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

Petroleum Exploration and Development 2023年第5期50卷 1151-1166页

作者： GAO Huahua DU Yebo WANG Lin GAO Simin HU Jie BAI Jianfeng MA Hong WANG Yuhua ZHANG Xinshun LIU Hao China National Oil and Gas Exploration and Development Corporation Beijing 100034China Research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China Exploration and Development Research Institute of PetroChina Yumen Oilfield Company Jiuquan 735019China Research Institute of Bureau of Geophysical Prospecting Inc. CNPCZhuozhou 072751China

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.***.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

关键词： doseo basin Cretaceous unconformity strike-slip fault tectonic inversion genetic mechanism basin evolution

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Exploration discovery and hydrocarbon accumulation characteristics of the doseo strike-slip and inverted basin, Chad

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Petroleum Exploration and Development 2022年第2期49卷 247-256页

作者： DOU Lirong XIAO Kunye DU Yebo WANG Li ZHANG Xinshun CHENG Dingsheng HU Ying Research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China China National Oil and Gas Exploration and Development Corporation Beijing 100034China

Several international oil companies had conducted petroleum exploration, but failed to make any commercially viable discoveries in the doseo basin for over 30 years. In this article, an integrated analysis, based on the latest seismic and drilling data combined with exploration practice and tectonic, sedimentary as well as petroleum-geological characteristics of the basin, has been conducted with the aim to disclose the key factors of hydrocarbon accumulation and enrichment and then to find the potential petroleum plays. The doseo basin in Chad is a Meso-Cenozoic lacustrine rift basin developed on the Precambrian crystalline basement in the Central African Shear Zone. It is a half graben rift controlled by the strike-slip fault at the northern boundary, and can be divided into two sub-basins, an uplift and a slope. The basin experienced two rifting periods in the Cretaceous and was strongly inverted with the erosion thickness of 800–1000 m during the Eocene, and then entered the depression and extinction period. Structurally, a large number of normal faults and strike-slip faults are identified in the basin, and the boundary faults are inverted faults with normal at first. The main structural styles include inverted anticlines, fault noses, complex fault-blocks and flower structures. The Lower Cretaceous is the main sedimentary strata, which are divided into the Mangara Group, Kedeni, Doba and Koumra Formations from bottom to up. Two transgressive-regressive cycles developed in the Lower Cretaceous indicates with mainly lacustrine, fluvial, delta, braided-delta, fan-delta sandstone and mudstone. The effective source rock in the basin is the deep-lacustrine mudstone of the Lower Cretaceous containing the type Ⅰ and type Ⅱ;organic matters. Furthermore, Inverted anticlines and fault-complicated blocks comprise the main trap types and the Kedeni Uplift is the most favorable play, followed by the Northern Steep Slope and Southern Gentle Slope. Lateral sealing capacity of faults controls the hydrocarbon abundance.

关键词： doseo basin rift basin strike-slip inverted structure petroleum system hydrocarbon accumulation characteristics exploration discovery

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