海洋地质前沿2026，Vol.42Issue(5)：37-46,10.DOI:10.16028/j.1009-2722.2025.173
北部湾盆地迈陈凹陷断裂发育特征及控藏作用
Characteristics of fault development and their control on hydrocarbon accumulation in the Maichen Sag,Beibu Gulf Basin
摘要
Abstract
To address the complexity of the fault system and the hydrocarbon accumulation mechanism in the Maichen Sag of the Beibu Gulf Basin,we systematically investigated the fault development characteristics and tectonic evolution patterns using seismic data,drilling data,and balanced cross-section analysis.Results indicate that the sag is primarily characterized by extensional structures and an extensional-strike-slip composite structural style,where the"cabbage-like"structural pattern of the central fault-uplift belt controls the composite hydrocar-bon accumulation.The fault system exhibits layered characteristics in evolution:the lower fault system in NE-trending that formed during the Paleocene-Eocene,controlled the deposition of the Changliu and Liushagang Formations,whereas the upper fault system in near E-W direction,which developed during the Oligocene,gov-erned the deposition of the Weizhou Formation.The tectonic evolution underwent four stages:initial rifting(NW-SE extension),intense rifting(NNW-SSE extension),late rifting(near N-S extension),and a subsequent sagging stage.Clockwise rotation of the stress field led to the changes in fault orientation.Variations in fault activity in-tensity control the distribution of source rocks,reservoir body types,and hydrocarbon migration pathways.This study provided a geological basis for exploring slope fault-block traps in the western high zone of the sag.关键词
构造样式/构造演化/断裂活动性/油气成藏/迈陈凹陷/北部湾盆地Key words
structural style/tectonic evolution/fault activity/hydrocarbon accumulation/Maichen Sag/Beibu Gulf Basin分类
海洋科学引用本文复制引用
郭雨梦,郭新安,刘晋华,郭廷超..北部湾盆地迈陈凹陷断裂发育特征及控藏作用[J].海洋地质前沿,2026,42(5):37-46,10.基金项目
中国石化科技部项目(P24137) （P24137）
