Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (1): 154-164.doi: 10.13278/j.cnki.jjuese.20180144

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Structure Types and Its Geological Significance of Eastern Edge of Xihu Sag in the East China Sea Shelf Basin

Gong Xinghui, Chen Linlin, Li Kun, Xiao Jiannan   

  1. Institute of Exploration and Development, SINOPEC Offshore Oil & Gas Company, Shanghai 200120, China
  • Received:2018-06-05 Published:2019-01-18
  • Supported by:
    Supported by Science and Technology Project of SINOPEC(P170113)and National Marine Geology Special Project of China(DD20160147)

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Abstract: The GH-1 profile through the Well XH-1 revealed the structural changes of basin edge during the Cenozoic basin evolution of the eastern Xihu sag in the East China Sea shelf basin. On the basis of combing with the standpoints of previous research on basin prototype, and reviewing the continuously eastward expansion super points of T25, T24 and T23, the evolution characteristics of leapfrog and cyclic development for continental basins are confirmed. Referring to the two tectonic inversions of T24 and T20, two second-order tectonic sequences are recognized in the intracontinental migration depression period as Oligocene and Miocene(Longjing Formation and Yuquan Formation). Based on the genetic mechanism of Liulang Formation, the attribution of Liulang Formation in the basin development history is discussed. Through the mechanism discussion of the Yuquan, Huagang and Longjing movements and confirmation of their interfaces, the understanding of the east basin edge in fault depression during depression period is deepened:Xihu sag experienced the iterative development of the archetypal basin from strive slip tensional depression to conversion edge depression in Paleocene-Eocene,intracontinental migration depression in Oligocene-Miocene, and retro-arc continental shelf margin depression in Pliocene-Quaternary.

Key words: edge structure, eastern edge, Xihu sag, East China Sea shelf basin

CLC Number: 

  • P618.13
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