中非裂谷系走滑盆地构造演化及其控油作用——以乍得Doseo盆地为例

doi:10.3969/j.issn.1672-7703.2024.02.007

摘要/Abstract

摘要： 近年来，乍得Doseo盆地油气勘探相继获得重要发现，已成为中国石油海外油气勘探的重点盆地之一。文章在前人研究的基础上，利用中国石油在Doseo盆地的最新钻完井和地震资料，对Doseo盆地构造演化特征和油气成藏的基本条件进行系统分析，明确了下一步有利勘探领域。Doseo盆地主要经历了早白垩世早期断陷期（Mangara组沉积期）、早白垩世中期断坳过渡期（Kedeni组沉积期）、早白垩世晚期—第四纪坳陷期（Doba组沉积期—第四纪）3个演化阶段，发育了下白垩统Doba组、Kedeni组和Mangara组3套有利烃源岩，其中以Kedeni组湖相暗色泥岩为主力烃源岩，其有机质类型好、成熟度高，厚度大，分布广。盆地发育下白垩统多套储盖组合，受多期构造活动影响，构造圈闭类型多样，形成自生自储、下生上储及上生下储3类成藏组合。通过对盆地构造演化及其对油气控制作用分析，认为Doseo盆地下步有利勘探领域主要是盆地北部陡坡带和南部缓坡带及盆地早期沉积的Mangara组新层系。

关键词: Doseo盆地, 下白垩统, 构造演化, 成藏条件, 成藏模式, 勘探潜力

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.

中图分类号:

TE111.1

马洪, 杜业波, 王利, 王兆明, 王林, 胡杰, 高华华, 王玉华, 高思敏. 中非裂谷系走滑盆地构造演化及其控油作用——以乍得Doseo盆地为例[J]. 中国石油勘探, 2024, 29(2): 83-97.

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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