Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (6): 78-87.doi: 10.3969/j.issn.1673-8926.2016.06.011

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Characteristics and evolution of the Ordovician sedimentary facies in Dongpu area, Bohai Bay Basin

Xiao Jing 1，2， Ji Hancheng 1，2， Hua Nan 1，2， Fang Chao 1，2， Li Haiquan 3， Ma Pengpeng4   

  1. 1. College of Geosciences， China University of Petroleum （Beijing）， Beijing 102249， China； 2. State key Laboratory of Petroleum Resource an Prospecting， China University of Petroleum （Beijing）， Beijing 102249， China；3. Sinopec Star-Shuangliang Geothermal Energy Phroelectricity Co.， Ltd.， Taiyuan 030006， China；4. New Energy Research Institute of Star Petroleum Co.， Ltd.， Sinopec， Beijing 100089, China
  • Received:2016-04-09 Revised:2016-06-28 Online:2016-11-10 Published:2016-11-10

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Abstract: The understanding of the Ordovician sedimentary facies distribution in Dongpu area is unclear, which restricts the hydrocarbon exploration and development. Based on the data of outcrops, cores, thin sections and logging,combined with stratigraphy, petrology, paleontology, sedimentary texture and structure, the Ordovician sedimentary facies in Dongpu area was divided into three types of subfacies （open platform, restricted platform and evaporate platform）and eleven types of microfacies. According to “single factor analysis and multi factor comprehensive mapping method”,the map of the Ordovician sedimentary microfacies was compiled. The sedimentary evolution rule was analyzed according to the sea level change and sedimentary microfacies characteristics. The open platform developed three types of sedimentary microfacies: grain banks, interbank sea and dolomitic lime flat. The restricted platform developed ten kinds of sedimentary microfacies, such as tidal flat and lagoon. The evaporate platform developed three kinds of sedimentary microfacies: dolomitic flat, lime dolomitic flat and gypseous dolomite flat. The Ordovician have experienced three and a half transgression-regression cycle from Yeli to Fengfeng period in Dongpu area. During regression period, Eli Formation and Liangjiashan Formation, the upper Majiagou Formation, the lower Fengfeng Formation and the top of upper Fengfeng Formation are composed of tidal flat and lagoon subfacies in the restricted platform and evaporation platform. During transgression period, the lower Majiagou Formation, the top of upper Majiagou Formation and the top of Fengfeng Formation are composed of the interbank sea and the small scale grain bank subfacies in open platform and the local restricted platform environment.

Key words: oil-source fault, transporting stage, peak stage of hydrocarbon generation and expulsion, time effectiveness, research method

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