新疆石油地质

新疆石油地质 ›› 2016, Vol. 37 ›› Issue (zk(English) ): 96-99.

• APPLICATION OF TECHNOLOGY • 上一篇    下一篇

Reason Analysis and Solution for Log-Seismic Data Discrepancy in 3D Seismic Area:A Case Study of Well Xidi-2 3D Seismic Area in Beisantai Swell, Junggar Basin

WEN Tiemin, LUO Xiaoxia, WU Xinxing, LI Daoshan, LI Longmei   

  1. Research Institute of Geology, BGP, CNPC, Zhuozhou, Hebei 072750, China
  • 出版日期:2017-01-01 发布日期:2021-05-24
  • 作者简介:WEN Tiemin,E-mail:wentiemin@cnpc.com.cn

Reason Analysis and Solution for Log-Seismic Data Discrepancy in 3D Seismic Area:A Case Study of Well Xidi-2 3D Seismic Area in Beisantai Swell, Junggar Basin

WEN Tiemin, LUO Xiaoxia, WU Xinxing, LI Daoshan, LI Longmei   

  1. Research Institute of Geology, BGP, CNPC, Zhuozhou, Hebei 072750, China
  • Online:2017-01-01 Published:2021-05-24
  • About author:WEN Tiemin,E-mail:wentiemin@cnpc.com.cn

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摘要： The study of 3D prestack time migration profile of Well Xidi-2 indicates that the time domain profile of the Wutonggou formation as a target zone in drilled well with higher structural position has a bigger t0 compared with well logging data. Such a log-seismic discrepancy occurs from the bottom of Paleogene in this area. The analysis suggests that it is mainly resulted from the lateral velocity changes of the Cenozoic here. Prestack depth migration processing technique is an effective approach for precise imaging of complex structures. This paper uses Kirchhoff integral method to make prestack depth migration processing, and gets the south-north reducing velocity model for the space variation in this area. Finally, the morphology of formation has been corrected, the relative relationship between wells has been recovered, and the problem of the log-seismic data discrepancy has been resolved.

关键词: Junggar basin, log-seismic data discrepancy, time profile, Kirchhoff integral method, prestack depth migration, velocity model

Abstract: The study of 3D prestack time migration profile of Well Xidi-2 indicates that the time domain profile of the Wutonggou formation as a target zone in drilled well with higher structural position has a bigger t0 compared with well logging data. Such a log-seismic discrepancy occurs from the bottom of Paleogene in this area. The analysis suggests that it is mainly resulted from the lateral velocity changes of the Cenozoic here. Prestack depth migration processing technique is an effective approach for precise imaging of complex structures. This paper uses Kirchhoff integral method to make prestack depth migration processing, and gets the south-north reducing velocity model for the space variation in this area. Finally, the morphology of formation has been corrected, the relative relationship between wells has been recovered, and the problem of the log-seismic data discrepancy has been resolved.

Key words: Junggar basin, log-seismic data discrepancy, time profile, Kirchhoff integral method, prestack depth migration, velocity model