Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (2): 104-115.doi: 10.12108/yxyqc.20210211

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Tectonic evolution and formation mechanism of Davie Fracture Zone in East Africa coast

QIN Yangliang1,2, HE Youbin1,2, CAI Jun1,2, LI Hua1,2, ZHANG Can3, LIU Jianning1,2   

  1. 1. College of Geoscience, Yangtze University, Wuhan 430100, China;
    2. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan 430100, China;
    3. Hebei Zaoqiang Middle School, Hengshui 053100, Hebei, China
  • Received:2020-07-01 Revised:2020-09-18 Online:2021-04-01 Published:2021-03-31

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Abstract: The north-south-trend length of Davie Fracture Zone along the East African coast was comprehensive analyzed based on East African coast topography,free air gravity anomalies and magnetic anomalies. The structural characteristics of different parts of Davie Fracture Zone were clarified through fine interpretation of seismic data. The structural characteristics of the Davie Fracture Zone in different periods were analyzed by means of layer flattening,growth index and balanced profile,combined with regional dynamic analysis. The results show that the horizontal distribution of Davie Fracture Zone is between 4°S and 22°S from north to south. The vertical struture has different characteristics of north-south segmentation,and structural ridges can be seen in the southern section,accompanied by typical undercut structures,and in the northern section,positive inverted structures can be seen. Affected by the differential activities of the plates in the East African coast,the Davie Fracture Zone has different characteristics in different periods. In Late Carboniferous to Early Jurassic,the Davie Fracture Zone was mainly affected by tensile stress,and typical graben structures can be seen in the flattened seismic section. During the Middle Jurassic-Early Cretaceous,it turned into strike-slip property due to the southward drift of Madagascar. Since the Late Cretaceous,it entered the passive continental margin stage,and the Davie East Fault basically ceased its activity,while the Davie West Fault continued to be active. The development and evolution of the Davie Fracture Zone is inherited,and its north-south structural difference is the result of the combined effect of heat conduction and plate stress transition. Thus,a tectonic deformation model of "continuous activity of the southern structural ridge and local compression after the northern expansion" was established. The above conclusions could make a contribution for the study of oil and gas geology of the Davie Fracture Zone.

Key words: segmented differential deformation, tectonic evolution, formation mechanism, Davie Fracture Zone, East African coast

CLC Number: 

  • TE121.2
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