Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (2): 90-94.doi: 10.3969/j.issn.1673-8926.2011.02.017

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Sedimentary facies prediction of braided channel of the third member of Shihezi Formation in Daniudi Gasfield, Ordos Basin

XU Jie， DONG Ning， NING Junrui， ZHANG Yonggui， ZHOU Xiaoying， SHE Gang   

  1. Research Institute of Petroleum Exploration & Production， Sinopec， Beijing 100083， China
  • Online:2011-04-20 Published:2011-04-20

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Abstract:

The reservoirs of the third member of Permian Shihezi Formation in Daniudi Gasfield in Ordos Basin are braided channel sediment. The reservoir prediction of channel sand is uncertain because of seismic resolution and overlying sandstone of upper Shihezi Formation. Under the constraint of high resolution sequence stratigraphic framework, and based on the comprehensive analysis of synthetic seismogram and seismic reflection characteristics, it is recognized that there are four geologic implications of seismic reflected wave T9 f at the top surface of the third member of Shihezi Formation. The waveform seismic facies analysis method combining with comprehensive study on seismic facies, electrofacies and sedimentary facies are applied to predict the sedimentary microfacies distribution of braided channel and favorable areas for channel sand development. The prediction result has a consistent rate of 90% with the actual data in D66 well field. So the waveformseismic facies constrained by sedimentary facies and sediment features can be used to accurately predict the complex geologic body.

Key words: interwell seismic, wave field characteristics, forward numerical simulation, wave field separation, elastic wave equation

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