Tectonic evolution and the controlling effect on hydrocarbon accumulation in strike-slip basin in the Central African Rift system: a case study of Doseo Basin in Chad

doi:10.3969/j.issn.1672-7703.2024.02.007

Abstract

Abstract: In recent years, major discoveries have successively been made in Doseo Basin in Chad, and it has grown to be one of the key basins for overseas petroleum exploration of CNPC. On the basis of previous studies, the latest CNPC well drilling/completion and seismic data are used to systematically analyze the tectonic evolution characteristics and basic conditions for hydrocarbon accumulation in Doseo Basin, which support to identify the favorable exploration fields in the near future. The study results show that Doseo Basin experienced three main stages of tectonic evolution, namely the rift stage in the Early Cretaceous (deposition period of Mangara Formation), fault-depression transition in the middle stage of the Early Cretaceous (deposition period of Kedeni Formation), and depression in the late stage of the Early Cretaceous-Quaternary (deposition period of Doba Formation-Quaternary). As a result, three sets of favorable source rocks were deposited, including the Lower Cretaceous Doba Formation, Kedeni Formation and Mangara Formation. Among them, the lacustrine dark mudstone in Kedeni Formation served as the main source rock, with good organic matter type, high maturity, large thickness and wide distribution area. Multi-set reservoir-cap rock assemblages were developed in the Lower Cretaceous, and multi-type structural traps were formed influenced by multi-stage tectonic activities, developing three types of hydrocarbon accumulation combinations, including self-generation and self-storage type, lower source rock and upper reservoir type, and upper source rock and lower reservoir type. The analysis of the tectonic evolution and the controlling effect on hydrocarbon accumulation indicates that the future favorable exploration fields in Doseo Basin mainly include the northern steep slope zone, the southern gentle slope zone and new strata in the early deposited Mangara Formation.

CLC Number:

TE111.1

Ma Hong, Du Yebo, Wang Li, Wang Zhaoming, Wang Lin, Hu Jie, Gao Huahua, Wang Yuhua, Gao Simin. Tectonic evolution and the controlling effect on hydrocarbon accumulation in strike-slip basin in the Central African Rift system: a case study of Doseo Basin in Chad[J]. China Petroleum Exploration, 2024, 29(2): 83-97.

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