Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (2): 336-347.doi: 10.13278/j.cnki.jjuese.201602103

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High-Resolution Sequence Stratigraphy Division of Yanchang Formation in Southwestern Ordos Basin

Tan Cong1, Yu Bingsong1, Ruan Zhuang1, Liu Ce2, Zhu Xi3, Xie Haochen1, Luo Zhong2   

  1. 1. School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;
    2. China Institute of Petroleum Exploration & Development, Beijing 100083, China;
    3. Liaoning Chemical Geology Prospecting Institute, Jinzhou 121011, Liaoning China
  • Received:2015-07-19 Published:2016-03-26
  • Supported by:

    Support by National Oil and Gas special Project(2011ZX05005-004-HZ06, 2011ZX05009-002)

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Abstract:

Based on the high-resolution sequence stratigraphy and sedimentology theory, in combination with the data of Ruishuihe outcrop profile, 42 drilling cores, and hundreds of well logging, the authors studied the high-resolution sequence stratigraphy of Yanchang Formation in the southwestern Ordos basin. The results show that Yanchang Formation can be divided into 4 large-scale cycles, and 11 intermediate-scale cycles. The highest base level of the four large-scale cycles are basically corresponded to Chang 9, Chang 7, Chang 4+5, and Chang 1 respectively. According to the study, three kinds of main cyclical structures of Yanchang Formation in the southwestern Ordos basin are proposed, include asymmetry form deepening upwards when A/S<1 symmetric form when A/S≈1, and asymmetry form of descending half cycle when A/S>1. With the analysis of the NS and EW framework of high-resolution sequence chronostratigraphy, there is no sedimentary discontinuity and unconformity within Yanchang Formation, however the top strata of Yanchang Formation were denuded to different extent, among which the southwest part was denuded seriously, and the middle and northwest strata were preserved well, and both of them contacted with the overlying Jurassic strata unconformably.

Key words: Ordos basin, Yanchang Formation, high-resolution sequence stratigraphy, base level cycle

CLC Number: 

  • P618.13

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