Oil & Gas Geology ›› 2003, Vol. 24 ›› Issue (4): 380-384.doi: 10.11743/ogg20030415

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HIGH-RESOLUTION SEQUENCE STRATIGRAPHIC FRAMEWORK OF DOLOMITE ROCKS IN BIYANG SAG:A CASE STUDY OF THE APPLICATION OF BASE LEVEL CYCLE THEORY

Cheng Zhe1, Sun Fenghua2, Lü Mingjiu2, Qin Weijun2, Wang Zhong2   

  1. 1. China University of Geosciences, Beijing;
    2. Henan Oilfield Company, SINOPEC, Nanyang, Henan
  • Received:2003-10-13 Online:2003-12-25 Published:2012-01-16

Abstract:

Based on the base level cycle theory, two long-term base level cycles,i.e.C1(the 1st sub-member of 3rd member of Eogene Hetaoyuan Formation(Eh31)—the 3rd sub-member of 2nd member of Eogene Hetaoyuan Formation(Eh23)) and C2(Eh22-Eh23),have been built up through the sequence stratigraphy analysis of 4 well-to-well correlation sections in the study area.Their boundaries might be a breakpoint where base level rises and falls. C1 cycle is vertically a sequence which water body shallows upwardly,and it can further be divided into two medium-term base level cycles,i.e.MSC1 and MSC2,corresponding to the Eh31 and Eh23 deposition. Each medium-term cycles are subdivided into smaller short-term cycles. C2 cycle is vertically not complete and is only composed of one half cycle with a fall in base level (equivalent to Eh22 and Eh21 depositional stages), which can further be divided into four medium-term base level cycles, i.e.MSC3, MSC4, MSC5 and MSC6. On the basis of the established sequence stratigraphic framework, a more detailed sequence classification will be helpful to study the microfacies of dolomite area in Biyang sag, and to predict the facies belts favorable for development of fractures and dissolved pores closely related to oil and gas accumulation.

Key words: dolomite rocks, high-resolution sequence stratigraphy, base level cycles, Biyang sag

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