Oil & Gas Geology ›› 2012, Vol. 33 ›› Issue (6): 909-913.doi: 10.11743/ogg20120612

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Application of seismic data to the design of horizontal well trajectory in tight sandstone gas reservoirs

Xu Jie, Dong Ning, Zhu Chenghong, Liu Junzhou, Chen Tiansheng   

  1. Exploration & Production Research Institute, SINOPEC, Beijing 100083, China
  • Received:2011-09-05 Revised:2012-09-25 Online:2012-12-28 Published:2013-01-10

Abstract:

The 1st member of Permian Xiashihezi Formation (He-1) in Daniudi gas field,Ordos Basin,is braided channel deposits with large thickness.As heterogeneity of the gas layer distribution is strong,development of the gas reservoirs with horizontal wells is difficult.In order to increase the success rate of drilling"sweet spot"in this tight sandstone layer,we studied in detail the sedimentary facies and characteristics of the braided channel deposits in He-1 based on analyses of high resolution sequence stratigraphy and sedimentary system,and presented methods to integrate various seismic data into design of horizontal well trajectory,such as 3D seismic interpretation,waveform analysis,AVO gas detection and geo-statistical inversion.Among these seismic data,negative AVO gradient and geo-statistics inversion are the most important and can provide strong technical support to the development of the tight sand gas reservoirs with horizontal wells in Dajiudi gas field.The integration of sequence stratigraphy theory with geophysical prediction methods is an effective way to improve the success rate of "sweet spot"drilling in tight gas sandstone reservoirs.

Key words: seismic waveform, negative AVO gradient, geo-statistic inversion, sequence stratigraphy, horizontal well, Daniudi gas field, Ordos Basin

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