Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (4): 30-37.doi: 10.3969/j.issn.1673-8926.2017.04.004

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Characteristics of sequence stratigraphy of the Lower Triassic Feixianguan Formation in Dachuan-Wanxian area,northeastern Sichuan Basin

SUN Chunyan1,2,3, HU Mingyi1,2,3, HU Zhonggui1,2,3   

  1. 1. Research Center of Sedimentary Basin, Yangtze University, Wuhan 430100, China;
    2. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan 430100, China;
    3. School of Geosciences, Yangtze University, Wuhan 430100, China
  • Received:2016-11-06 Revised:2017-02-15 Online:2017-07-21 Published:2017-07-21

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Abstract: In order to clarify the development, evolution and distribution of oolitic beach reservoir and dolomite reservoir of the Lower Triassic Feixianguan Formation in Dachuan-Wanxian area, based on the theory of Vail sequence stratigraphy, combined with sequence boundary markers, such as the exposed surface, lithological mutation and sequence unconformity surface, the sequence of the typical single well was divided. According to the change of relative sea level rising and falling, the Feixianguan Formation can be divided into two third-order sequences(Sq1 and Sq2)and four system tracts. Sq1 consists of the first and second members of Feixianguan For-mation, and Sq2 consists of the third and fourth members of Feixianguan Formation. Both Sq1 and Sq2 are made up of transgressive and highstand systems tracts, lacking of the lowstand systems tract. The sequence stratigraphic framework of this area was established by comparing the sequence stratigraphic sections of the cross facies zone. The results show that each systems tract in the region can be comparative, platform margin oolitic facies and intraplatform oolitic facies developed in the late period of highstand systems tract, and the strong dolomitization improved the porosity and permeability. Under the condition of deep burial, the primary pore of dolomite is easy to be preserved, and it has a certain anti-compaction and anti-pressure solution, which lays a foundation for the formation of high quality reservoir. The result has important geological significance for further exploration in Sichuan Basin.

Key words: astrostratigraphy, cyclostratigraphy, orbit parameters, climate substitute index, (sub)Milankovitch cycle, shale gas

CLC Number: 

  • TE121.3+4
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