Oil & Gas Geology ›› 2009, Vol. 30 ›› Issue (1): 116-121.doi: 10.11743/ogg20090117

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Prediction of dolomite reservoirs for the Cambrian buried hills in the Yaha fault structural belt,the Tarim Basin

Cui Haifeng1,2, Zhang Nianchun2, Zheng Duoming3, Teng Tuanyu2   

  1. 1. Chengdu University of Technology, Chengdou, Sichuan 610059, China;
    2. Northwest Branch of PetroChina Exploration & Development Research Institute, Lanzhou, Gansu 730020, China;
    3. Research Institute of Exploration & Development, PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China
  • Received:2008-09-08 Online:2009-02-25 Published:2012-01-16

Abstract:

Severely eroded Cambrian buried hill in the Yaha fault structural belt of Tarim Basin consists of the Upper,the Middle,and the Lower Cambrian dolomites.The Cambrian buried hill reservoirs are mainly distributed in the weathering crust and have a thickness of less than 100 m.They as a whole belong to fractured-vuggy reservoirs,with the characteristics of relatively small pores,fractures and vuggies,undistinguished seismic responses and strong lateral heterogeneity.The results of model-based reservoir inversion can not reveal the real lateral distribution of buried hill reservoirs,but that of seismic attribute-based reservoir prediction with amplitude-preserved 3D seismic pure wave data are more reliable.According to the analysis of seismic attribute coherence,RMS amplitude,reflection strength slope and arc length attributes were selected to perform a multi-seismic cluster analysis.The results show that the dolomite reservoirs in the Cambrian buried hills mainly occur in the structural high and nor-thern slope area and are in patchy distribution.These predictions are consistent with the drilling results.

Key words: seismic attribute, buried hill, reservoir prediction, Yaha fault zone, Tarim Basin

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