Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (4): 991-1005.doi: 10.13278/j.cnki.jjuese.20200189

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Characteristic of Sequence Stratigraphic Framework and Its Controls on Reservoir: A Case Study of Lower-Paleozoic Carbonate in Southwest Area of Bohai Sea

Ye Tao1,2, Wang Qingbin1, Huang Zhi1, Sun Zhe1, Li Fei1, Chen Anqing2   

  1. 1. Tianjin Branch of China National Offshore Oil Company Ltd., Tianjin 300452, China;
    2. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
  • Received:2020-08-20 Online:2021-07-26 Published:2021-08-02
  • Supported by:
    Supported by the National Science and Technology Major Project of China (2016ZX05024-003)

Abstract: Based on the data of seismic, drilling, cores, and thin sections, the characteristics of the sequential stratigraphic framework and its controls on the Lower-Paleozoic karst reservoirs in southwest of Bohai Sea area were discussed. The results show that:1) There are negative carbon and oxygen isotopic anomalies and positive Th/K anomalies in the natural gamma spectrum near the third-order sequence boundary, and according to these characteristics the Lower Paleozoic is divided into 21 third-order sequences; 2) The dolomite is the most important reservoir rocks in the study area, and the sequences control the development of the high quality reservoir by controlling the change of vertical lithology; 3) The twelve third-order sequences where dolomite developed are defined as "dominant reservoir sequences", which control the scale of buried-hill reservoir and also the capacity of the production when coupled with the weathering interfaces of Caledonian movement. Inner-reservoirs are developed in the Cambrian with dissolved pores as the main spaces, and are also strictly controlled by the "dominant reservoir sequences". In future exploration, priority should be given to drilling in the areas where the "dominant reservoir sequences" coupled with weathering interfaces, while taking inner-reservoirs into account.

Key words: southwest area of Bohai Sea, Lower-Paleozoic, carbonate buried-hill, sequence framework, karst reservoir

CLC Number: 

  • TE122.2
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