Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (6): 156-164.doi: 10.12108/yxyqc.20210616

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Identification of metamorphite lithology in paleo buried hill by compositionstructure classification: A case study from Archean in Bohai Sea

YE Tao1,2, NIU Chengmin1, WANG Qingbin1, GAO Kunshun1, SUN Zhe1, CHEN Anqing2   

  1. 1. Tianjin Branch of CNOOC Ltd., Tianjin 300459, China;
    2. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
  • Received:2021-03-25 Revised:2021-06-02 Online:2021-12-01 Published:2021-11-25

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Abstract: The lithology of metamorphic buried hill plays an important role in controlling reservoir development. In order to identify lithology of metamorphic buried hill effectively, the well-logging identification methods based on component-structure classification of metamorphite were studied with the data of boreholes in Bohai Sea. The results show that migmatization and intrusion of intermediate basic magma are the main controlling factors for the complex lithologic association of Archean, which control the formation of femic intrusion and the felsic metamorphite, and the migmatization makes the metamorphic granite more complex. Based on mineral and element analysis and core observation, the division scheme of four components and three structures was established, and the classification scheme of Archean well logging geology in Bohai Sea area was established. Based on this scheme, the identification chart of logging intersection for different lithologies were constructed, and the conventional logging and imaging logging identification methods for rock structure were established. The identification result is consistent with the geological understanding through the back judgment of coring well. This method provides a new thinking for identification of metamorphite.

Key words: lithology identification, logging-geology classification, buried hill, Archean, Bohai Sea

CLC Number: 

  • TE122.2
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