Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (3): 115-121.doi: 10.12108/yxyqc.20200311

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Macro-correction method and application of seismic pseudo-well velocity point: a case study from M gas field in Pearl River Mouth Basin

LUO Ze, XIE Mingying, LIANG Jie, TU Zhiyong, HOU Kai   

  1. Shenzhen Branch of CNOOC Ltd., Shenzhen 518000, Guangdong, China
  • Received:2019-09-16 Revised:2019-11-13 Online:2020-05-21 Published:2020-04-30

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Abstract: In seismic exploration and development,the selection of velocity research method is the key to timedepth conversion. In view of the complexity of fault system in M gas field of Pearl River Mouth Basin,the transverse velocity variation is obvious due to the influence of faults on the main part of structure,while the error of depth structure map obtained by previous time-depth conversion methods,such as variable velocity mapping or well-time-depth relationship fitting,is obvious. It is too large to meet the needs of high-precision structural research in the development stage. The traditional variable speed mapping method was improved. The optimized pseudo-well velocity point macro-correction method is to use the difference between pseudo-well velocity time function and logging velocity time function to correct the seismic velocity,which combines the advantages of high vertical resolution of wells and high lateral resolution of earthquakes better. It can improve work efficiency and reduce structural uncertainty at the same time. The actual drilling results show that the macro-correction method of pseudo-well velocity points effectively improves the accuracy of time-depth conversion in this area.

Key words: time-depth conversion, variable speed mapping, macro-correction of pseudo-well velocity point, Pearl River Mouth Basin

CLC Number: 

  • TE122.2
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