Differential Deformation and Evolution Characteristics of the No.17 Strike-slip Fault Zone in the Tarim Basin

doi:10.19657/j.geoscience.1000-8527.2022.090

Abstract

Abstract:

The No.17 strike-slip fault zone in Tarim Basin is a large strike-slip fault zone that runs through the transitional zone between the Tazhong Uplift and the Afghani Manchu area.A series of important breakthroughs have been made in oil and gas exploration along this fault zone in recent years.Based on the new 3D seismic data in Fuman oilfield, we analyze the spatial structure and evolution processes of the northern segment of the No.17 strike-slip fault zone, and discuss the relationship between the spatial structure and oil properties.The results show that the No.17 strike-slip fault zone has stratified deformation characteristics in the profile.The fault zone in the Cambrian subsalt structural layer is straight into the basement, a few branch faults are deve-loped in the Middle Cambrian salt structural layer, and the Upper Cambrian-Middle Ordovician carbonate structural layer has strong fault activity and a large deformation range.In the Upper Ordovician-Carboniferous clastic structural layer, normal faults are developed.On plane view, the northern section of the No.17 strike-slip fault zone has variable strike direction, which can be subdivided into the north, middle and south subsections.The north subsection has long linear fault extension, the middle subsection has obvious fault overlapping characteristics, and the south subsection has a braided structure.Under the top surface of Middle Ordovician limestone, the faults are mainly linear extending, while on the top surface of Silurian, they are in an echelon pattern.The No.17 strike-slip fault zone has sinistral strike-slip activity in the Middle Ordovician and Late Ordovician-Carboniferous, and the activity intensity is strong in the north and weak in the south.According to the fault deformation and regional stress field characteristics, the evolution of the fault zone can be divided into the early Caledonian fault initial development stage, the middle Caledonian fault mature stage, and the late Caledonian-Hercynian demise stage.

Key words: No.17 strike-slip fault zone, stratified differential deformation, formation and evolution, Fuman oil field, Tarim Basin

CLC Number:

P618.130.2

WANG Qinghua. Differential Deformation and Evolution Characteristics of the No.17 Strike-slip Fault Zone in the Tarim Basin[J]. Geoscience, 2023, 37(05): 1136-1145.

Figures/Tables 8

Fig.1 Tectonic units and major faults in the transitional zone between the Awati and Manjiaer depressions, Tarim Basin (modified from references [27-28])

Fig.2 Comprehensive stratigraphic column in Fuman area, Tarim Basin (modified from reference [28])

Fig.3 Comparison of profile characteristics of the northern No.17 strike-slip fault zone in the transitional zone between the Awati and Manjiaer depressions (seeing Fig.1 for the profile location)

Fig.4 Plane coherence and interpretation of the northern No.17 strike-slip fault zone

Table 1 Comparison of the development characteristics of each segment and strata of the No.17 strike-slip fault zone

亚段	延伸长度 (km)		最大变形幅度 (m)		最大破碎带宽度 (km)
亚段	中奥陶统顶界面	志留系底界面	中奥陶统顶界面	志留系底界面	中奥陶统顶界面	志留系底界面
北亚段	20.8	7.8	98	87	0.7	10.5
中亚段	20.4	20.6	189	147	1.1	6.4
南亚段	26.1	24.8	47	72	1.9	4.6

Fig.5 Rotation discrimination indicator of the No.17 strike-slip fault zone

Fig.6 Vertical deformation amplitude characteristics of different layers along the No.17 strike-slip fault zone

Fig.7 Evolution models for the No.17 strike-slip fault zone

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