Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (5): 1322-1331.doi: 10.13278/j.cnki.jjuese.201505106

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Sedimentary Characteristics and Reef-Forming Model of Changxing Formation in Panlongdong Section of Xuanhan,Sichuan

Li Qiufen1, Miao Shunde2, Jiang Qingchun1, Wang Tongshan1, Xu Anna1, Zhai Xiufen1   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    2. CNOOC Research Institute, Beijing 100027, China
  • Received:2015-01-12 Published:2015-09-26

Abstract:

Based on the multidisciplinary analysis of outcrop and microfacies observation, the sedimentary characteristics and forming model of Changxing Formation reef are researched in detail in Panlongdong Section. The reef is located in the platform margin of Exi-Chengkou trough. It is a huge platform marginal reef deposition during aggradation-progradation in a background of relative sea-level fall. The reef is full of outcrops. Sponge skeleton reef limestone and sponge skeleton reef dolomite are the main rocks. According to the sedimentary facies' characteristics, Panlongdong region belongs to a carbonate platform marginal sedimentary system, and can be divided into slope facies, platform marginal reef, and platform marginal bio-clast bank. The platform marginal reef facies can be divided into reef base, reef core, reef cap, fore reef, and back reef. Panlongdong reef consists of three depositional cycles: the first cycle of reef was formed in a low energy environment which was drown without sufficient growth; the second cycle of reef was formed in a relative high energy environment which died of exposure after experiencing sufficient growth with weak dolomitization on the top; and the third cycle of reef was formed in a high energy environment which died of exposure after experiencing sufficient growth, and then the reef formed a bio-clast bank, and later was destroyed by waves and tides. The reef and bio-clast bank experienced an intensive dolomitization after a long-term exposure.

Key words: Changxing Formation, reefs, sedimentary characteristics, reef-forming model

CLC Number: 

  • P539

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