Lithologic Reservoirs ›› 2008, Vol. 20 ›› Issue (4): 14-19.doi: 10.3969/j.issn.1673-8926.2008.04.003

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Sequence stratigraphy framework and lithologic reservoirs prediction of the third and fourth members of Shahejie Formation，Damintun Depression

FENG Youliang   

  1. Research Institute of Petroleum Exploration and Development， PetroChina， Beijing 100083， China
  • Online:2008-12-15 Published:2008-12-15

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Abstract:

By using high resolution 3D seismic data, log curves and logging data, high resolution stratigraphy frameworks of the third and fourth members of Shahejie Formation in Damintun Depression are established in order to recognize sequence system tract characteristics. The sy s tem tracts of Sha 3 and Sha 4 members are controlled by synsedimentary faulting. LST delta distributes below the synsedimentary faulting slope break, while fluvial delta and fan delta mainly develope in HST. In lake expanding system tract, deep lake mudstone and oil shale distribute below the slope break, shallow lake sediments distribute above the slope break. LST sand bodies of SSq3-1 and SSq2-1 sequences controlled by synsedimentary faulting slope break spread under the high quality source rocks, just being in the overpressured zones of Sha 3 and Sha 4 members, which is favorable for the lithologic reservoirs formation. The LST sand bodies of SSq2-1 sequence in west slope zone and SSq2-1 and SSq3-1 sequences in Rongshengpu Sag are most favorable for lithologic reservoirs forming.

Key words: Chang 6 reservoir, secondary porosity, pore structure, Ordos Basin

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