.10 Evolution model of Zhengshacun strike-slip fault in the Junggar Basin

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准噶尔盆地莫索湾凸起西缘走滑断裂分层变形特征及形成机理

Layered Deformation Characteristics, Formation Mechanism of Strike-slip Faults on the Western Margin of Mosuowan Uplift,Junggar Basin

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