Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (3): 60-69.doi: 10.12108/yxyqc.20220306

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Genesis and logging response characteristics of formation overpressure of Paleogene in Bozhong Sag，Bohai Bay Basin

HE Yu, ZHOU Xing, LI Shaoxuan, DING Hongbo   

  1. Tianjin Branch of CNOOC Ltd., Tianjin 300452, China
  • Received:2021-07-29 Revised:2021-09-05 Online:2022-05-01 Published:2022-05-12

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Abstract: Based on pressure measurement and logging data of Paleogene in Bozhong Sag，Bohai Bay Basin， the formation pressure curves of the whole well section were established，and the vertical overpressure zones were divided. The genesis and types of overpressure were analyzed by the consideration of vertical effective stress-velocity cross plot，source rock development and vitrinite reflectance，and the method for identifying overpressure was improved. The results show that： （1）Abnormal overpressure developed in the lower second member of Dongying Formation and the third member of Shahejie Formation of Paleogene in Bozhong Sag. The genesis of overpressure is mainly undercompaction，hydrocarbon generation of organic matter and fluid conduction， with the aging of the strata，the overpressure genesis changes from undercompaction to non-undercompaction such as hydrocarbon generation of organic matter and fluid conduction.（2）The overpressure caused by undercompaction generally corresponds to thick mudstone section，with little change of acoustic velocity，low rock density and stable vertical effective stress. The overpressure caused by hydrocarbon generation of organic matter corresponds to the strata with acoustic velocity being lower than that of normal compacted strata，but it increases slightly with the increase of depth，and the vertical effective stress is low. The overpressure caused by fluid conduction generally occurs in overpressure fluid compartments without the conditions for self-source overpressure generation，the acoustic velocity and rock density show normal compaction trend，and the measured pressure increases linearly with depth in the longitudinal direction， showing the same pressure system.

Key words: undercompaction overpressure, overpressure caused by hydrocarbon generation of organic matter, fluid conduction overpressure, genesis of formation overpressure, logging response characteristics, Paleogene, Bozhong Sag, Bohai Bay Basin

CLC Number: 

  • TE122
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