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Geoscience ›› 2010, Vol. 24 ›› Issue (4): 735-743.

• Water Resource and Environment • Previous Articles     Next Articles

Evolutional Impacts of Extensional Linkage Fault System in Dongpu Sag

 CHENG  Xiu-Shen1,2, CHEN  Fa-Jing1, QI  Jia-Fu3, DENG  Jun2   

  1. 1.School of Energy Resources, China University of Geosciences, Beijing100083,China;
    2.Exploration and Development Research Institute, Zhongyuan Oilfield, SINOPEC, Puyang, Henan457001,China;
    3.College of Geosciences, China University of Petroleum, Beijing102249,China
  • Online:2010-07-23 Published:2010-09-05

Abstract:

Dongpu sag NNE main basement fault extending with increasing depth intersects the deeper decoupling detachment fault and connects to the induced transfer faults in various manners,constituting the extensional linkage fault system in Dongpu sag.Linkage fault system in different sections of Dongpu sag is characterized by diverse geometrical and kinematical features. Northern Lanliao main fault plane develops a comparatively modest formation while the extensional linkage fault system is primarily composed of domino-style halfgrabens. Central extensional linkage fault system commonly exhibits an asymmetrical graben located in the hanging-wall of large listric normal fault. Southern Lanliao fault plane shows a rampflat shape, a relatively complex rift structure. The evolution of extensional linkage fault system in Dongpu sag can be roughly divided into four periods and evolutional styles, which exert significant impacts on Paleogene sedimentary and petroleum geological conditions.

Key words:  extensional linkage fault system, Lanliao fault, main basement fault, evolution; Dongpu sag

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