Tectonic features, genetic mechanisms and basin evolution of the eastern Doseo Basin, Chad

被引：0

作者：

Gao H. ^{[1
]}

Du Y. ^{[2
]}

Wang L. ^{[1
]}

Gao S. ^{[1
]}

Hu J. ^{[1
]}

Bai J. ^{[3
]}

Ma H. ^{[1
]}

Wang Y. ^{[1
]}

Zhang X. ^{[2
]}

Liu H. ^{[4
]}

机构：

[1] China National Oil and Gas Exploration and Development Corporation, Beijing

[2] Research Institute of Petroleum Exploration and Development, PetroChina, Beijing

[3] Exploration and Development Research Institute of PetroChina Yumen Oilfield Company, Jiuquan

[4] Research Institute of Bureau of Geophysical Prospecting Inc., CNPC, Zhuozhou

来源：

Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development | 2023年 / 50卷 / 05期

关键词：

basin evolution; Cretaceous; Doseo Basin; genetic mechanism; strike-slip fault; tectonic inversion; unconformity;

D O I：

10.11698/PED.20220822

中图分类号：

学科分类号：

摘要：

The features of the unconformity, fault and tectonic inversion in the eastern Doseo Basin, Chad, were analyzed, and the genetic mechanisms and basin evolution were discussed using seismic and drilling data. The following results are obtained. First, four stratigraphic unconformities, i.e. basement (Tg), Mangara Group (T10), lower Upper Cretaceous (T5) and Cretaceous (T4), four faulting stages, i.e. Barremian extensional faults, Aptian–Coniacian strike-slip faults, Campanian strike-slip faults, and Eocene strike-slip faults, and two tectonic inversions, i.e. Santonian and end of Cretaceous, were developed in the Doseo Basin. Second, the Doseo Basin was an early failed intracontinental passive rift basin transformed by the strike-slip movement and tectonic inversion. The initial rifting between the African and South American plates induced the nearly N-S stretching of the Doseo Basin, giving rise to the formation of the embryonic Doseo rift basin. The nearly E-W strike-slip movement of Borogop (F1) in the western section of the Central African Shear Zone resulted in the gradual cease of the near north-south rifting and long-term strike-slip transformation, forming a dextral transtension fault system with inherited activity but gradually weakened in intensity (interrupted by two tectonic inversions). This fault system was composed of the main shear (F1), R-type shear (F2-F3) and P-type shear (F4-F5) faults, with the strike-slip associated faults as branches. The strike-slip movements of F1 in Cretaceous and Eocene were controlled by the dextral shear opening of the equatorial south Atlantic and rapid expanding of the Indian Ocean, respectively. The combined function of the strike-slip movement of F1 and the convergence between Africa and Eurasia made the Doseo Basin underwent the Santonian dextral transpressional inversion characterized by intensive folding deformation leading to the echelon NE-SW and NNE-SSW nose-shaped uplifts and unconformity (T5) on high parts of the uplifts. The convergence between Africa and Eurasia caused the intensive tectonic inversion of Doseo Basin at the end of Cretaceous manifesting as intensive uplift, denudation and folding deformation, forming the regional unconformity (T4) and superposing a nearly E-W structural configuration on the Santonian structures. Third, the Doseo Basin experienced four evolutional stages with the features of short rifting and long depression, i.e. Barremian rifting, Aptian rifting–depression transition, Albian–Late Cretaceous depression, and Cenozoic extinction, under the control of the tectonic movements between Africa and its peripheral plates. © 2023 Science Press. All rights reserved.

引用

页码：1003 / 1015

页数：12

共 36 条

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