Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (4): 112-120.doi: 10.12108/yxyqc.20190412

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Prediction method of channel sand body based on prestack migration in OVT domain

ZHOU Huajian   

  1. Research Institute of Exploration and Development, PetroChina Daqing Oilfield Company Ltd., Daqing 163712, Heilongjiang, China
  • Received:2018-12-17 Revised:2019-04-25 Online:2019-07-21 Published:2019-06-21

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Abstract: The Sapugao reservoir in Saertu oilfield,Daqing Placanticline,is a typical clastic fluvial-delta deposit with thin interbed of sandstone and shale,and frequent sand-mud interbedding. Conventional poststack seismic reservoir prediction method can only predict some relatively thick channel sand bodies with low accuracy,and well-seismic combined with reservoir description technology is not conducive to the comprehensive application of Sapugao reservoir in Placanticline oilfield. Taking advantage of high-density seismic data from Saertu oilfield, the processing of prestack seismic data in OVT domain was carried out,and two parameters of offset and azimuth were retained in the data volume. By means of seismic sedimentology,the amplitude attributes of stratal slices in different directions reflecting the characteristics of reservoir sand bodies were analyzed. The thin interbedded channel sand bodies were predicted according to the geomorphological characteristics of the study area, and the prediction accuracy of channel sand bodies was further improved by combining well and seismic data more than 15%. This method provides an effective means to guide the description and tapping of interwell residual oil in Placanticline oilfield. with reservoir description. Compared with conventional seismic data,the prediction accuracy was improved by more than 15%. This method provides an effective means to guide the description and tapping of interwell residual oil in Placanticline oilfield.

Key words: OVT domain, offset, azimuth angle, thin interbed, reservoir prediction, channel sand body

CLC Number: 

  • P631
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