Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (3): 95-103.doi: 10.12108/yxyqc.20210309

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

New method for sequence division of platform facies carbonate rocks: A case study of Ordovician in Bozhong Sag

YE Tao, WANG Qingbin, DAI Liming, CHEN Rongtao, CUI Puyuan   

  1. Tianjin Branch of CNOOC, Tianjin 300459, China
  • Received:2020-01-09 Revised:2020-09-29 Online:2021-06-01 Published:2021-06-03

Abstract: The traditional sequence division method based on natural gamma ray is not applicable in shallow platform,due to that the high gamma ray in mud flat corresponds to shallow water sedimentary environment. Taking Ordovician Majiagou Formation in Bozhong 21-22 structure of Bohai Sea as an example,a new sequence division method based on natural gamma-ray spectral logging was proposed,and the control of sequence on reservoir was discussed. The result shows that: (1)Weathering,uranium enrichment of reservoir and normal sedimentary shale can cause high gamma of Ordovician Majiagou Formation in Bozhong 21-22 structure.(2)In natural gammaray spectrum logging,Th/K can effectively distinguish high gamma with different genesis,which is an effective parameter for sequence division.(2)There are five third-order sequences developed in Ordovician Majiagou Formation in Bozhong 21-22 structure. The sequence in well BZ21-2-A is complete,while SQ5 is lacked in well BZ22-1-B. The corresponding relationship between sequences and reservoir shows that the fractured reservoirs are mainly distributed within 100 m of weathering crust and are not obviously controlled by the sequence boundary.While dissolved pore reservoirs are mainly concentrated near the top and bottom of SQ1-SQ2 sequence and are obviously controlled by the sequence boundary. The research results can be used for reference in the sequence division of carbonate rocks in platform facies.

Key words: sequence division, natural gamma-ray spectrum, reservoir distribution, carbonate rocks of platform facies, Ordovician, Bozhong Sag

CLC Number: 

  • TE122.2
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