Structural analysis and its petroleum significance of detachment faults in Baiyun Sag,Pearl River Mouth Basin

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  • CNOOC Research Institute,Beijing 100028,China

Received date: 2017-06-09

  Revised date: 2017-08-01

  Online published: 2017-10-10

Abstract

The Baiyun Sag is an acknowledged hydrocarbon generating sag with the advantageous geological condition in the deep-water area of the northern South China Sea.There are different conclusions on structural geology,sedimentary fillings and dynamic mechanism in previous research.In recent years,the high quality seismic data collected in Baiyun Sag provide us an opportunity to recognize the seismic reflecting horizons and structure characteristics,and study in the sedimentary fillings and structural evolution.As a consequence,Baiyun Sag is chosen as an application example of detachment faulting in uniform lithosphere deformation.On the basis of 3D seismic data,we determined the detachment faults,established the theoretical model,and finally pointed out the influence of structural evolution on petroleum exploration.Owing to the special tectonic position,landward dipping detachment faults were developed in Baiyun Sag as a ductile deformation area in continent-ocean transition between South China plate and South China Sea.11 control faults could be recognized as the detachment faults.And the structural evolution and sedimentary fillings might be controlled by the deformation activities of these detachment faults.The evolution history of Baiyun Sag included three stages,i.e.,detachment faulting stage,faulting depression stage and regional subsidence stage.The detachment faulting and the sustaining regional subsidence lead Baiyun Sag to be the largest and deepest basin in deep-water area of northern South China Sea,and controlled the distribution of main source rocks in Wenchnag Formation and Enping Formation.

Cite this article

Ji Mo,Yang Hai-zhang,Zeng Qing-bo,Zhao Zhao,Wang Long-Ying,Sun Yu-hao . Structural analysis and its petroleum significance of detachment faults in Baiyun Sag,Pearl River Mouth Basin[J]. Natural Gas Geoscience, 2017 , 28(10) : 1506 -1514 . DOI: 10.11764/j.issn.1672-1926.2017.08.005

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